Stockfish 2.2.1

Hopefully fixed the "lose on time" issue.

stockfish bench signature is: 5457475

Signed-off-by: Marco Costalba <mcostalba@gmail.com>

Readme.txt

@@ -1,22 +1,20 @@
 1. Introduction
 ---------------
 
-Stockfish is a free UCI chess engine derived from Glaurung 2.1. It is
-not a complete chess program, but requires some UCI compatible GUI
-(like XBoard with PolyGlot, eboard, Jos<6F>, Arena, Sigma Chess, Shredder,
-Chess Partner, or Fritz) in order to be used comfortably.  Read the
-documentation for your GUI of choice for information about how to use
-Stockfish with your GUI.
+Stockfish is a free UCI chess engine derived from Glaurung 2.1. It is not a
+complete chess program, but requires some UCI compatible GUI (like XBoard
+with PolyGlot, eboard, Arena, Sigma Chess, Shredder, Chess Partner or Fritz)
+in order to be used comfortably. Read the documentation for your GUI of choice
+for information about how to use Stockfish with your GUI.
 
-This version of Stockfish supports up to 8 CPUs, but has not been
-tested thoroughly with more than 2.  The program tries to detect the
-number of CPUs on your computer and set the number of search threads
-accordingly, but please be aware that the detection is not always
-correct.  It is therefore recommended to inspect the value of the
-"Threads" UCI parameter, and to make sure it equals the number of CPU
-cores on your computer. If you are using more than four threads, it
-is recommended to raise the value of "Minimum Split Depth" UCI parameter
-to 6.
+This version of Stockfish supports up to 32 CPUs, but has not been tested
+thoroughly with more than 4.  The program tries to detect the number of
+CPUs on your computer and set the number of search threads accordingly, but
+please be aware that the detection is not always correct. It is therefore
+recommended to inspect the value of the "Threads" UCI parameter, and to
+make sure it equals the number of CPU cores on your computer. If you are
+using more than eight threads, it is recommended to raise the value of
+"Min Split Depth" UCI parameter to 7.
 
 
 2. Files
@@ -30,9 +28,9 @@ This distribution of Stockfish consists of the following files:
     License.
 
   * src/, a subdirectory containing the full source code, including a
-    Makefile that can be used to compile Stockfish on Unix-like
-    systems.  For further information about how to compile Stockfish
-    yourself, read section 4 below.
+    Makefile that can be used to compile Stockfish on Unix-like systems.
+    For further information about how to compile Stockfish yourself
+    read section 4 below.
 
   * polyglot.ini, for using Stockfish with Fabien Letouzey's PolyGlot
     adapter.
@@ -41,35 +39,32 @@ This distribution of Stockfish consists of the following files:
 3. Opening books
 ----------------
 
-This version of Stockfish has experimental support for PolyGlot opening
-books. For information about how to create such books, consult the
-PolyGlot documentation.  The book file can be selected by setting the
-UCI parameter "Book File".
+This version of Stockfish has support for PolyGlot opening books.
+For information about how to create such books, consult the PolyGlot
+documentation.  The book file can be selected by setting the UCI
+parameter "Book File".
 
 
 4. Compiling it yourself
 ------------------------
 
-On Unix-like systems, it should usually be possible to compile
-Stockfish directly from the source code with the included Makefile.
+On Unix-like systems, it should usually be possible to compile Stockfish
+directly from the source code with the included Makefile.
 
-For big-endian machines like Power PC you need to enable the proper
-flag changing from -DNBIGENDIAN to -DBIGENDIAN in the Makefile.
+Stockfish has support for 32 or 64 bits CPUS, big-endian machines, like
+Power PC, hardware POPCNT instruction and other platforms.
 
-Stockfish has POPCNT instruction runtime detection and support. This can
-give an extra speed on Core i7 or similar systems. To enable this feature
-compile with 'make icc-profile-popcnt'
-
-On 64 bit Unix-like systems the 'bsfq' assembly instruction will be used
-for bit counting. Detection is automatic at compile time, but in case you
-experience compile problems you can comment out #define USE_BSFQ line in types.h
+In general is recommended to run 'make help' to see a list of make targets
+with corresponding descriptions. When not using Makefile to compile, for
+instance with Microsoft MSVC, you need to manually set/unset in the compiler
+command line some swicthes, see file types.h for a quick reference.
 
 
 5. Terms of use
 ---------------
 
 Stockfish is free, and distributed under the GNU General Public License
-(GPL).  Essentially, this means that you are free to do almost exactly
+(GPL). Essentially, this means that you are free to do almost exactly
 what you want with the program, including distributing it among your
 friends, making it available for download from your web site, selling
 it (either by itself or as part of some bigger software package), or
@@ -77,14 +72,8 @@ using it as the starting point for a software project of your own.
 
 The only real limitation is that whenever you distribute Stockfish in
 some way, you must always include the full source code, or a pointer
-to where the source code can be found.  If you make any changes to the
+to where the source code can be found. If you make any changes to the
 source code, these changes must also be made available under the GPL.
 
 For full details, read the copy of the GPL found in the file named
 Copying.txt.
-
-
-6. Feedback
------------
-
-The author's e-mail address is mcostalba@gmail.com

polyglot.ini

@@ -15,34 +15,29 @@ ResignScore = 600
 
 [Engine]
 
-Hash = 128
-Threads = 1
-OwnBook = false
-Book File = book.bin
-Best Book Move = false
 Use Search Log = false
 Search Log Filename = SearchLog.txt
+Book File = book.bin
+Best Book Move = false
 Mobility (Middle Game) = 100
 Mobility (Endgame) = 100
-Pawn Structure (Middle Game) = 100
-Pawn Structure (Endgame) = 100
 Passed Pawns (Middle Game) = 100
 Passed Pawns (Endgame) = 100
 Space = 100
 Aggressiveness = 100
 Cowardice = 100
-Check Extension (PV nodes) = 2
-Check Extension (non-PV nodes) = 1
-Single Reply Extension (PV nodes) = 2
-Single Reply Extension (non-PV nodes) = 2
-Mate Threat Extension (PV nodes) = 0
-Mate Threat Extension (non-PV nodes) = 0
-Pawn Push to 7th Extension (PV nodes) = 1
-Pawn Push to 7th Extension (non-PV nodes) = 1
-Passed Pawn Extension (PV nodes) = 1
-Passed Pawn Extension (non-PV nodes) = 0
-Pawn Endgame Extension (PV nodes) = 2
-Pawn Endgame Extension (non-PV nodes) = 2
-Randomness = 0
-Minimum Split Depth = 4
-Maximum Number of Threads per Split Point = 5
+Min Split Depth = 4
+Max Threads per Split Point = 5
+Threads = 1
+Use Sleeping Threads = false
+Hash = 128
+Ponder = true
+OwnBook = false
+MultiPV = 1
+Skill Level = 20
+Emergency Move Horizon = 40
+Emergency Base Time = 200
+Emergency Move Time = 70
+Minimum Thinking Time = 20
+UCI_Chess960 = false
+UCI_AnalyseMode = false

src/COPYING

@@ -1,674 +0,0 @@
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src/Makefile

@@ -1,8 +1,6 @@
 # Stockfish, a UCI chess playing engine derived from Glaurung 2.1
 # Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-# Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-#
-# This file is part of Stockfish.
+# Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 #
 # Stockfish is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License as published by
@@ -33,11 +31,9 @@ BINDIR = $(PREFIX)/bin
 PGOBENCH = ./$(EXE) bench 32 1 10 default depth
 
 ### Object files
-OBJS = application.o bitboard.o pawns.o material.o endgame.o evaluate.o main.o \
-	misc.o move.o movegen.o history.o movepick.o search.o piece.o \
-	position.o direction.o tt.o value.o uci.o ucioption.o \
-	mersenne.o book.o bitbase.o san.o benchmark.o
-
+OBJS = benchmark.o bitbase.o bitboard.o book.o endgame.o evaluate.o main.o \
+	material.o misc.o move.o movegen.o movepick.o pawns.o position.o \
+	search.o thread.o timeman.o tt.o uci.o ucioption.o
 
 ### ==========================================================================
 ### Section 2. High-level Configuration
@@ -46,16 +42,16 @@ OBJS = application.o bitboard.o pawns.o material.o endgame.o evaluate.o main.o \
 # flag                --- Comp switch --- Description
 # ----------------------------------------------------------------------------
 #
-# debug = no/yes      --- -DNDEBUG    --- Enable/Disable debug mode
+# debug = yes/no      --- -DNDEBUG         --- Enable/Disable debug mode
 # optimize = yes/no   --- (-O3/-fast etc.) --- Enable/Disable optimizations
-# arch = (name)       --- (-arch)     --- Target architecture
-# os = (name)         ---             --- Target operating system
-# bits = 64/32        --- -DIS_64BIT  --- 64-/32-bit operating system
-# bigendian = no/yes  --- -DBIGENDIAN --- big/little-endian byte order
-# prefetch = no/yes   --- -DUSE_PREFETCH  --- Use prefetch x86 asm-instruction
-# bsfq = no/yes       --- -DUSE_BSFQ  --- Use bsfq x86_64 asm-instruction
-#                                     --- (Works only with GCC and ICC 64-bit)
-# popcnt = no/yes     --- -DUSE_POPCNT --- Use popcnt x86_64 asm-instruction
+# arch = (name)       --- (-arch)          --- Target architecture
+# os = (name)         ---                  --- Target operating system
+# bits = 64/32        --- -DIS_64BIT       --- 64-/32-bit operating system
+# bigendian = yes/no  --- -DBIGENDIAN      --- big/little-endian byte order
+# prefetch = yes/no   --- -DUSE_PREFETCH   --- Use prefetch x86 asm-instruction
+# bsfq = yes/no       --- -DUSE_BSFQ       --- Use bsfq x86_64 asm-instruction (only
+#                                              with GCC and ICC 64-bit)
+# popcnt = yes/no     --- -DUSE_POPCNT     --- Use popcnt x86_64 asm-instruction
 #
 # Note that Makefile is space sensitive, so when adding new architectures
 # or modifying existing flags, you have to make sure there are no extra spaces
@@ -200,6 +196,15 @@ ifeq ($(COMP),)
 	COMP=gcc
 endif
 
+ifeq ($(COMP),mingw)
+	comp=mingw
+	CXX=g++
+	profile_prepare = gcc-profile-prepare
+	profile_make = gcc-profile-make
+	profile_use = gcc-profile-use
+	profile_clean = gcc-profile-clean
+endif
+
 ifeq ($(COMP),gcc)
 	comp=gcc
 	CXX=g++
@@ -219,10 +224,18 @@ ifeq ($(COMP),icc)
 endif
 
 ### 3.2 General compiler settings
-CXXFLAGS += -g -Wall -fno-exceptions -fno-rtti $(EXTRACXXFLAGS)
+CXXFLAGS = -g -Wall -Wcast-qual -fno-exceptions -fno-rtti $(EXTRACXXFLAGS)
+
+ifeq ($(comp),gcc)
+	CXXFLAGS += -ansi -pedantic -Wno-long-long -Wextra -Wshadow
+endif
+
+ifeq ($(comp),mingw)
+	CXXFLAGS += -Wextra -Wshadow
+endif
 
 ifeq ($(comp),icc)
-	CXXFLAGS += -wd383,869,981,10187,10188,11505,11503
+	CXXFLAGS += -wd383,981,1418,1419,10187,10188,11505,11503 -Wcheck -Wabi -Wdeprecated -strict-ansi
 endif
 
 ifeq ($(os),osx)
@@ -230,7 +243,7 @@ ifeq ($(os),osx)
 endif
 
 ### 3.3 General linker settings
-LDFLAGS += -lpthread $(EXTRALDFLAGS)
+LDFLAGS = -lpthread $(EXTRALDFLAGS)
 
 ifeq ($(os),osx)
 	LDFLAGS += -arch $(arch)
@@ -257,11 +270,15 @@ ifeq ($(optimize),yes)
 		endif
 	endif
 
-	ifeq ($(comp),icc)
-		CXXFLAGS += -fast
+	ifeq ($(comp),mingw)
+		CXXFLAGS += -O3
+	endif
 
+	ifeq ($(comp),icc)
 		ifeq ($(os),osx)
-			CXXFLAGS += -mdynamic-no-pic
+			CXXFLAGS += -fast -mdynamic-no-pic
+		else
+			CXXFLAGS += -O3
 		endif
 	endif
 endif
@@ -291,16 +308,25 @@ endif
 
 ### 3.10 popcnt
 ifeq ($(popcnt),yes)
-	CXXFLAGS += -DUSE_POPCNT
+	CXXFLAGS += -msse3 -DUSE_POPCNT
+endif
+
+### 3.11 Link Time Optimization, it works since gcc 4.5 but not on mingw.
+### This is a mix of compile and link time options because the lto link phase
+### needs access to the optimization flags.
+ifeq ($(comp),gcc)
+	GCC_MAJOR := `gcc -dumpversion | cut -f1 -d.`
+	GCC_MINOR := `gcc -dumpversion | cut -f2 -d.`
+	ifeq (1,$(shell expr \( $(GCC_MAJOR) \> 4 \) \| \( $(GCC_MAJOR) \= 4 \& $(GCC_MINOR) \>= 5 \)))
+		CXXFLAGS += -flto
+		LDFLAGS += $(CXXFLAGS)
+	endif
 endif
 
 ### ==========================================================================
 ### Section 4. Public targets
 ### ==========================================================================
 
-default:
-	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) build
-
 help:
 	@echo ""
 	@echo "To compile stockfish, type: "
@@ -311,7 +337,7 @@ help:
 	@echo ""
 	@echo "build                > Build unoptimized version"
 	@echo "profile-build        > Build PGO-optimized version"
-	@echo "popcnt-profile-build > Build PGO-optimized version with optional popcnt-support"
+	@echo "double-profile-build > Build PGO-optimized version with and without popcnt support"
 	@echo "strip                > Strip executable"
 	@echo "install              > Install executable"
 	@echo "clean                > Clean up"
@@ -320,7 +346,7 @@ help:
 	@echo "Supported archs:"
 	@echo ""
 	@echo "x86-64               > x86 64-bit"
-	@echo "x86-64-modern        > x86 64-bit with runtime support for popcnt-instruction"
+	@echo "x86-64-modern        > x86 64-bit with runtime support for popcnt instruction"
 	@echo "x86-32               > x86 32-bit excluding very old hardware without SSE-support"
 	@echo "x86-32-old           > x86 32-bit including also very old hardware"
 	@echo "osx-ppc-64           > PPC-Mac OS X 64 bit"
@@ -336,6 +362,7 @@ help:
 	@echo ""
 	@echo "gcc                  > Gnu compiler (default)"
 	@echo "icc                  > Intel compiler"
+	@echo "mingw                > Gnu compiler with MinGW under Windows"
 	@echo ""
 	@echo "Non-standard targets:"
 	@echo ""
@@ -371,7 +398,7 @@ profile-build:
 	@echo "Step 4/4. Deleting profile data ..."
 	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) $(profile_clean)
 
-popcnt-profile-build:
+double-profile-build:
 	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) config-sanity
 	@echo ""
 	@echo "Step 0/6. Preparing for profile build."
@@ -408,11 +435,14 @@ install:
 	-strip $(BINDIR)/$(EXE)
 
 clean:
-	$(RM) $(EXE) *.o .depend *~ core bench.txt
+	$(RM) $(EXE) $(EXE).exe *.o .depend *~ core bench.txt *.gcda
 
 testrun:
 	@$(PGOBENCH)
 
+default:
+	help
+
 ### ==========================================================================
 ### Section 5. Private targets
 ### ==========================================================================
@@ -449,7 +479,7 @@ config-sanity:
 	@test "$(prefetch)" = "yes" || test "$(prefetch)" = "no"
 	@test "$(bsfq)" = "yes" || test "$(bsfq)" = "no"
 	@test "$(popcnt)" = "yes" || test "$(popcnt)" = "no"
-	@test "$(comp)" = "gcc" || test "$(comp)" = "icc"
+	@test "$(comp)" = "gcc" || test "$(comp)" = "icc" || test "$(comp)" = "mingw"
 
 $(EXE): $(OBJS)
 	$(CXX) -o $@ $(OBJS) $(LDFLAGS)
@@ -466,6 +496,7 @@ gcc-profile-make:
 gcc-profile-use:
 	$(MAKE) ARCH=$(ARCH) COMP=$(COMP) \
 	EXTRACXXFLAGS='-fprofile-use' \
+	EXTRALDFLAGS='-lgcov' \
 	all
 
 gcc-profile-clean:
@@ -500,7 +531,7 @@ icc-profile-clean:
 
 hpux:
 	$(MAKE) \
-	CXX='/opt/aCC/bin/aCC -AA +hpxstd98 -DBIGENDIAN -mt +O3 -DNDEBUG' \
+	CXX='/opt/aCC/bin/aCC -AA +hpxstd98 -DBIGENDIAN -mt +O3 -DNDEBUG -DNO_PREFETCH' \
 	CXXFLAGS="" \
 	LDFLAGS="" \
 	all

src/application.cpp

@@ -1,78 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include "bitboard.h"
-#include "direction.h"
-#include "endgame.h"
-#include "evaluate.h"
-#include "material.h"
-#include "mersenne.h"
-#include "misc.h"
-#include "movepick.h"
-#include "position.h"
-#include "search.h"
-#include "thread.h"
-#include "ucioption.h"
-
-
-/// Application class is in charge of initializing global resources
-/// at startup and cleanly releases them when program terminates.
-
-Application::Application() {
-
-    init_mersenne();
-    init_direction_table();
-    init_bitboards();
-    init_uci_options();
-    Position::init_zobrist();
-    Position::init_piece_square_tables();
-    init_eval(1);
-    init_bitbases();
-    init_search();
-    init_threads();
-
-    // Make random number generation less deterministic, for book moves
-    for (int i = abs(get_system_time() % 10000); i > 0; i--)
-        genrand_int32();
-}
-
-void Application::initialize() {
-
-  // A static Application object is allocated
-  // once only when this function is called.
-  static Application singleton;
-}
-
-void Application::free_resources() {
-
-  // Warning, following functions reference global objects that
-  // must be still alive when free_resources() is called.
-  exit_threads();
-  quit_eval();
-}
-
-void Application::exit_with_failure() {
-
-  exit(EXIT_FAILURE);
-}

src/benchmark.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,29 +17,23 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
 #include <fstream>
-#include <sstream>
+#include <iostream>
 #include <vector>
 
-#include "benchmark.h"
+#include "misc.h"
+#include "position.h"
 #include "search.h"
 #include "thread.h"
 #include "ucioption.h"
 
 using namespace std;
+using namespace Search;
 
-////
-//// Variables
-////
-
-const string BenchmarkPositions[] = {
+static const char* Defaults[] = {
   "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1",
-  "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq -",
-  "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - -",
+  "r3k2r/p1ppqpb1/bn2pnp1/3PN3/1p2P3/2N2Q1p/PPPBBPPP/R3K2R w KQkq - 0 10",
+  "8/2p5/3p4/KP5r/1R3p1k/8/4P1P1/8 w - - 0 11",
   "4rrk1/pp1n3p/3q2pQ/2p1pb2/2PP4/2P3N1/P2B2PP/4RRK1 b - - 7 19",
   "rq3rk1/ppp2ppp/1bnpb3/3N2B1/3NP3/7P/PPPQ1PP1/2KR3R w - - 7 14",
   "r1bq1r1k/1pp1n1pp/1p1p4/4p2Q/4Pp2/1BNP4/PPP2PPP/3R1RK1 w - - 2 14",
@@ -51,136 +45,91 @@ const string BenchmarkPositions[] = {
   "r1bq1r1k/b1p1npp1/p2p3p/1p6/3PP3/1B2NN2/PP3PPP/R2Q1RK1 w - - 1 16",
   "3r1rk1/p5pp/bpp1pp2/8/q1PP1P2/b3P3/P2NQRPP/1R2B1K1 b - - 6 22",
   "r1q2rk1/2p1bppp/2Pp4/p6b/Q1PNp3/4B3/PP1R1PPP/2K4R w - - 2 18",
-  "4k2r/1pb2ppp/1p2p3/1R1p4/3P4/2r1PN2/P4PPP/1R4K1 b  - 3 22",
+  "4k2r/1pb2ppp/1p2p3/1R1p4/3P4/2r1PN2/P4PPP/1R4K1 b - - 3 22",
   "3q2k1/pb3p1p/4pbp1/2r5/PpN2N2/1P2P2P/5PP1/Q2R2K1 b - - 4 26"
 };
 
 
-////
-//// Functions
-////
-
 /// benchmark() runs a simple benchmark by letting Stockfish analyze a set
-/// of positions for a given time each.  There are four parameters; the
+/// of positions for a given limit each. There are five parameters; the
 /// transposition table size, the number of search threads that should
-/// be used, the time in seconds spent for each position (optional, default
-/// is 60) and an optional file name where to look for positions in fen
-/// format (default are the BenchmarkPositions defined above).
-/// The analysis is written to a file named bench.txt.
+/// be used, the limit value spent for each position (optional, default is
+/// depth 12), an optional file name where to look for positions in fen
+/// format (defaults are the positions defined above) and the type of the
+/// limit value: depth (default), time in secs or number of nodes.
 
-void benchmark(const string& commandLine) {
+void benchmark(int argc, char* argv[]) {
 
-  istringstream csVal(commandLine);
-  istringstream csStr(commandLine);
-  string ttSize, threads, fileName, limitType, timFile;
-  int val, secsPerPos, maxDepth, maxNodes;
+  vector<string> fens;
+  LimitsType limits;
+  int time;
+  int64_t nodes = 0;
 
-  csStr >> ttSize;
-  csVal >> val;
-  if (val < 4 || val > 1024)
-  {
-      cerr << "The hash table size must be between 4 and 1024" << endl;
-      Application::exit_with_failure();
-  }
-  csStr >> threads;
-  csVal >> val;
-  if (val < 1 || val > MAX_THREADS)
-  {
-      cerr << "The number of threads must be between 1 and " << MAX_THREADS << endl;
-      Application::exit_with_failure();
-  }
-  set_option_value("Hash", ttSize);
-  set_option_value("Threads", threads);
-  set_option_value("OwnBook", "false");
-  set_option_value("Use Search Log", "true");
-  set_option_value("Search Log Filename", "bench.txt");
+  // Assign default values to missing arguments
+  string ttSize  = argc > 2 ? argv[2] : "128";
+  string threads = argc > 3 ? argv[3] : "1";
+  string valStr  = argc > 4 ? argv[4] : "12";
+  string fenFile = argc > 5 ? argv[5] : "default";
+  string valType = argc > 6 ? argv[6] : "depth";
 
-  csVal >> val;
-  csVal >> fileName;
-  csVal >> limitType;
-  csVal >> timFile;
+  Options["Hash"]    = ttSize;
+  Options["Threads"] = threads;
+  Options["OwnBook"] = false;
 
-  secsPerPos = maxDepth = maxNodes = 0;
+  if (valType == "time")
+      limits.maxTime = 1000 * atoi(valStr.c_str()); // maxTime is in ms
+
+  else if (valType == "nodes")
+      limits.maxNodes = atoi(valStr.c_str());
 
-  if (limitType == "time")
-      secsPerPos = val * 1000;
-  else if (limitType == "depth" || limitType == "perft")
-      maxDepth = val;
   else
-      maxNodes = val;
+      limits.maxDepth = atoi(valStr.c_str());
 
-  vector<string> positions;
-
-  if (fileName != "default")
+  if (fenFile != "default")
   {
-      ifstream fenFile(fileName.c_str());
-      if (!fenFile.is_open())
-      {
-          cerr << "Unable to open positions file " << fileName << endl;
-          Application::exit_with_failure();
-      }
-      string pos;
-      while (fenFile.good())
-      {
-          getline(fenFile, pos);
-          if (!pos.empty())
-              positions.push_back(pos);
-      }
-      fenFile.close();
-  } else
-      for (int i = 0; i < 16; i++)
-          positions.push_back(string(BenchmarkPositions[i]));
+      string fen;
+      ifstream file(fenFile.c_str());
 
-  ofstream timingFile;
-  if (!timFile.empty())
-  {
-      timingFile.open(timFile.c_str(), ios::out | ios::app);
-      if (!timingFile.is_open())
+      if (!file.is_open())
       {
-          cerr << "Unable to open timing file " << timFile << endl;
-          Application::exit_with_failure();
+          cerr << "Unable to open file " << fenFile << endl;
+          exit(EXIT_FAILURE);
+      }
+
+      while (getline(file, fen))
+          if (!fen.empty())
+              fens.push_back(fen);
+
+      file.close();
+  }
+  else
+      fens.assign(Defaults, Defaults + 16);
+
+  time = system_time();
+
+  for (size_t i = 0; i < fens.size(); i++)
+  {
+      Position pos(fens[i], false, 0);
+
+      cerr << "\nPosition: " << i + 1 << '/' << fens.size() << endl;
+
+      if (valType == "perft")
+      {
+          int64_t cnt = perft(pos, limits.maxDepth * ONE_PLY);
+          cerr << "\nPerft " << limits.maxDepth  << " leaf nodes: " << cnt << endl;
+          nodes += cnt;
+      }
+      else
+      {
+          Threads.start_thinking(pos, limits, vector<Move>(), false);
+          nodes += RootPosition.nodes_searched();
       }
   }
 
-  vector<string>::iterator it;
-  int cnt = 1;
-  int64_t totalNodes = 0;
-  int startTime = get_system_time();
+  time = system_time() - time;
 
-  for (it = positions.begin(); it != positions.end(); ++it, ++cnt)
-  {
-      Move moves[1] = {MOVE_NONE};
-      int dummy[2] = {0, 0};
-      Position pos(*it, 0);
-      cerr << "\nBench position: " << cnt << '/' << positions.size() << endl << endl;
-      if (limitType == "perft")
-      {
-          int64_t perftCnt = perft(pos, maxDepth * OnePly);
-          cerr << "\nPerft " << maxDepth << " result (nodes searched): " << perftCnt << endl << endl;
-          totalNodes += perftCnt;
-      } else {
-          if (!think(pos, false, false, 0, dummy, dummy, 0, maxDepth, maxNodes, secsPerPos, moves))
-              break;
-          totalNodes += nodes_searched();
-      }
-  }
-
-  cnt = get_system_time() - startTime;
-  cerr << "==============================="
-       << "\nTotal time (ms) : " << cnt
-       << "\nNodes searched  : " << totalNodes
-       << "\nNodes/second    : " << (int)(totalNodes/(cnt/1000.0)) << endl << endl;
-
-  if (!timFile.empty())
-  {
-      timingFile << cnt << endl << endl;
-      timingFile.close();
-  }
-
-  // Under MS Visual C++ debug window always unconditionally closes
-  // when program exits, this is bad because we want to read results before.
-  #if (defined(WINDOWS) || defined(WIN32) || defined(WIN64))
-  cerr << "Press any key to exit" << endl;
-  cin >> fileName;
-  #endif
+  cerr << "\n==========================="
+       << "\nTotal time (ms) : " << time
+       << "\nNodes searched  : " << nodes
+       << "\nNodes/second    : " << int(nodes / (time / 1000.0)) << endl;
 }

src/benchmark.h

@@ -1,37 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(BENCHMARK_H_INCLUDED)
-#define BENCHMARK_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include <string>
-
-
-////
-//// Prototypes
-////
-
-extern void benchmark(const std::string& commandLine);
-
-#endif // !defined(BENCHMARK_H_INCLUDED)

src/bitbase.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,22 +17,10 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
 #include <cassert>
 
-#include "bitbase.h"
 #include "bitboard.h"
-#include "move.h"
-#include "square.h"
-
-
-////
-//// Local definitions
-////
+#include "types.h"
 
 namespace {
 
@@ -40,311 +28,244 @@ namespace {
     RESULT_UNKNOWN,
     RESULT_INVALID,
     RESULT_WIN,
-    RESULT_LOSS,
     RESULT_DRAW
   };
 
   struct KPKPosition {
+    Result classify_knowns(int index);
+    Result classify(int index, Result db[]);
+
+  private:
     void from_index(int index);
-    int to_index() const;
-    bool is_legal() const;
-    bool is_immediate_draw() const;
-    bool is_immediate_win() const;
-    Bitboard wk_attacks() const;
-    Bitboard bk_attacks() const;
-    Bitboard pawn_attacks() const;
+    Result classify_white(const Result db[]);
+    Result classify_black(const Result db[]);
+    Bitboard wk_attacks()   const { return StepAttacksBB[W_KING][whiteKingSquare]; }
+    Bitboard bk_attacks()   const { return StepAttacksBB[B_KING][blackKingSquare]; }
+    Bitboard pawn_attacks() const { return StepAttacksBB[W_PAWN][pawnSquare]; }
 
     Square whiteKingSquare, blackKingSquare, pawnSquare;
     Color sideToMove;
   };
 
+  // The possible pawns squares are 24, the first 4 files and ranks from 2 to 7
+  const int IndexMax = 2 * 24 * 64 * 64; // color * wp_sq * wk_sq * bk_sq = 196608
 
-  Result *Bitbase;
-  const int IndexMax = 2*24*64*64;
-  int UnknownCount = 0;
-
-  void initialize();
-  bool next_iteration();
-  Result classify_wtm(const KPKPosition &p);
-  Result classify_btm(const KPKPosition &p);
-  int compute_index(Square wksq, Square bksq, Square psq, Color stm);
-  int compress_result(Result r);
+  // Each uint32_t stores results of 32 positions, one per bit
+  uint32_t KPKBitbase[IndexMax / 32];
 
+  int compute_index(Square wksq, Square bksq, Square wpsq, Color stm);
 }
 
 
-////
-//// Functions
-////
+uint32_t probe_kpk_bitbase(Square wksq, Square wpsq, Square bksq, Color stm) {
 
-void generate_kpk_bitbase(uint8_t bitbase[]) {
-  // Allocate array and initialize:
-  Bitbase = new Result[IndexMax];
-  initialize();
+  int index = compute_index(wksq, bksq, wpsq, stm);
 
-  // Iterate until all positions are classified:
-  while(next_iteration());
+  return KPKBitbase[index / 32] & (1 << (index & 31));
+}
 
-  // Compress bitbase into the supplied parameter:
-  int i, j, b;
-  for(i = 0; i < 24576; i++) {
-    for(b = 0, j = 0; j < 8; b |= (compress_result(Bitbase[8*i+j]) << j), j++);
-    assert(b == int(uint8_t(b)));
-    bitbase[i] = (uint8_t)b;
-  }
 
-  // Release allocated memory:
-  delete [] Bitbase;
+void kpk_bitbase_init() {
+
+  Result db[IndexMax];
+  KPKPosition pos;
+  int index, bit, repeat = 1;
+
+  // Initialize table
+  for (index = 0; index < IndexMax; index++)
+      db[index] = pos.classify_knowns(index);
+
+  // Iterate until all positions are classified (30 cycles needed)
+  while (repeat)
+      for (repeat = index = 0; index < IndexMax; index++)
+          if (   db[index] == RESULT_UNKNOWN
+              && pos.classify(index, db) != RESULT_UNKNOWN)
+              repeat = 1;
+
+  // Map 32 position results into one KPKBitbase[] entry
+  for (index = 0; index < IndexMax / 32; index++)
+      for (bit = 0; bit < 32; bit++)
+          if (db[32 * index + bit] == RESULT_WIN)
+              KPKBitbase[index] |= (1 << bit);
 }
 
 
 namespace {
 
+  // A KPK bitbase index is an integer in [0, IndexMax] range
+  //
+  // Information is mapped in this way
+  //
+  // bit     0: side to move (WHITE or BLACK)
+  // bit  1- 6: black king square (from SQ_A1 to SQ_H8)
+  // bit  7-12: white king square (from SQ_A1 to SQ_H8)
+  // bit 13-14: white pawn file (from FILE_A to FILE_D)
+  // bit 15-17: white pawn rank - 1 (from RANK_2 - 1 to RANK_7 - 1)
+
+  int compute_index(Square wksq, Square bksq, Square wpsq, Color stm) {
+
+    assert(file_of(wpsq) <= FILE_D);
+
+    int p = file_of(wpsq) + 4 * (rank_of(wpsq) - 1);
+    int r = stm + 2 * bksq + 128 * wksq + 8192 * p;
+
+    assert(r >= 0 && r < IndexMax);
+
+    return r;
+  }
+
   void KPKPosition::from_index(int index) {
-    int s;
-    sideToMove = Color(index % 2);
-    blackKingSquare = Square((index / 2) % 64);
-    whiteKingSquare = Square((index / 128) % 64);
-    s = (index / 8192) % 24;
-    pawnSquare = make_square(File(s % 4), Rank(s / 4 + 1));
+
+    int s = index >> 13;
+    sideToMove = Color(index & 1);
+    blackKingSquare = Square((index >> 1) & 63);
+    whiteKingSquare = Square((index >> 7) & 63);
+    pawnSquare = make_square(File(s & 3), Rank((s >> 2) + 1));
   }
 
+  Result KPKPosition::classify_knowns(int index) {
 
-  int KPKPosition::to_index() const {
-    return compute_index(whiteKingSquare, blackKingSquare, pawnSquare,
-                         sideToMove);
+    from_index(index);
+
+    // Check if two pieces are on the same square
+    if (   whiteKingSquare == pawnSquare
+        || whiteKingSquare == blackKingSquare
+        || blackKingSquare == pawnSquare)
+        return RESULT_INVALID;
+
+    // Check if a king can be captured
+    if (    bit_is_set(wk_attacks(), blackKingSquare)
+        || (bit_is_set(pawn_attacks(), blackKingSquare) && sideToMove == WHITE))
+        return RESULT_INVALID;
+
+    // The position is an immediate win if it is white to move and the
+    // white pawn can be promoted without getting captured.
+    if (   rank_of(pawnSquare) == RANK_7
+        && sideToMove == WHITE
+        && whiteKingSquare != pawnSquare + DELTA_N
+        && (   square_distance(blackKingSquare, pawnSquare + DELTA_N) > 1
+            || bit_is_set(wk_attacks(), pawnSquare + DELTA_N)))
+        return RESULT_WIN;
+
+    // Check for known draw positions
+    //
+    // Case 1: Stalemate
+    if (   sideToMove == BLACK
+        && !(bk_attacks() & ~(wk_attacks() | pawn_attacks())))
+        return RESULT_DRAW;
+
+    // Case 2: King can capture pawn
+    if (   sideToMove == BLACK
+        && bit_is_set(bk_attacks(), pawnSquare) && !bit_is_set(wk_attacks(), pawnSquare))
+        return RESULT_DRAW;
+
+    // Case 3: Black king in front of white pawn
+    if (   blackKingSquare == pawnSquare + DELTA_N
+        && rank_of(pawnSquare) < RANK_7)
+        return RESULT_DRAW;
+
+    //  Case 4: White king in front of pawn and black has opposition
+    if (   whiteKingSquare == pawnSquare + DELTA_N
+        && blackKingSquare == pawnSquare + DELTA_N + DELTA_N + DELTA_N
+        && rank_of(pawnSquare) < RANK_5
+        && sideToMove == WHITE)
+        return RESULT_DRAW;
+
+    // Case 5: Stalemate with rook pawn
+    if (   blackKingSquare == SQ_A8
+        && file_of(pawnSquare) == FILE_A)
+        return RESULT_DRAW;
+
+    return RESULT_UNKNOWN;
   }
 
+  Result KPKPosition::classify(int index, Result db[]) {
 
-  bool KPKPosition::is_legal() const {
-    if(whiteKingSquare == pawnSquare || whiteKingSquare == blackKingSquare ||
-       pawnSquare == blackKingSquare)
-      return false;
-    if(sideToMove == WHITE) {
-      if(bit_is_set(this->wk_attacks(), blackKingSquare))
-        return false;
-      if(bit_is_set(this->pawn_attacks(), blackKingSquare))
-        return false;
-    }
-    else {
-      if(bit_is_set(this->bk_attacks(), whiteKingSquare))
-        return false;
-    }
-    return true;
+    from_index(index);
+    db[index] = (sideToMove == WHITE ? classify_white(db) : classify_black(db));
+    return db[index];
   }
 
+  Result KPKPosition::classify_white(const Result db[]) {
 
-  bool KPKPosition::is_immediate_draw() const {
-    if(sideToMove == BLACK) {
-      Bitboard wka = this->wk_attacks();
-      Bitboard bka = this->bk_attacks();
-
-      // Case 1: Stalemate
-      if((bka & ~(wka | this->pawn_attacks())) == EmptyBoardBB)
-        return true;
-
-      // Case 2: King can capture pawn
-      if(bit_is_set(bka, pawnSquare) && !bit_is_set(wka, pawnSquare))
-        return true;
-    }
-    else {
-      // Case 1: Stalemate
-      if(whiteKingSquare == SQ_A8 && pawnSquare == SQ_A7 &&
-         (blackKingSquare == SQ_C7 || blackKingSquare == SQ_C8))
-        return true;
-    }
-
-    return false;
-  }
-
-
-  bool KPKPosition::is_immediate_win() const {
-    // The position is an immediate win if it is white to move and the white
-    // pawn can be promoted without getting captured:
-    return
-      sideToMove == WHITE &&
-      square_rank(pawnSquare) == RANK_7 &&
-      (square_distance(blackKingSquare, pawnSquare+DELTA_N) > 1 ||
-       bit_is_set(this->wk_attacks(), pawnSquare+DELTA_N));
-  }
-
-
-  Bitboard KPKPosition::wk_attacks() const {
-    return StepAttackBB[WK][whiteKingSquare];
-  }
-
-
-  Bitboard KPKPosition::bk_attacks() const {
-    return StepAttackBB[BK][blackKingSquare];
-  }
-
-
-  Bitboard KPKPosition::pawn_attacks() const {
-    return StepAttackBB[WP][pawnSquare];
-  }
-
-
-  void initialize() {
-    KPKPosition p;
-    for(int i = 0; i < IndexMax; i++) {
-      p.from_index(i);
-      if(!p.is_legal())
-        Bitbase[i] = RESULT_INVALID;
-      else if(p.is_immediate_draw())
-        Bitbase[i] = RESULT_DRAW;
-      else if(p.is_immediate_win())
-        Bitbase[i] = RESULT_WIN;
-      else {
-        Bitbase[i] = RESULT_UNKNOWN;
-        UnknownCount++;
-      }
-    }
-  }
-
-
-  bool next_iteration() {
-    KPKPosition p;
-    int previousUnknownCount = UnknownCount;
-
-    for(int i = 0; i < IndexMax; i++)
-      if(Bitbase[i] == RESULT_UNKNOWN) {
-        p.from_index(i);
-
-        Bitbase[i] = (p.sideToMove == WHITE)? classify_wtm(p) : classify_btm(p);
-
-        if(Bitbase[i] == RESULT_WIN || Bitbase[i] == RESULT_LOSS ||
-           Bitbase[i] == RESULT_DRAW)
-          UnknownCount--;
-      }
-
-    return UnknownCount != previousUnknownCount;
-  }
-
-
-  Result classify_wtm(const KPKPosition &p) {
-
-    // If one move leads to a position classified as RESULT_LOSS, the result
-    // of the current position is RESULT_WIN.  If all moves lead to positions
-    // classified as RESULT_DRAW, the current position is classified as
-    // RESULT_DRAW.  Otherwise, the current position is classified as
-    // RESULT_UNKNOWN.
+    // If one move leads to a position classified as RESULT_WIN, the result
+    // of the current position is RESULT_WIN. If all moves lead to positions
+    // classified as RESULT_DRAW, the current position is classified RESULT_DRAW
+    // otherwise the current position is classified as RESULT_UNKNOWN.
 
     bool unknownFound = false;
     Bitboard b;
     Square s;
+    Result r;
 
     // King moves
-    b = p.wk_attacks();
-    while(b) {
-      s = pop_1st_bit(&b);
-      switch(Bitbase[compute_index(s, p.blackKingSquare, p.pawnSquare,
-                                   BLACK)]) {
-      case RESULT_LOSS:
-        return RESULT_WIN;
+    b = wk_attacks();
+    while (b)
+    {
+        s = pop_1st_bit(&b);
+        r = db[compute_index(s, blackKingSquare, pawnSquare, BLACK)];
 
-      case RESULT_UNKNOWN:
-        unknownFound = true;
-        break;
+        if (r == RESULT_WIN)
+            return RESULT_WIN;
 
-      case RESULT_DRAW: case RESULT_INVALID:
-        break;
-
-      default:
-        assert(false);
-      }
+        if (r == RESULT_UNKNOWN)
+            unknownFound = true;
     }
 
     // Pawn moves
-    if(square_rank(p.pawnSquare) < RANK_7) {
-      s = p.pawnSquare + DELTA_N;
-      switch(Bitbase[compute_index(p.whiteKingSquare, p.blackKingSquare, s,
-                                   BLACK)]) {
-      case RESULT_LOSS:
-        return RESULT_WIN;
+    if (rank_of(pawnSquare) < RANK_7)
+    {
+        s = pawnSquare + DELTA_N;
+        r = db[compute_index(whiteKingSquare, blackKingSquare, s, BLACK)];
 
-      case RESULT_UNKNOWN:
-        unknownFound = true;
-        break;
+        if (r == RESULT_WIN)
+            return RESULT_WIN;
 
-      case RESULT_DRAW: case RESULT_INVALID:
-        break;
+        if (r == RESULT_UNKNOWN)
+            unknownFound = true;
 
-      default:
-        assert(false);
-      }
+        // Double pawn push
+        if (rank_of(s) == RANK_3 && r != RESULT_INVALID)
+        {
+            s += DELTA_N;
+            r = db[compute_index(whiteKingSquare, blackKingSquare, s, BLACK)];
 
-      if(square_rank(s) == RANK_3 &&
-         s != p.whiteKingSquare && s != p.blackKingSquare) {
-        s += DELTA_N;
-        switch(Bitbase[compute_index(p.whiteKingSquare, p.blackKingSquare, s,
-                                     BLACK)]) {
-        case RESULT_LOSS:
-          return RESULT_WIN;
+            if (r == RESULT_WIN)
+                return RESULT_WIN;
 
-        case RESULT_UNKNOWN:
-          unknownFound = true;
-          break;
-
-        case RESULT_DRAW: case RESULT_INVALID:
-          break;
-
-        default:
-          assert(false);
+            if (r == RESULT_UNKNOWN)
+                unknownFound = true;
         }
-      }
     }
-
-    return unknownFound? RESULT_UNKNOWN : RESULT_DRAW;
+    return unknownFound ? RESULT_UNKNOWN : RESULT_DRAW;
   }
 
-
-  Result classify_btm(const KPKPosition &p) {
+  Result KPKPosition::classify_black(const Result db[]) {
 
     // If one move leads to a position classified as RESULT_DRAW, the result
-    // of the current position is RESULT_DRAW.  If all moves lead to positions
-    // classified as RESULT_WIN, the current position is classified as
-    // RESULT_LOSS.  Otherwise, the current position is classified as
-    // RESULT_UNKNOWN.
+    // of the current position is RESULT_DRAW. If all moves lead to positions
+    // classified as RESULT_WIN, the position is classified as RESULT_WIN.
+    // Otherwise, the current position is classified as RESULT_UNKNOWN.
 
     bool unknownFound = false;
     Bitboard b;
     Square s;
+    Result r;
 
     // King moves
-    b = p.bk_attacks();
-    while(b) {
-      s = pop_1st_bit(&b);
-      switch(Bitbase[compute_index(p.whiteKingSquare, s, p.pawnSquare,
-                                   WHITE)]) {
-      case RESULT_DRAW:
-        return RESULT_DRAW;
+    b = bk_attacks();
+    while (b)
+    {
+        s = pop_1st_bit(&b);
+        r = db[compute_index(whiteKingSquare, s, pawnSquare, WHITE)];
 
-      case RESULT_UNKNOWN:
-        unknownFound = true;
-        break;
+        if (r == RESULT_DRAW)
+            return RESULT_DRAW;
 
-      case RESULT_WIN: case RESULT_INVALID:
-        break;
-
-      default:
-        assert(false);
-      }
+        if (r == RESULT_UNKNOWN)
+            unknownFound = true;
     }
-
-    return unknownFound? RESULT_UNKNOWN : RESULT_LOSS;
-  }
-
-
-  int compute_index(Square wksq, Square bksq, Square psq, Color stm) {
-    int p = int(square_file(psq)) + (int(square_rank(psq)) - 1) * 4;
-    int result = int(stm) + 2*int(bksq) + 128*int(wksq) + 8192*p;
-    assert(result >= 0 && result < IndexMax);
-    return result;
-  }
-
-
-  int compress_result(Result r) {
-    return (r == RESULT_WIN || r == RESULT_LOSS)? 1 : 0;
+    return unknownFound ? RESULT_UNKNOWN : RESULT_WIN;
   }
 
 }

src/bitbase.h

@@ -1,38 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(BITBASE_H_INCLUDED)
-#define BITBASE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include "types.h"
-
-
-////
-//// Prototypes
-////
-
-extern void generate_kpk_bitbase(uint8_t bitbase[]);
-
-
-#endif // !defined(BITBASE_H_INCLUDED)

src/bitboard.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,215 +17,34 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
+#include <algorithm>
+#include <cstring>
 #include <iostream>
 
 #include "bitboard.h"
 #include "bitcount.h"
-#include "direction.h"
+#include "rkiss.h"
 
+Bitboard RMasks[64];
+Bitboard RMagics[64];
+Bitboard* RAttacks[64];
+int RShifts[64];
 
-#if defined(IS_64BIT)
-
-const uint64_t BMult[64] = {
-  0x440049104032280ULL, 0x1021023c82008040ULL, 0x404040082000048ULL,
-  0x48c4440084048090ULL, 0x2801104026490000ULL, 0x4100880442040800ULL,
-  0x181011002e06040ULL, 0x9101004104200e00ULL, 0x1240848848310401ULL,
-  0x2000142828050024ULL, 0x1004024d5000ULL, 0x102044400800200ULL,
-  0x8108108820112000ULL, 0xa880818210c00046ULL, 0x4008008801082000ULL,
-  0x60882404049400ULL, 0x104402004240810ULL, 0xa002084250200ULL,
-  0x100b0880801100ULL, 0x4080201220101ULL, 0x44008080a00000ULL,
-  0x202200842000ULL, 0x5006004882d00808ULL, 0x200045080802ULL,
-  0x86100020200601ULL, 0xa802080a20112c02ULL, 0x80411218080900ULL,
-  0x200a0880080a0ULL, 0x9a01010000104000ULL, 0x28008003100080ULL,
-  0x211021004480417ULL, 0x401004188220806ULL, 0x825051400c2006ULL,
-  0x140c0210943000ULL, 0x242800300080ULL, 0xc2208120080200ULL,
-  0x2430008200002200ULL, 0x1010100112008040ULL, 0x8141050100020842ULL,
-  0x822081014405ULL, 0x800c049e40400804ULL, 0x4a0404028a000820ULL,
-  0x22060201041200ULL, 0x360904200840801ULL, 0x881a08208800400ULL,
-  0x60202c00400420ULL, 0x1204440086061400ULL, 0x8184042804040ULL,
-  0x64040315300400ULL, 0xc01008801090a00ULL, 0x808010401140c00ULL,
-  0x4004830c2020040ULL, 0x80005002020054ULL, 0x40000c14481a0490ULL,
-  0x10500101042048ULL, 0x1010100200424000ULL, 0x640901901040ULL,
-  0xa0201014840ULL, 0x840082aa011002ULL, 0x10010840084240aULL,
-  0x420400810420608ULL, 0x8d40230408102100ULL, 0x4a00200612222409ULL,
-  0xa08520292120600ULL
-};
-
-const uint64_t RMult[64] = {
-  0xa8002c000108020ULL, 0x4440200140003000ULL, 0x8080200010011880ULL,
-  0x380180080141000ULL, 0x1a00060008211044ULL, 0x410001000a0c0008ULL,
-  0x9500060004008100ULL, 0x100024284a20700ULL, 0x802140008000ULL,
-  0x80c01002a00840ULL, 0x402004282011020ULL, 0x9862000820420050ULL,
-  0x1001448011100ULL, 0x6432800200800400ULL, 0x40100010002000cULL,
-  0x2800d0010c080ULL, 0x90c0008000803042ULL, 0x4010004000200041ULL,
-  0x3010010200040ULL, 0xa40828028001000ULL, 0x123010008000430ULL,
-  0x24008004020080ULL, 0x60040001104802ULL, 0x582200028400d1ULL,
-  0x4000802080044000ULL, 0x408208200420308ULL, 0x610038080102000ULL,
-  0x3601000900100020ULL, 0x80080040180ULL, 0xc2020080040080ULL,
-  0x80084400100102ULL, 0x4022408200014401ULL, 0x40052040800082ULL,
-  0xb08200280804000ULL, 0x8a80a008801000ULL, 0x4000480080801000ULL,
-  0x911808800801401ULL, 0x822a003002001894ULL, 0x401068091400108aULL,
-  0x4a10a00004cULL, 0x2000800640008024ULL, 0x1486408102020020ULL,
-  0x100a000d50041ULL, 0x810050020b0020ULL, 0x204000800808004ULL,
-  0x20048100a000cULL, 0x112000831020004ULL, 0x9000040810002ULL,
-  0x440490200208200ULL, 0x8910401000200040ULL, 0x6404200050008480ULL,
-  0x4b824a2010010100ULL, 0x4080801810c0080ULL, 0x400802a0080ULL,
-  0x8224080110026400ULL, 0x40002c4104088200ULL, 0x1002100104a0282ULL,
-  0x1208400811048021ULL, 0x3201014a40d02001ULL, 0x5100019200501ULL,
-  0x101000208001005ULL, 0x2008450080702ULL, 0x1002080301d00cULL,
-  0x410201ce5c030092ULL
-};
-
-const int BShift[64] = {
-  58, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59, 59, 59, 59, 59, 59,
-  59, 59, 57, 57, 57, 57, 59, 59, 59, 59, 57, 55, 55, 57, 59, 59,
-  59, 59, 57, 55, 55, 57, 59, 59, 59, 59, 57, 57, 57, 57, 59, 59,
-  59, 59, 59, 59, 59, 59, 59, 59, 58, 59, 59, 59, 59, 59, 59, 58
-};
-
-const int RShift[64] = {
-  52, 53, 53, 53, 53, 53, 53, 52, 53, 54, 54, 54, 54, 54, 54, 53,
-  53, 54, 54, 54, 54, 54, 54, 53, 53, 54, 54, 54, 54, 54, 54, 53,
-  53, 54, 54, 54, 54, 54, 54, 53, 53, 54, 54, 54, 54, 54, 54, 53,
-  53, 54, 54, 54, 54, 54, 54, 53, 52, 53, 53, 53, 53, 53, 53, 52
-};
-
-#else // if !defined(IS_64BIT)
-
-const uint64_t BMult[64] = {
-  0x54142844c6a22981ULL, 0x710358a6ea25c19eULL, 0x704f746d63a4a8dcULL,
-  0xbfed1a0b80f838c5ULL, 0x90561d5631e62110ULL, 0x2804260376e60944ULL,
-  0x84a656409aa76871ULL, 0xf0267f64c28b6197ULL, 0x70764ebb762f0585ULL,
-  0x92aa09e0cfe161deULL, 0x41ee1f6bb266f60eULL, 0xddcbf04f6039c444ULL,
-  0x5a3fab7bac0d988aULL, 0xd3727877fa4eaa03ULL, 0xd988402d868ddaaeULL,
-  0x812b291afa075c7cULL, 0x94faf987b685a932ULL, 0x3ed867d8470d08dbULL,
-  0x92517660b8901de8ULL, 0x2d97e43e058814b4ULL, 0x880a10c220b25582ULL,
-  0xc7c6520d1f1a0477ULL, 0xdbfc7fbcd7656aa6ULL, 0x78b1b9bfb1a2b84fULL,
-  0x2f20037f112a0bc1ULL, 0x657171ea2269a916ULL, 0xc08302b07142210eULL,
-  0x880a4403064080bULL, 0x3602420842208c00ULL, 0x852800dc7e0b6602ULL,
-  0x595a3fbbaa0f03b2ULL, 0x9f01411558159d5eULL, 0x2b4a4a5f88b394f2ULL,
-  0x4afcbffc292dd03aULL, 0x4a4094a3b3f10522ULL, 0xb06f00b491f30048ULL,
-  0xd5b3820280d77004ULL, 0x8b2e01e7c8e57a75ULL, 0x2d342794e886c2e6ULL,
-  0xc302c410cde21461ULL, 0x111f426f1379c274ULL, 0xe0569220abb31588ULL,
-  0x5026d3064d453324ULL, 0xe2076040c343cd8aULL, 0x93efd1e1738021eeULL,
-  0xb680804bed143132ULL, 0x44e361b21986944cULL, 0x44c60170ef5c598cULL,
-  0xf4da475c195c9c94ULL, 0xa3afbb5f72060b1dULL, 0xbc75f410e41c4ffcULL,
-  0xb51c099390520922ULL, 0x902c011f8f8ec368ULL, 0x950b56b3d6f5490aULL,
-  0x3909e0635bf202d0ULL, 0x5744f90206ec10ccULL, 0xdc59fd76317abbc1ULL,
-  0x881c7c67fcbfc4f6ULL, 0x47ca41e7e440d423ULL, 0xeb0c88112048d004ULL,
-  0x51c60e04359aef1aULL, 0x1aa1fe0e957a5554ULL, 0xdd9448db4f5e3104ULL,
-  0xdc01f6dca4bebbdcULL,
-};
-
-const uint64_t RMult[64] = {
-  0xd7445cdec88002c0ULL, 0xd0a505c1f2001722ULL, 0xe065d1c896002182ULL,
-  0x9a8c41e75a000892ULL, 0x8900b10c89002aa8ULL, 0x9b28d1c1d60005a2ULL,
-  0x15d6c88de002d9aULL, 0xb1dbfc802e8016a9ULL, 0x149a1042d9d60029ULL,
-  0xb9c08050599e002fULL, 0x132208c3af300403ULL, 0xc1000ce2e9c50070ULL,
-  0x9d9aa13c99020012ULL, 0xb6b078daf71e0046ULL, 0x9d880182fb6e002eULL,
-  0x52889f467e850037ULL, 0xda6dc008d19a8480ULL, 0x468286034f902420ULL,
-  0x7140ac09dc54c020ULL, 0xd76ffffa39548808ULL, 0xea901c4141500808ULL,
-  0xc91004093f953a02ULL, 0x2882afa8f6bb402ULL, 0xaebe335692442c01ULL,
-  0xe904a22079fb91eULL, 0x13a514851055f606ULL, 0x76c782018c8fe632ULL,
-  0x1dc012a9d116da06ULL, 0x3c9e0037264fffa6ULL, 0x2036002853c6e4a2ULL,
-  0xe3fe08500afb47d4ULL, 0xf38af25c86b025c2ULL, 0xc0800e2182cf9a40ULL,
-  0x72002480d1f60673ULL, 0x2500200bae6e9b53ULL, 0xc60018c1eefca252ULL,
-  0x600590473e3608aULL, 0x46002c4ab3fe51b2ULL, 0xa200011486bcc8d2ULL,
-  0xb680078095784c63ULL, 0x2742002639bf11aeULL, 0xc7d60021a5bdb142ULL,
-  0xc8c04016bb83d820ULL, 0xbd520028123b4842ULL, 0x9d1600344ac2a832ULL,
-  0x6a808005631c8a05ULL, 0x604600a148d5389aULL, 0xe2e40103d40dea65ULL,
-  0x945b5a0087c62a81ULL, 0x12dc200cd82d28eULL, 0x2431c600b5f9ef76ULL,
-  0xfb142a006a9b314aULL, 0x6870e00a1c97d62ULL, 0x2a9db2004a2689a2ULL,
-  0xd3594600caf5d1a2ULL, 0xee0e4900439344a7ULL, 0x89c4d266ca25007aULL,
-  0x3e0013a2743f97e3ULL, 0x180e31a0431378aULL, 0x3a9e465a4d42a512ULL,
-  0x98d0a11a0c0d9cc2ULL, 0x8e711c1aba19b01eULL, 0x8dcdc836dd201142ULL,
-  0x5ac08a4735370479ULL,
-};
-
-const int BShift[64] = {
-  26, 27, 27, 27, 27, 27, 27, 26, 27, 27, 27, 27, 27, 27, 27, 27,
-  27, 27, 25, 25, 25, 25, 27, 27, 27, 27, 25, 23, 23, 25, 27, 27,
-  27, 27, 25, 23, 23, 25, 27, 27, 27, 27, 25, 25, 25, 25, 27, 27,
-  27, 27, 27, 27, 27, 27, 27, 27, 26, 27, 27, 27, 27, 27, 27, 26
-};
-
-const int RShift[64] = {
-  20, 21, 21, 21, 21, 21, 21, 20, 21, 22, 22, 22, 22, 22, 22, 21,
-  21, 22, 22, 22, 22, 22, 22, 21, 21, 22, 22, 22, 22, 22, 22, 21,
-  21, 22, 22, 22, 22, 22, 22, 21, 21, 22, 22, 22, 22, 22, 22, 21,
-  21, 22, 22, 22, 22, 22, 22, 21, 20, 21, 21, 21, 21, 21, 21, 20
-};
-
-#endif // defined(IS_64BIT)
-
-const Bitboard SquaresByColorBB[2] = { BlackSquaresBB, WhiteSquaresBB };
-
-const Bitboard FileBB[8] = {
-  FileABB, FileBBB, FileCBB, FileDBB, FileEBB, FileFBB, FileGBB, FileHBB
-};
-
-const Bitboard NeighboringFilesBB[8] = {
-  FileBBB, FileABB|FileCBB, FileBBB|FileDBB, FileCBB|FileEBB,
-  FileDBB|FileFBB, FileEBB|FileGBB, FileFBB|FileHBB, FileGBB
-};
-
-const Bitboard ThisAndNeighboringFilesBB[8] = {
-  FileABB|FileBBB, FileABB|FileBBB|FileCBB,
-  FileBBB|FileCBB|FileDBB, FileCBB|FileDBB|FileEBB,
-  FileDBB|FileEBB|FileFBB, FileEBB|FileFBB|FileGBB,
-  FileFBB|FileGBB|FileHBB, FileGBB|FileHBB
-};
-
-const Bitboard RankBB[8] = {
-  Rank1BB, Rank2BB, Rank3BB, Rank4BB, Rank5BB, Rank6BB, Rank7BB, Rank8BB
-};
-
-const Bitboard RelativeRankBB[2][8] = {
-  { Rank1BB, Rank2BB, Rank3BB, Rank4BB, Rank5BB, Rank6BB, Rank7BB, Rank8BB },
-  { Rank8BB, Rank7BB, Rank6BB, Rank5BB, Rank4BB, Rank3BB, Rank2BB, Rank1BB }
-};
-
-const Bitboard InFrontBB[2][8] = {
-  { Rank2BB | Rank3BB | Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
-    Rank3BB | Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
-    Rank4BB | Rank5BB | Rank6BB | Rank7BB | Rank8BB,
-    Rank5BB | Rank6BB | Rank7BB | Rank8BB,
-    Rank6BB | Rank7BB | Rank8BB,
-    Rank7BB | Rank8BB,
-    Rank8BB,
-    EmptyBoardBB
-  },
-  { EmptyBoardBB,
-    Rank1BB,
-    Rank2BB | Rank1BB,
-    Rank3BB | Rank2BB | Rank1BB,
-    Rank4BB | Rank3BB | Rank2BB | Rank1BB,
-    Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB,
-    Rank6BB | Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB,
-    Rank7BB | Rank6BB | Rank5BB | Rank4BB | Rank3BB | Rank2BB | Rank1BB
-  }
-};
-
-Bitboard RMask[64];
-int RAttackIndex[64];
-Bitboard RAttacks[0x19000];
-
-Bitboard BMask[64];
-int BAttackIndex[64];
-Bitboard BAttacks[0x1480];
+Bitboard BMasks[64];
+Bitboard BMagics[64];
+Bitboard* BAttacks[64];
+int BShifts[64];
 
 Bitboard SetMaskBB[65];
 Bitboard ClearMaskBB[65];
 
-Bitboard StepAttackBB[16][64];
-Bitboard RayBB[64][8];
+Bitboard FileBB[8];
+Bitboard RankBB[8];
+Bitboard NeighboringFilesBB[8];
+Bitboard ThisAndNeighboringFilesBB[8];
+Bitboard InFrontBB[2][8];
+Bitboard StepAttacksBB[16][64];
 Bitboard BetweenBB[64][64];
-
 Bitboard SquaresInFrontMask[2][64];
 Bitboard PassedPawnMask[2][64];
 Bitboard AttackSpanMask[2][64];
@@ -235,105 +54,60 @@ Bitboard RookPseudoAttacks[64];
 Bitboard QueenPseudoAttacks[64];
 
 uint8_t BitCount8Bit[256];
-
-
-////
-//// Local definitions
-////
+int SquareDistance[64][64];
 
 namespace {
 
-  void init_masks();
-  void init_ray_bitboards();
-  void init_attacks();
-  void init_between_bitboards();
-  void init_pseudo_attacks();
-  Bitboard index_to_bitboard(int index, Bitboard mask);
-  Bitboard sliding_attacks(int sq, Bitboard block, int dirs, int deltas[][2],
-                           int fmin, int fmax, int rmin, int rmax);
-  void init_sliding_attacks(Bitboard attacks[], int attackIndex[], Bitboard mask[],
-                            const int shift[], const Bitboard mult[], int deltas[][2]);
+  CACHE_LINE_ALIGNMENT
+
+  int BSFTable[64];
+  Bitboard RookTable[0x19000];  // Storage space for rook attacks
+  Bitboard BishopTable[0x1480]; // Storage space for bishop attacks
+
+  void init_magic_bitboards(PieceType pt, Bitboard* attacks[], Bitboard magics[],
+                            Bitboard masks[], int shifts[]);
 }
 
 
-////
-//// Functions
-////
-
 /// print_bitboard() prints a bitboard in an easily readable format to the
-/// standard output.  This is sometimes useful for debugging.
+/// standard output. This is sometimes useful for debugging.
 
 void print_bitboard(Bitboard b) {
 
   for (Rank r = RANK_8; r >= RANK_1; r--)
   {
-      std::cout << "+---+---+---+---+---+---+---+---+" << std::endl;
+      std::cout << "+---+---+---+---+---+---+---+---+" << '\n';
       for (File f = FILE_A; f <= FILE_H; f++)
-          std::cout << "| " << (bit_is_set(b, make_square(f, r))? 'X' : ' ') << ' ';
+          std::cout << "| " << (bit_is_set(b, make_square(f, r)) ? "X " : "  ");
 
-      std::cout << "|" << std::endl;
+      std::cout << "|\n";
   }
   std::cout << "+---+---+---+---+---+---+---+---+" << std::endl;
 }
 
 
-/// init_bitboards() initializes various bitboard arrays.  It is called during
-/// program initialization.
-
-void init_bitboards() {
-
-  int rookDeltas[4][2] = {{0,1},{0,-1},{1,0},{-1,0}};
-  int bishopDeltas[4][2] = {{1,1},{-1,1},{1,-1},{-1,-1}};
-
-  init_masks();
-  init_ray_bitboards();
-  init_attacks();
-  init_between_bitboards();
-  init_sliding_attacks(RAttacks, RAttackIndex, RMask, RShift, RMult, rookDeltas);
-  init_sliding_attacks(BAttacks, BAttackIndex, BMask, BShift, BMult, bishopDeltas);
-  init_pseudo_attacks();
-}
-
-
 /// first_1() finds the least significant nonzero bit in a nonzero bitboard.
 /// pop_1st_bit() finds and clears the least significant nonzero bit in a
 /// nonzero bitboard.
 
 #if defined(IS_64BIT) && !defined(USE_BSFQ)
 
-static CACHE_LINE_ALIGNMENT
-const int BitTable[64] = {
-  0, 1, 2, 7, 3, 13, 8, 19, 4, 25, 14, 28, 9, 34, 20, 40, 5, 17, 26, 38, 15,
-  46, 29, 48, 10, 31, 35, 54, 21, 50, 41, 57, 63, 6, 12, 18, 24, 27, 33, 39,
-  16, 37, 45, 47, 30, 53, 49, 56, 62, 11, 23, 32, 36, 44, 52, 55, 61, 22, 43,
-  51, 60, 42, 59, 58
-};
-
 Square first_1(Bitboard b) {
-  return Square(BitTable[((b & -b) * 0x218a392cd3d5dbfULL) >> 58]);
+  return Square(BSFTable[((b & -b) * 0x218A392CD3D5DBFULL) >> 58]);
 }
 
 Square pop_1st_bit(Bitboard* b) {
   Bitboard bb = *b;
   *b &= (*b - 1);
-  return Square(BitTable[((bb & -bb) * 0x218a392cd3d5dbfULL) >> 58]);
+  return Square(BSFTable[((bb & -bb) * 0x218A392CD3D5DBFULL) >> 58]);
 }
 
 #elif !defined(USE_BSFQ)
 
-static CACHE_LINE_ALIGNMENT
-const int BitTable[64] = {
-  63, 30, 3, 32, 25, 41, 22, 33, 15, 50, 42, 13, 11, 53, 19, 34, 61, 29, 2,
-  51, 21, 43, 45, 10, 18, 47, 1, 54, 9, 57, 0, 35, 62, 31, 40, 4, 49, 5, 52,
-  26, 60, 6, 23, 44, 46, 27, 56, 16, 7, 39, 48, 24, 59, 14, 12, 55, 38, 28,
-  58, 20, 37, 17, 36, 8
-};
-
 Square first_1(Bitboard b) {
-
   b ^= (b - 1);
-  uint32_t fold = int(b) ^ int(b >> 32);
-  return Square(BitTable[(fold * 0x783a9b23) >> 26]);
+  uint32_t fold = unsigned(b) ^ unsigned(b >> 32);
+  return Square(BSFTable[(fold * 0x783A9B23) >> 26]);
 }
 
 // Use type-punning
@@ -360,185 +134,233 @@ Square pop_1st_bit(Bitboard* bb) {
 
    if (u.dw.l)
    {
-       ret = Square(BitTable[((u.dw.l ^ (u.dw.l - 1)) * 0x783a9b23) >> 26]);
+       ret = Square(BSFTable[((u.dw.l ^ (u.dw.l - 1)) * 0x783A9B23) >> 26]);
        u.dw.l &= (u.dw.l - 1);
        *bb = u.b;
        return ret;
    }
-   ret = Square(BitTable[((~(u.dw.h ^ (u.dw.h - 1))) * 0x783a9b23) >> 26]);
+   ret = Square(BSFTable[((~(u.dw.h ^ (u.dw.h - 1))) * 0x783A9B23) >> 26]);
    u.dw.h &= (u.dw.h - 1);
    *bb = u.b;
    return ret;
 }
 
-#endif
+#endif // !defined(USE_BSFQ)
+
+
+/// bitboards_init() initializes various bitboard arrays. It is called during
+/// program initialization.
+
+void bitboards_init() {
+
+  for (Bitboard b = 0; b < 256; b++)
+      BitCount8Bit[b] = (uint8_t)popcount<Max15>(b);
+
+  for (Square s = SQ_A1; s <= SQ_H8; s++)
+  {
+      SetMaskBB[s] = 1ULL << s;
+      ClearMaskBB[s] = ~SetMaskBB[s];
+  }
+
+  ClearMaskBB[SQ_NONE] = ~0ULL;
+
+  FileBB[FILE_A] = FileABB;
+  RankBB[RANK_1] = Rank1BB;
+
+  for (int f = FILE_B; f <= FILE_H; f++)
+  {
+      FileBB[f] = FileBB[f - 1] << 1;
+      RankBB[f] = RankBB[f - 1] << 8;
+  }
+
+  for (int f = FILE_A; f <= FILE_H; f++)
+  {
+      NeighboringFilesBB[f] = (f > FILE_A ? FileBB[f - 1] : 0) | (f < FILE_H ? FileBB[f + 1] : 0);
+      ThisAndNeighboringFilesBB[f] = FileBB[f] | NeighboringFilesBB[f];
+  }
+
+  for (int rw = RANK_7, rb = RANK_2; rw >= RANK_1; rw--, rb++)
+  {
+      InFrontBB[WHITE][rw] = InFrontBB[WHITE][rw + 1] | RankBB[rw + 1];
+      InFrontBB[BLACK][rb] = InFrontBB[BLACK][rb - 1] | RankBB[rb - 1];
+  }
+
+  for (Color c = WHITE; c <= BLACK; c++)
+      for (Square s = SQ_A1; s <= SQ_H8; s++)
+      {
+          SquaresInFrontMask[c][s] = in_front_bb(c, s) & file_bb(s);
+          PassedPawnMask[c][s]     = in_front_bb(c, s) & this_and_neighboring_files_bb(file_of(s));
+          AttackSpanMask[c][s]     = in_front_bb(c, s) & neighboring_files_bb(file_of(s));
+      }
+
+  for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
+      for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
+          SquareDistance[s1][s2] = std::max(file_distance(s1, s2), rank_distance(s1, s2));
+
+  for (int i = 0; i < 64; i++)
+      if (!Is64Bit) // Matt Taylor's folding trick for 32 bit systems
+      {
+          Bitboard b = 1ULL << i;
+          b ^= b - 1;
+          b ^= b >> 32;
+          BSFTable[uint32_t(b * 0x783A9B23) >> 26] = i;
+      }
+      else
+          BSFTable[((1ULL << i) * 0x218A392CD3D5DBFULL) >> 58] = i;
+
+  int steps[][9] = { {}, { 7, 9 }, { 17, 15, 10, 6, -6, -10, -15, -17 },
+                     {}, {}, {}, { 9, 7, -7, -9, 8, 1, -1, -8 } };
+
+  for (Color c = WHITE; c <= BLACK; c++)
+      for (PieceType pt = PAWN; pt <= KING; pt++)
+          for (Square s = SQ_A1; s <= SQ_H8; s++)
+              for (int k = 0; steps[pt][k]; k++)
+              {
+                  Square to = s + Square(c == WHITE ? steps[pt][k] : -steps[pt][k]);
+
+                  if (square_is_ok(to) && square_distance(s, to) < 3)
+                      set_bit(&StepAttacksBB[make_piece(c, pt)][s], to);
+              }
+
+  init_magic_bitboards(ROOK, RAttacks, RMagics, RMasks, RShifts);
+  init_magic_bitboards(BISHOP, BAttacks, BMagics, BMasks, BShifts);
+
+  for (Square s = SQ_A1; s <= SQ_H8; s++)
+  {
+      BishopPseudoAttacks[s] = bishop_attacks_bb(s, 0);
+      RookPseudoAttacks[s]   = rook_attacks_bb(s, 0);
+      QueenPseudoAttacks[s]  = queen_attacks_bb(s, 0);
+  }
+
+  for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
+      for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
+          if (bit_is_set(QueenPseudoAttacks[s1], s2))
+          {
+              Square delta = (s2 - s1) / square_distance(s1, s2);
+
+              for (Square s = s1 + delta; s != s2; s += delta)
+                  set_bit(&BetweenBB[s1][s2], s);
+          }
+}
 
 
 namespace {
 
-  // All functions below are used to precompute various bitboards during
-  // program initialization.  Some of the functions may be difficult to
-  // understand, but they all seem to work correctly, and it should never
-  // be necessary to touch any of them.
+  Bitboard sliding_attacks(PieceType pt, Square sq, Bitboard occupied) {
 
-  void init_masks() {
+    Square deltas[][4] = { { DELTA_N,  DELTA_E,  DELTA_S,  DELTA_W  },
+                           { DELTA_NE, DELTA_SE, DELTA_SW, DELTA_NW } };
+    Bitboard attacks = 0;
+    Square* delta = (pt == ROOK ? deltas[0] : deltas[1]);
 
-    SetMaskBB[SQ_NONE] = 0ULL;
-    ClearMaskBB[SQ_NONE] = ~SetMaskBB[SQ_NONE];
-
-    for (Square s = SQ_A1; s <= SQ_H8; s++)
+    for (int i = 0; i < 4; i++)
     {
-        SetMaskBB[s] = (1ULL << s);
-        ClearMaskBB[s] = ~SetMaskBB[s];
-    }
+        Square s = sq + delta[i];
 
-    for (Color c = WHITE; c <= BLACK; c++)
-        for (Square s = SQ_A1; s <= SQ_H8; s++)
+        while (square_is_ok(s) && square_distance(s, s - delta[i]) == 1)
         {
-            SquaresInFrontMask[c][s] = in_front_bb(c, s) & file_bb(s);
-            PassedPawnMask[c][s] = in_front_bb(c, s) & this_and_neighboring_files_bb(s);
-            AttackSpanMask[c][s] = in_front_bb(c, s) & neighboring_files_bb(s);
-        }
+            set_bit(&attacks, s);
 
-    for (Bitboard b = 0ULL; b < 256ULL; b++)
-        BitCount8Bit[b] = (uint8_t)count_1s(b);
-  }
-
-  int remove_bit_8(int i) { return ((i & ~15) >> 1) | (i & 7); }
-
-  void init_ray_bitboards() {
-
-    int d[8] = {1, -1, 16, -16, 17, -17, 15, -15};
-
-    for (int i = 0; i < 128; i = (i + 9) & ~8)
-        for (int j = 0; j < 8; j++)
-        {
-            RayBB[remove_bit_8(i)][j] = EmptyBoardBB;
-            for (int k = i + d[j]; (k & 0x88) == 0; k += d[j])
-                set_bit(&(RayBB[remove_bit_8(i)][j]), Square(remove_bit_8(k)));
-        }
-  }
-
-  void init_attacks() {
-
-    const int step[16][8] =  {
-      {0},
-      {7,9,0}, {17,15,10,6,-6,-10,-15,-17}, {9,7,-7,-9,0}, {8,1,-1,-8,0},
-      {9,7,-7,-9,8,1,-1,-8}, {9,7,-7,-9,8,1,-1,-8}, {0}, {0},
-      {-7,-9,0}, {17,15,10,6,-6,-10,-15,-17}, {9,7,-7,-9,0}, {8,1,-1,-8,0},
-      {9,7,-7,-9,8,1,-1,-8}, {9,7,-7,-9,8,1,-1,-8}
-    };
-
-    for (int i = 0; i < 64; i++)
-        for (int j = 0; j <= int(BK); j++)
-        {
-            StepAttackBB[j][i] = EmptyBoardBB;
-            for (int k = 0; k < 8 && step[j][k] != 0; k++)
-            {
-                int l = i + step[j][k];
-                if (l >= 0 && l < 64 && abs((i & 7) - (l & 7)) < 3)
-                    StepAttackBB[j][i] |= (1ULL << l);
-           }
-        }
-  }
-
-  Bitboard sliding_attacks(int sq, Bitboard block, int dirs, int deltas[][2],
-                           int fmin=0, int fmax=7, int rmin=0, int rmax=7) {
-    Bitboard result = 0ULL;
-    int rk = sq / 8;
-    int fl = sq % 8;
-
-    for (int i = 0; i < dirs; i++)
-    {
-        int dx = deltas[i][0];
-        int dy = deltas[i][1];
-        int f = fl + dx;
-        int r = rk + dy;
-
-        while (   (dx == 0 || (f >= fmin && f <= fmax))
-               && (dy == 0 || (r >= rmin && r <= rmax)))
-        {
-            result |= (1ULL << (f + r*8));
-            if (block & (1ULL << (f + r*8)))
+            if (bit_is_set(occupied, s))
                 break;
 
-            f += dx;
-            r += dy;
+            s += delta[i];
         }
     }
-    return result;
+    return attacks;
   }
 
-  void init_between_bitboards() {
 
-    const SquareDelta step[8] = { DELTA_E, DELTA_W, DELTA_N, DELTA_S,
-                                  DELTA_NE, DELTA_SW, DELTA_NW, DELTA_SE };
+  Bitboard pick_random(Bitboard mask, RKISS& rk, int booster) {
 
-    for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
-        for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
-        {
-            BetweenBB[s1][s2] = EmptyBoardBB;
-            SignedDirection d = signed_direction_between_squares(s1, s2);
+    Bitboard magic;
 
-            if (d != SIGNED_DIR_NONE)
-            {
-                for (Square s3 = s1 + step[d]; s3 != s2; s3 += step[d])
-                    set_bit(&(BetweenBB[s1][s2]), s3);
-            }
-      }
-  }
+    // Values s1 and s2 are used to rotate the candidate magic of a
+    // quantity known to be the optimal to quickly find the magics.
+    int s1 = booster & 63, s2 = (booster >> 6) & 63;
 
-  Bitboard index_to_bitboard(int index, Bitboard mask) {
-
-    Bitboard result = 0ULL;
-    int bits = count_1s(mask);
-
-    for (int i = 0; i < bits; i++)
+    while (true)
     {
-        int j = pop_1st_bit(&mask);
-        if (index & (1 << i))
-            result |= (1ULL << j);
-    }
-    return result;
-  }
+        magic = rk.rand<Bitboard>();
+        magic = (magic >> s1) | (magic << (64 - s1));
+        magic &= rk.rand<Bitboard>();
+        magic = (magic >> s2) | (magic << (64 - s2));
+        magic &= rk.rand<Bitboard>();
 
-  void init_sliding_attacks(Bitboard attacks[], int attackIndex[], Bitboard mask[],
-                            const int shift[], const Bitboard mult[], int deltas[][2]) {
-
-    for (int i = 0, index = 0; i < 64; i++)
-    {
-        attackIndex[i] = index;
-        mask[i] = sliding_attacks(i, 0ULL, 4, deltas, 1, 6, 1, 6);
-
-#if defined(IS_64BIT)
-        int j = (1 << (64 - shift[i]));
-#else
-        int j = (1 << (32 - shift[i]));
-#endif
-
-        for (int k = 0; k < j; k++)
-        {
-#if defined(IS_64BIT)
-            Bitboard b = index_to_bitboard(k, mask[i]);
-            attacks[index + ((b * mult[i]) >> shift[i])] = sliding_attacks(i, b, 4, deltas);
-#else
-            Bitboard b = index_to_bitboard(k, mask[i]);
-            unsigned v = int(b) * int(mult[i]) ^ int(b >> 32) * int(mult[i] >> 32);
-            attacks[index + (v >> shift[i])] = sliding_attacks(i, b, 4, deltas);
-#endif
-        }
-        index += j;
+        if (BitCount8Bit[(mask * magic) >> 56] >= 6)
+            return magic;
     }
   }
 
-  void init_pseudo_attacks() {
+
+  // init_magic_bitboards() computes all rook and bishop magics at startup.
+  // Magic bitboards are used to look up attacks of sliding pieces. As reference
+  // see chessprogramming.wikispaces.com/Magic+Bitboards. In particular, here we
+  // use the so called "fancy" approach.
+
+  void init_magic_bitboards(PieceType pt, Bitboard* attacks[], Bitboard magics[],
+                            Bitboard masks[], int shifts[]) {
+
+    int MagicBoosters[][8] = { { 3191, 2184, 1310, 3618, 2091, 1308, 2452, 3996 },
+                               { 1059, 3608,  605, 3234, 3326,   38, 2029, 3043 } };
+    RKISS rk;
+    Bitboard occupancy[4096], reference[4096], edges, b;
+    int i, size, index, booster;
+
+    // attacks[s] is a pointer to the beginning of the attacks table for square 's'
+    attacks[SQ_A1] = (pt == ROOK ? RookTable : BishopTable);
 
     for (Square s = SQ_A1; s <= SQ_H8; s++)
     {
-        BishopPseudoAttacks[s] = bishop_attacks_bb(s, EmptyBoardBB);
-        RookPseudoAttacks[s]   = rook_attacks_bb(s, EmptyBoardBB);
-        QueenPseudoAttacks[s]  = queen_attacks_bb(s, EmptyBoardBB);
+        // Board edges are not considered in the relevant occupancies
+        edges = ((Rank1BB | Rank8BB) & ~rank_bb(s)) | ((FileABB | FileHBB) & ~file_bb(s));
+
+        // Given a square 's', the mask is the bitboard of sliding attacks from
+        // 's' computed on an empty board. The index must be big enough to contain
+        // all the attacks for each possible subset of the mask and so is 2 power
+        // the number of 1s of the mask. Hence we deduce the size of the shift to
+        // apply to the 64 or 32 bits word to get the index.
+        masks[s]  = sliding_attacks(pt, s, 0) & ~edges;
+        shifts[s] = (Is64Bit ? 64 : 32) - popcount<Max15>(masks[s]);
+
+        // Use Carry-Rippler trick to enumerate all subsets of masks[s] and
+        // store the corresponding sliding attacks bitboard in reference[].
+        b = size = 0;
+        do {
+            occupancy[size] = b;
+            reference[size++] = sliding_attacks(pt, s, b);
+            b = (b - masks[s]) & masks[s];
+        } while (b);
+
+        // Set the offset for the table of the next square. We have individual
+        // table sizes for each square with "Fancy Magic Bitboards".
+        if (s < SQ_H8)
+            attacks[s + 1] = attacks[s] + size;
+
+        booster = MagicBoosters[Is64Bit][rank_of(s)];
+
+        // Find a magic for square 's' picking up an (almost) random number
+        // until we find the one that passes the verification test.
+        do {
+            magics[s] = pick_random(masks[s], rk, booster);
+            memset(attacks[s], 0, size * sizeof(Bitboard));
+
+            // A good magic must map every possible occupancy to an index that
+            // looks up the correct sliding attack in the attacks[s] database.
+            // Note that we build up the database for square 's' as a side
+            // effect of verifying the magic.
+            for (i = 0; i < size; i++)
+            {
+                index = (pt == ROOK ? rook_index(s, occupancy[i])
+                                    : bishop_index(s, occupancy[i]));
+
+                if (!attacks[s][index])
+                    attacks[s][index] = reference[i];
+
+                else if (attacks[s][index] != reference[i])
+                    break;
+            }
+        } while (i != size);
     }
   }
-
 }

src/bitboard.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -18,77 +18,36 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(BITBOARD_H_INCLUDED)
 #define BITBOARD_H_INCLUDED
 
-////
-//// Includes
-////
-
-#include "direction.h"
-#include "piece.h"
-#include "square.h"
 #include "types.h"
 
-
-////
-//// Constants and variables
-////
-
-const Bitboard EmptyBoardBB = 0ULL;
-
-const Bitboard WhiteSquaresBB = 0x55AA55AA55AA55AAULL;
-const Bitboard BlackSquaresBB = 0xAA55AA55AA55AA55ULL;
-
-const Bitboard FileABB = 0x0101010101010101ULL;
-const Bitboard FileBBB = 0x0202020202020202ULL;
-const Bitboard FileCBB = 0x0404040404040404ULL;
-const Bitboard FileDBB = 0x0808080808080808ULL;
-const Bitboard FileEBB = 0x1010101010101010ULL;
-const Bitboard FileFBB = 0x2020202020202020ULL;
-const Bitboard FileGBB = 0x4040404040404040ULL;
-const Bitboard FileHBB = 0x8080808080808080ULL;
-
-const Bitboard Rank1BB = 0xFFULL;
-const Bitboard Rank2BB = 0xFF00ULL;
-const Bitboard Rank3BB = 0xFF0000ULL;
-const Bitboard Rank4BB = 0xFF000000ULL;
-const Bitboard Rank5BB = 0xFF00000000ULL;
-const Bitboard Rank6BB = 0xFF0000000000ULL;
-const Bitboard Rank7BB = 0xFF000000000000ULL;
-const Bitboard Rank8BB = 0xFF00000000000000ULL;
-
-extern const Bitboard SquaresByColorBB[2];
-extern const Bitboard FileBB[8];
-extern const Bitboard NeighboringFilesBB[8];
-extern const Bitboard ThisAndNeighboringFilesBB[8];
-extern const Bitboard RankBB[8];
-extern const Bitboard RelativeRankBB[2][8];
-extern const Bitboard InFrontBB[2][8];
+extern Bitboard FileBB[8];
+extern Bitboard NeighboringFilesBB[8];
+extern Bitboard ThisAndNeighboringFilesBB[8];
+extern Bitboard RankBB[8];
+extern Bitboard InFrontBB[2][8];
 
 extern Bitboard SetMaskBB[65];
 extern Bitboard ClearMaskBB[65];
 
-extern Bitboard StepAttackBB[16][64];
-extern Bitboard RayBB[64][8];
+extern Bitboard StepAttacksBB[16][64];
 extern Bitboard BetweenBB[64][64];
 
 extern Bitboard SquaresInFrontMask[2][64];
 extern Bitboard PassedPawnMask[2][64];
 extern Bitboard AttackSpanMask[2][64];
 
-extern const uint64_t RMult[64];
-extern const int RShift[64];
-extern Bitboard RMask[64];
-extern int RAttackIndex[64];
-extern Bitboard RAttacks[0x19000];
+extern uint64_t RMagics[64];
+extern int RShifts[64];
+extern Bitboard RMasks[64];
+extern Bitboard* RAttacks[64];
 
-extern const uint64_t BMult[64];
-extern const int BShift[64];
-extern Bitboard BMask[64];
-extern int BAttackIndex[64];
-extern Bitboard BAttacks[0x1480];
+extern uint64_t BMagics[64];
+extern int BShifts[64];
+extern Bitboard BMasks[64];
+extern Bitboard* BAttacks[64];
 
 extern Bitboard BishopPseudoAttacks[64];
 extern Bitboard RookPseudoAttacks[64];
@@ -97,10 +56,6 @@ extern Bitboard QueenPseudoAttacks[64];
 extern uint8_t BitCount8Bit[256];
 
 
-////
-//// Inline functions
-////
-
 /// Functions for testing whether a given bit is set in a bitboard, and for
 /// setting and clearing bits.
 
@@ -108,11 +63,11 @@ inline Bitboard bit_is_set(Bitboard b, Square s) {
   return b & SetMaskBB[s];
 }
 
-inline void set_bit(Bitboard *b, Square s) {
+inline void set_bit(Bitboard* b, Square s) {
   *b |= SetMaskBB[s];
 }
 
-inline void clear_bit(Bitboard *b, Square s) {
+inline void clear_bit(Bitboard* b, Square s) {
   *b &= ClearMaskBB[s];
 }
 
@@ -124,11 +79,12 @@ inline Bitboard make_move_bb(Square from, Square to) {
   return SetMaskBB[from] | SetMaskBB[to];
 }
 
-inline void do_move_bb(Bitboard *b, Bitboard move_bb) {
+inline void do_move_bb(Bitboard* b, Bitboard move_bb) {
   *b ^= move_bb;
 }
 
-/// rank_bb() and file_bb() take a file or a square as input, and return
+
+/// rank_bb() and file_bb() take a file or a square as input and return
 /// a bitboard representing all squares on the given file or rank.
 
 inline Bitboard rank_bb(Rank r) {
@@ -136,7 +92,7 @@ inline Bitboard rank_bb(Rank r) {
 }
 
 inline Bitboard rank_bb(Square s) {
-  return rank_bb(square_rank(s));
+  return RankBB[rank_of(s)];
 }
 
 inline Bitboard file_bb(File f) {
@@ -144,45 +100,25 @@ inline Bitboard file_bb(File f) {
 }
 
 inline Bitboard file_bb(Square s) {
-  return file_bb(square_file(s));
+  return FileBB[file_of(s)];
 }
 
 
-/// neighboring_files_bb takes a file or a square as input, and returns a
-/// bitboard representing all squares on the neighboring files.
+/// neighboring_files_bb takes a file as input and returns a bitboard representing
+/// all squares on the neighboring files.
 
 inline Bitboard neighboring_files_bb(File f) {
   return NeighboringFilesBB[f];
 }
 
-inline Bitboard neighboring_files_bb(Square s) {
-  return NeighboringFilesBB[square_file(s)];
-}
 
-
-/// this_and_neighboring_files_bb takes a file or a square as input, and
-/// returns a bitboard representing all squares on the given and neighboring
-/// files.
+/// this_and_neighboring_files_bb takes a file as input and returns a bitboard
+/// representing all squares on the given and neighboring files.
 
 inline Bitboard this_and_neighboring_files_bb(File f) {
   return ThisAndNeighboringFilesBB[f];
 }
 
-inline Bitboard this_and_neighboring_files_bb(Square s) {
-  return ThisAndNeighboringFilesBB[square_file(s)];
-}
-
-
-/// relative_rank_bb() takes a color and a rank as input, and returns a bitboard
-/// representing all squares on the given rank from the given color's point of
-/// view. For instance, relative_rank_bb(WHITE, 7) gives all squares on the
-/// 7th rank, while relative_rank_bb(BLACK, 7) gives all squares on the 2nd
-/// rank.
-
-inline Bitboard relative_rank_bb(Color c, Rank r) {
-  return RelativeRankBB[c][r];
-}
-
 
 /// in_front_bb() takes a color and a rank or square as input, and returns a
 /// bitboard representing all the squares on all ranks in front of the rank
@@ -195,28 +131,7 @@ inline Bitboard in_front_bb(Color c, Rank r) {
 }
 
 inline Bitboard in_front_bb(Color c, Square s) {
-  return InFrontBB[c][square_rank(s)];
-}
-
-
-/// behind_bb() takes a color and a rank or square as input, and returns a
-/// bitboard representing all the squares on all ranks behind of the rank
-/// (or square), from the given color's point of view.
-
-inline Bitboard behind_bb(Color c, Rank r) {
-  return InFrontBB[opposite_color(c)][r];
-}
-
-inline Bitboard behind_bb(Color c, Square s) {
-  return InFrontBB[opposite_color(c)][square_rank(s)];
-}
-
-
-/// ray_bb() gives a bitboard representing all squares along the ray in a
-/// given direction from a given square.
-
-inline Bitboard ray_bb(Square s, SignedDirection d) {
-  return RayBB[s][d];
+  return InFrontBB[c][rank_of(s)];
 }
 
 
@@ -227,36 +142,35 @@ inline Bitboard ray_bb(Square s, SignedDirection d) {
 
 #if defined(IS_64BIT)
 
-inline Bitboard rook_attacks_bb(Square s, Bitboard blockers) {
-  Bitboard b = blockers & RMask[s];
-  return RAttacks[RAttackIndex[s] + ((b * RMult[s]) >> RShift[s])];
+FORCE_INLINE unsigned rook_index(Square s, Bitboard occ) {
+  return unsigned(((occ & RMasks[s]) * RMagics[s]) >> RShifts[s]);
 }
 
-inline Bitboard bishop_attacks_bb(Square s, Bitboard blockers) {
-  Bitboard b = blockers & BMask[s];
-  return BAttacks[BAttackIndex[s] + ((b * BMult[s]) >> BShift[s])];
+FORCE_INLINE unsigned bishop_index(Square s, Bitboard occ) {
+  return unsigned(((occ & BMasks[s]) * BMagics[s]) >> BShifts[s]);
 }
 
 #else // if !defined(IS_64BIT)
 
-inline Bitboard rook_attacks_bb(Square s, Bitboard blockers) {
-  Bitboard b = blockers & RMask[s];
-  return RAttacks[RAttackIndex[s] +
-                  (unsigned(int(b) * int(RMult[s]) ^
-                            int(b >> 32) * int(RMult[s] >> 32))
-                   >> RShift[s])];
+FORCE_INLINE unsigned rook_index(Square s, Bitboard occ) {
+  Bitboard b = occ & RMasks[s];
+  return unsigned(int(b) * int(RMagics[s]) ^ int(b >> 32) * int(RMagics[s] >> 32)) >> RShifts[s];
 }
 
-inline Bitboard bishop_attacks_bb(Square s, Bitboard blockers) {
-  Bitboard b = blockers & BMask[s];
-  return BAttacks[BAttackIndex[s] +
-                  (unsigned(int(b) * int(BMult[s]) ^
-                            int(b >> 32) * int(BMult[s] >> 32))
-                   >> BShift[s])];
+FORCE_INLINE unsigned bishop_index(Square s, Bitboard occ) {
+  Bitboard b = occ & BMasks[s];
+  return unsigned(int(b) * int(BMagics[s]) ^ int(b >> 32) * int(BMagics[s] >> 32)) >> BShifts[s];
 }
-
 #endif
 
+inline Bitboard rook_attacks_bb(Square s, Bitboard occ) {
+  return RAttacks[s][rook_index(s, occ)];
+}
+
+inline Bitboard bishop_attacks_bb(Square s, Bitboard occ) {
+  return BAttacks[s][bishop_index(s, occ)];
+}
+
 inline Bitboard queen_attacks_bb(Square s, Bitboard blockers) {
   return rook_attacks_bb(s, blockers) | bishop_attacks_bb(s, blockers);
 }
@@ -282,14 +196,6 @@ inline Bitboard squares_in_front_of(Color c, Square s) {
 }
 
 
-/// squares_behind is similar to squares_in_front, but returns the squares
-/// behind the square instead of in front of the square.
-
-inline Bitboard squares_behind(Color c, Square s) {
-  return SquaresInFrontMask[opposite_color(c)][s];
-}
-
-
 /// passed_pawn_mask takes a color and a square as input, and returns a
 /// bitboard mask which can be used to test if a pawn of the given color on
 /// the given square is a passed pawn. Definition of the table is:
@@ -310,19 +216,47 @@ inline Bitboard attack_span_mask(Color c, Square s) {
 }
 
 
+/// squares_aligned returns true if the squares s1, s2 and s3 are aligned
+/// either on a straight or on a diagonal line.
+
+inline bool squares_aligned(Square s1, Square s2, Square s3) {
+  return  (BetweenBB[s1][s2] | BetweenBB[s1][s3] | BetweenBB[s2][s3])
+        & (    SetMaskBB[s1] |     SetMaskBB[s2] |     SetMaskBB[s3]);
+}
+
+
+/// same_color_squares() returns a bitboard representing all squares with
+/// the same color of the given square.
+
+inline Bitboard same_color_squares(Square s) {
+  return bit_is_set(0xAA55AA55AA55AA55ULL, s) ?  0xAA55AA55AA55AA55ULL
+                                              : ~0xAA55AA55AA55AA55ULL;
+}
+
+
 /// first_1() finds the least significant nonzero bit in a nonzero bitboard.
 /// pop_1st_bit() finds and clears the least significant nonzero bit in a
 /// nonzero bitboard.
 
-#if defined(USE_BSFQ) // Assembly code by Heinz van Saanen
+#if defined(USE_BSFQ)
 
-inline Square first_1(Bitboard b) {
+#if defined(_MSC_VER) && !defined(__INTEL_COMPILER)
+
+FORCE_INLINE Square first_1(Bitboard b) {
+   unsigned long index;
+   _BitScanForward64(&index, b);
+   return (Square) index;
+}
+#else
+
+FORCE_INLINE Square first_1(Bitboard b) { // Assembly code by Heinz van Saanen
   Bitboard dummy;
   __asm__("bsfq %1, %0": "=r"(dummy): "rm"(b) );
-  return (Square)(dummy);
+  return (Square) dummy;
 }
+#endif
 
-inline Square pop_1st_bit(Bitboard* b) {
+FORCE_INLINE Square pop_1st_bit(Bitboard* b) {
   const Square s = first_1(*b);
   *b &= ~(1ULL<<s);
   return s;
@@ -336,12 +270,7 @@ extern Square pop_1st_bit(Bitboard* b);
 #endif
 
 
-////
-//// Prototypes
-////
-
 extern void print_bitboard(Bitboard b);
-extern void init_bitboards();
-
+extern void bitboards_init();
 
 #endif // !defined(BITBOARD_H_INCLUDED)

src/bitcount.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -18,33 +18,32 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(BITCOUNT_H_INCLUDED)
 #define BITCOUNT_H_INCLUDED
 
+#include <cassert>
 #include "types.h"
 
-// Select type of intrinsic bit count instruction to use, see
-// README.txt on how to pgo compile with POPCNT support.
-#if !defined(USE_POPCNT)
-#define POPCNT_INTRINSIC(x) 0
-#elif defined(_MSC_VER)
-#define POPCNT_INTRINSIC(x) (int)__popcnt64(x)
-#elif defined(__GNUC__)
+enum BitCountType {
+  CNT_64,
+  CNT_64_MAX15,
+  CNT_32,
+  CNT_32_MAX15,
+  CNT_HW_POPCNT
+};
 
-#define POPCNT_INTRINSIC(x) ({ \
-   unsigned long __ret; \
-   __asm__("popcnt %1, %0" : "=r" (__ret) : "r" (x)); \
-   __ret; })
-
-#endif
+/// Determine at compile time the best popcount<> specialization according if
+/// platform is 32 or 64 bits, to the maximum number of nonzero bits to count or
+/// use hardware popcnt instruction when available.
+const BitCountType Full  = HasPopCnt ? CNT_HW_POPCNT : Is64Bit ? CNT_64 : CNT_32;
+const BitCountType Max15 = HasPopCnt ? CNT_HW_POPCNT : Is64Bit ? CNT_64_MAX15 : CNT_32_MAX15;
 
 
-/// Software implementation of bit count functions
+/// popcount() counts the number of nonzero bits in a bitboard
+template<BitCountType> inline int popcount(Bitboard);
 
-#if defined(IS_64BIT)
-
-inline int count_1s(Bitboard b) {
+template<>
+inline int popcount<CNT_64>(Bitboard b) {
   b -= ((b>>1) & 0x5555555555555555ULL);
   b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
   b = ((b>>4) + b) & 0x0F0F0F0F0F0F0F0FULL;
@@ -52,16 +51,16 @@ inline int count_1s(Bitboard b) {
   return int(b >> 56);
 }
 
-inline int count_1s_max_15(Bitboard b) {
+template<>
+inline int popcount<CNT_64_MAX15>(Bitboard b) {
   b -= (b>>1) & 0x5555555555555555ULL;
   b = ((b>>2) & 0x3333333333333333ULL) + (b & 0x3333333333333333ULL);
   b *= 0x1111111111111111ULL;
   return int(b >> 60);
 }
 
-#else // if !defined(IS_64BIT)
-
-inline int count_1s(Bitboard b) {
+template<>
+inline int popcount<CNT_32>(Bitboard b) {
   unsigned w = unsigned(b >> 32), v = unsigned(b);
   v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
   w -= (w >> 1) & 0x55555555;
@@ -73,7 +72,8 @@ inline int count_1s(Bitboard b) {
   return int(v >> 24);
 }
 
-inline int count_1s_max_15(Bitboard b) {
+template<>
+inline int popcount<CNT_32_MAX15>(Bitboard b) {
   unsigned w = unsigned(b >> 32), v = unsigned(b);
   v -= (v >> 1) & 0x55555555; // 0-2 in 2 bits
   w -= (w >> 1) & 0x55555555;
@@ -84,51 +84,29 @@ inline int count_1s_max_15(Bitboard b) {
   return int(v >> 28);
 }
 
-#endif // BITCOUNT
+template<>
+inline int popcount<CNT_HW_POPCNT>(Bitboard b) {
 
+#if !defined(USE_POPCNT)
 
-/// count_1s() counts the number of nonzero bits in a bitboard.
-/// If template parameter is true an intrinsic is called, otherwise
-/// we fallback on a software implementation.
+  assert(false);
+  return int(b != 0); // Avoid 'b not used' warning
 
-template<bool UseIntrinsic>
-inline int count_1s(Bitboard b) {
+#elif defined(_MSC_VER) && defined(__INTEL_COMPILER)
 
-  return UseIntrinsic ? POPCNT_INTRINSIC(b) : count_1s(b);
-}
+  return _mm_popcnt_u64(b);
 
-template<bool UseIntrinsic>
-inline int count_1s_max_15(Bitboard b) {
+#elif defined(_MSC_VER)
 
-  return UseIntrinsic ? POPCNT_INTRINSIC(b) : count_1s_max_15(b);
-}
+  return (int)__popcnt64(b);
 
-
-// Detect hardware POPCNT support
-inline bool cpu_has_popcnt() {
-
-  int CPUInfo[4] = {-1};
-  __cpuid(CPUInfo, 0x00000001);
-  return (CPUInfo[2] >> 23) & 1;
-}
-
-
-// Global constant initialized at startup that is set to true if
-// CPU on which application runs supports POPCNT intrinsic. Unless
-// USE_POPCNT is not defined.
-#if defined(USE_POPCNT)
-const bool CpuHasPOPCNT = cpu_has_popcnt();
 #else
-const bool CpuHasPOPCNT = false;
-#endif
 
+  unsigned long ret;
+  __asm__("popcnt %1, %0" : "=r" (ret) : "r" (b));
+  return ret;
 
-// Global constant used to print info about the use of 64 optimized
-// functions to verify that a 64 bit compile has been correctly built.
-#if defined(IS_64BIT)
-const bool CpuHas64BitPath = true;
-#else
-const bool CpuHas64BitPath = false;
 #endif
+}
 
 #endif // !defined(BITCOUNT_H_INCLUDED)

src/book.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,46 +17,26 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 /*
   The code in this file is based on the opening book code in PolyGlot
-  by Fabien Letouzey.  PolyGlot is available under the GNU General
+  by Fabien Letouzey. PolyGlot is available under the GNU General
   Public License, and can be downloaded from http://wbec-ridderkerk.nl
 */
 
-
-////
-//// Includes
-////
-
+#include <algorithm>
 #include <cassert>
+#include <iostream>
 
 #include "book.h"
-#include "mersenne.h"
+#include "misc.h"
 #include "movegen.h"
 
 using namespace std;
 
-////
-//// Global variables
-////
-
-Book OpeningBook;
-
-
-////
-//// Local definitions
-////
-
 namespace {
 
-  /// Book entry size in bytes
-  const int EntrySize = 16;
-
-
-  /// Random numbers from PolyGlot, used to compute book hash keys
-
-  const uint64_t Random64[781] = {
+  // Random numbers from PolyGlot, used to compute book hash keys
+  const Key PolyGlotRandoms[781] = {
     0x9D39247E33776D41ULL, 0x2AF7398005AAA5C7ULL, 0x44DB015024623547ULL,
     0x9C15F73E62A76AE2ULL, 0x75834465489C0C89ULL, 0x3290AC3A203001BFULL,
     0x0FBBAD1F61042279ULL, 0xE83A908FF2FB60CAULL, 0x0D7E765D58755C10ULL,
@@ -320,276 +300,188 @@ namespace {
     0xF8D626AAAF278509ULL
   };
 
+  // Offsets to the PolyGlotRandoms[] array of zobrist keys
+  const Key* ZobPiece     = PolyGlotRandoms +   0;
+  const Key* ZobCastle    = PolyGlotRandoms + 768;
+  const Key* ZobEnPassant = PolyGlotRandoms + 772;
+  const Key* ZobTurn      = PolyGlotRandoms + 780;
 
-  /// Indices to the Random64[] array
+  // PieceOffset is calculated as 64 * (PolyPiece ^ 1) where PolyPiece
+  // is: BP = 0, WP = 1, BN = 2, WN = 3 ... BK = 10, WK = 11
+  const int PieceOffset[] = { 0, 64, 192, 320, 448, 576, 704, 0,
+                              0,  0, 128, 256, 384, 512, 640 };
 
-  const int RandomPiece     = 0;
-  const int RandomCastle    = 768;
-  const int RandomEnPassant = 772;
-  const int RandomTurn      = 780;
+  // book_key() returns the PolyGlot hash key of the given position
+  uint64_t book_key(const Position& pos) {
+
+    uint64_t key = 0;
+    Bitboard b = pos.occupied_squares();
+
+    while (b)
+    {
+        Square s = pop_1st_bit(&b);
+        key ^= ZobPiece[PieceOffset[pos.piece_on(s)] + s];
+    }
+
+    b =  (pos.can_castle(WHITE_OO) << 0) | (pos.can_castle(WHITE_OOO) << 1)
+       | (pos.can_castle(BLACK_OO) << 2) | (pos.can_castle(BLACK_OOO) << 3);
+
+    while (b)
+        key ^= ZobCastle[pop_1st_bit(&b)];
+
+    if (pos.ep_square() != SQ_NONE)
+        key ^= ZobEnPassant[file_of(pos.ep_square())];
+
+    if (pos.side_to_move() == WHITE)
+        key ^= ZobTurn[0];
+
+    return key;
+  }
+
+} // namespace
+
+Book::Book() : size(0) {
+
+  for (int i = abs(system_time() % 10000); i > 0; i--)
+      RKiss.rand<unsigned>(); // Make random number generation less deterministic
+}
+
+Book::~Book() { if (is_open()) close(); }
 
 
-  /// Prototypes
+/// Book::operator>>() reads sizeof(T) chars from the file's binary byte stream
+/// and converts them in a number of type T. A Polyglot book stores numbers in
+/// big-endian format.
 
-  uint64_t book_key(const Position& pos);
-  uint64_t book_piece_key(Piece p, Square s);
-  uint64_t book_castle_key(const Position& pos);
-  uint64_t book_ep_key(const Position& pos);
-  uint64_t book_color_key(const Position& pos);
+template<typename T> Book& Book::operator>>(T& n) {
+
+  n = 0;
+  for (size_t i = 0; i < sizeof(T); i++)
+      n = T((n << 8) + ifstream::get());
+
+  return *this;
+}
+
+template<> Book& Book::operator>>(BookEntry& e) {
+  return *this >> e.key >> e.move >> e.count >> e.learn;
 }
 
 
-////
-//// Functions
-////
+/// Book::open() tries to open a book file with the given name after closing
+/// any exsisting one.
 
+bool Book::open(const char* fName) {
 
-/// Destructor. Be sure file is closed before we leave.
+  fileName = "";
 
-Book::~Book() {
+  if (is_open()) // Cannot close an already closed file
+      close();
 
-  close();
-}
+  ifstream::open(fName, ifstream::in | ifstream::binary | ios::ate);
 
-
-/// Book::open() opens a book file with a given file name
-
-void Book::open(const string& fName) {
-
-  // Close old file before opening the new
-  close();
-
-  fileName = fName;
-  ifstream::open(fileName.c_str(), ifstream::in | ifstream::binary);
   if (!is_open())
-      return;
+      return false; // Silently fail if the file is not found
 
-  // Get the book size in number of entries
-  seekg(0, ios::end);
-  bookSize = tellg() / EntrySize;
-  seekg(0, ios::beg);
+  // Get the book size in number of entries, we are already at the end of file
+  size = tellg() / sizeof(BookEntry);
 
   if (!good())
   {
-      cerr << "Failed to open book file " << fileName << endl;
-      Application::exit_with_failure();
+      cerr << "Failed to open book file " << fName << endl;
+      exit(EXIT_FAILURE);
   }
+
+  fileName = fName; // Set only if successful
+  return true;
 }
 
 
-/// Book::close() closes the file only if it is open, otherwise
-/// we can end up in a little mess due to how std::ifstream works.
+/// Book::probe() tries to find a book move for the given position. If no move
+/// is found returns MOVE_NONE. If pickBest is true returns always the highest
+/// rated move, otherwise randomly chooses one, based on the move score.
 
-void Book::close() {
+Move Book::probe(const Position& pos, const string& fName, bool pickBest) {
 
-  if (is_open())
-      ifstream::close();
-}
-
-
-/// Book::file_name() returns the file name of the currently active book,
-/// or the empty string if no book is open.
-
-const string Book::file_name() { // Not const to compile on HP-UX 11.X
-
-  return is_open() ? fileName : "";
-}
-
-
-/// Book::get_move() gets a book move for a given position. Returns
-/// MOVE_NONE if no book move is found.
-
-Move Book::get_move(const Position& pos, bool findBestMove) {
-
-  if (!is_open() || bookSize == 0)
-      return MOVE_NONE;
-
-  BookEntry entry;
-  int bookMove = MOVE_NONE;
-  int scoresSum = 0, bestScore = 0;
+  BookEntry e;
+  uint16_t best = 0;
+  unsigned sum = 0;
+  Move move = MOVE_NONE;
   uint64_t key = book_key(pos);
 
-  // Choose a book move among the possible moves for the given position
-  for (int idx = find_key(key); idx < bookSize; idx++)
-  {
-      read_entry(entry, idx);
-      if (entry.key != key)
-          break;
-
-      int score = entry.count;
-
-      assert(score > 0);
-
-      // If findBestMove is true choose highest rated book move
-      if (findBestMove)
-      {
-          if (score > bestScore)
-          {
-              bestScore = score;
-              bookMove = entry.move;
-          }
-          continue;
-      }
-
-      // Choose book move according to its score. If a move has a very
-      // high score it has more probability to be choosen then a one with
-      // lower score. Note that first entry is always chosen.
-      scoresSum += score;
-      if (int(genrand_int32() % scoresSum) < score)
-          bookMove = entry.move;
-  }
-  if (!bookMove)
+  if (fileName != fName && !open(fName.c_str()))
       return MOVE_NONE;
 
-  MoveStack mlist[256];
-  MoveStack* last = generate_moves(pos, mlist);
-  for (MoveStack* cur = mlist; cur != last; cur++)
-      if ((int(cur->move) & 07777) == bookMove)
-          return cur->move;
+  binary_search(key);
+
+  while (*this >> e, e.key == key && good())
+  {
+      best = max(best, e.count);
+      sum += e.count;
+
+      // Choose book move according to its score. If a move has a very
+      // high score it has higher probability to be choosen than a move
+      // with lower score. Note that first entry is always chosen.
+      if (   (RKiss.rand<unsigned>() % sum < e.count)
+          || (pickBest && e.count == best))
+          move = Move(e.move);
+  }
+
+  if (!move)
+      return MOVE_NONE;
+
+  // A PolyGlot book move is encoded as follows:
+  //
+  // bit  0- 5: destination square (from 0 to 63)
+  // bit  6-11: origin square (from 0 to 63)
+  // bit 12-14: promotion piece (from KNIGHT == 1 to QUEEN == 4)
+  //
+  // Castling moves follow "king captures rook" representation. So in case book
+  // move is a promotion we have to convert to our representation, in all the
+  // other cases we can directly compare with a Move after having masked out
+  // the special Move's flags (bit 14-15) that are not supported by PolyGlot.
+  int pt = (move >> 12) & 7;
+  if (pt)
+      move = make_promotion(from_sq(move), to_sq(move), PieceType(pt + 1));
+
+  // Add 'special move' flags and verify it is legal
+  for (MoveList<MV_LEGAL> ml(pos); !ml.end(); ++ml)
+      if (move == (ml.move() & 0x3FFF))
+          return ml.move();
 
   return MOVE_NONE;
 }
 
 
-/// Book::find_key() takes a book key as input, and does a binary search
-/// through the book file for the given key. The index to the first book
-/// entry with the same key as the input is returned. When the key is not
-/// found in the book file, bookSize is returned.
+/// Book::binary_search() takes a book key as input, and does a binary search
+/// through the book file for the given key. File stream current position is set
+/// to the leftmost book entry with the same key as the input.
 
-int Book::find_key(uint64_t key) {
+void Book::binary_search(uint64_t key) {
 
-  int left, right, mid;
-  BookEntry entry;
+  size_t low, high, mid;
+  BookEntry e;
 
-  // Binary search (finds the leftmost entry)
-  left = 0;
-  right = bookSize - 1;
+  low = 0;
+  high = size - 1;
 
-  assert(left <= right);
+  assert(low <= high);
 
-  while (left < right)
+  while (low < high && good())
   {
-      mid = (left + right) / 2;
+      mid = (low + high) / 2;
 
-      assert(mid >= left && mid < right);
+      assert(mid >= low && mid < high);
 
-      read_entry(entry, mid);
-      if (key <= entry.key)
-          right = mid;
+      seekg(mid * sizeof(BookEntry), ios_base::beg);
+      *this >> e;
+
+      if (key <= e.key)
+          high = mid;
       else
-          left = mid + 1;
+          low = mid + 1;
   }
 
-  assert(left == right);
+  assert(low == high);
 
-  read_entry(entry, left);
-  return (entry.key == key)? left : bookSize;
-}
-
-
-/// Book::read_entry() takes a BookEntry reference and an integer index as
-/// input, and looks up the opening book entry at the given index in the book
-/// file. The book entry is copied to the first input parameter.
-
-void Book::read_entry(BookEntry& entry, int idx) {
-
-  assert(idx >= 0 && idx < bookSize);
-  assert(is_open());
-
-  seekg(idx * EntrySize, ios_base::beg);
-  *this >> entry;
-  if (!good())
-  {
-      cerr << "Failed to read book entry at index " << idx << endl;
-      Application::exit_with_failure();
-  }
-}
-
-
-/// Book::read_integer() reads size chars from the file stream
-/// and converts them in an integer number.
-
-uint64_t Book::read_integer(int size) {
-
-  char buf[8];
-  read(buf, size);
-
-  // Numbers are stored on disk as a binary byte stream
-  uint64_t n = 0ULL;
-  for (int i = 0; i < size; i++)
-      n = (n << 8) + (unsigned char)buf[i];
-
-  return n;
-}
-
-
-////
-//// Local definitions
-////
-
-namespace {
-
-  uint64_t book_key(const Position& pos) {
-
-    uint64_t result = 0ULL;
-
-    for (Color c = WHITE; c <= BLACK; c++)
-    {
-        Bitboard b = pos.pieces_of_color(c);
-
-        while (b)
-        {
-            Square s = pop_1st_bit(&b);
-            Piece p = pos.piece_on(s);
-
-            assert(piece_is_ok(p));
-            assert(color_of_piece(p) == c);
-
-            result ^= book_piece_key(p, s);
-        }
-    }
-    result ^= book_castle_key(pos);
-    result ^= book_ep_key(pos);
-    result ^= book_color_key(pos);
-    return result;
-  }
-
-
-  uint64_t book_piece_key(Piece p, Square s) {
-
-    /// Convert pieces to the range 0..11
-    static const int PieceTo12[] = { 0, 0, 2, 4, 6, 8, 10, 0, 0, 1, 3, 5, 7, 9, 11 };
-
-    return Random64[RandomPiece + (PieceTo12[int(p)]^1) * 64 + int(s)];
-  }
-
-
-  uint64_t book_castle_key(const Position& pos) {
-
-    uint64_t result = 0ULL;
-
-    if (pos.can_castle_kingside(WHITE))
-        result ^= Random64[RandomCastle+0];
-
-    if (pos.can_castle_queenside(WHITE))
-        result ^= Random64[RandomCastle+1];
-
-    if (pos.can_castle_kingside(BLACK))
-        result ^= Random64[RandomCastle+2];
-
-    if (pos.can_castle_queenside(BLACK))
-        result ^= Random64[RandomCastle+3];
-
-    return result;
-  }
-
-
-  uint64_t book_ep_key(const Position& pos) {
-    return (pos.ep_square() == SQ_NONE ? 0ULL : Random64[RandomEnPassant + square_file(pos.ep_square())]);
-  }
-
-
-  uint64_t book_color_key(const Position& pos) {
-    return (pos.side_to_move() == WHITE ? Random64[RandomTurn] : 0ULL);
-  }
+  seekg(low * sizeof(BookEntry), ios_base::beg);
 }

src/book.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,71 +17,42 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-/*
-  The code in this file is based on the opening book code in PolyGlot
-  by Fabien Letouzey.  PolyGlot is available under the GNU General
-  Public License, and can be downloaded from http://wbec-ridderkerk.nl
-*/
-
-
 #if !defined(BOOK_H_INCLUDED)
 #define BOOK_H_INCLUDED
 
-
-////
-//// Includes
-////
-
 #include <fstream>
 #include <string>
 
-#include "move.h"
 #include "position.h"
+#include "rkiss.h"
 
 
-////
-//// Types
-////
-
+/// A Polyglot book is a series of "entries" of 16 bytes. All integers are
+/// stored highest byte first (regardless of size). The entries are ordered
+/// according to key. Lowest key first.
 struct BookEntry {
   uint64_t key;
   uint16_t move;
   uint16_t count;
-  uint16_t n;
-  uint16_t sum;
+  uint32_t learn;
 };
 
+
 class Book : private std::ifstream {
-  Book(const Book&); // just decleared..
-  Book& operator=(const Book&); // ..to avoid a warning
 public:
-  Book() {}
+  Book();
   ~Book();
-  void open(const std::string& fName);
-  void close();
-  const std::string file_name();
-  Move get_move(const Position& pos, bool findBestMove);
+  Move probe(const Position& pos, const std::string& fName, bool pickBest);
 
 private:
-  Book& operator>>(uint64_t& n) { n = read_integer(8); return *this; }
-  Book& operator>>(uint16_t& n) { n = (uint16_t)read_integer(2); return *this; }
-  void operator>>(BookEntry& e) { *this >> e.key >> e.move >> e.count >> e.n >> e.sum; }
+  template<typename T> Book& operator>>(T& n);
 
-  uint64_t read_integer(int size);
-  void read_entry(BookEntry& e, int n);
-  int find_key(uint64_t key);
+  bool open(const char* fName);
+  void binary_search(uint64_t key);
 
+  RKISS RKiss;
   std::string fileName;
-  int bookSize;
+  size_t size;
 };
 
-
-////
-//// Global variables
-////
-
-extern Book OpeningBook;
-
-
 #endif // !defined(BOOK_H_INCLUDED)

src/color.h

@@ -1,50 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(COLOR_H_INCLUDED)
-#define COLOR_H_INCLUDED
-
-
-////
-//// Types
-////
-
-enum Color {
-  WHITE,
-  BLACK,
-  COLOR_NONE
-};
-
-
-////
-//// Inline functions
-////
-
-inline void operator++ (Color &c, int) { c = Color(int(c) + 1); }
-
-inline Color opposite_color(Color c) {
-  return Color(int(c) ^ 1);
-}
-
-inline bool color_is_ok(Color c) {
-  return c == WHITE || c == BLACK;
-}
-
-#endif // !defined(COLOR_H_INCLUDED)

src/depth.h

@@ -1,61 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(DEPTH_H_INCLUDED)
-#define DEPTH_H_INCLUDED
-
-////
-//// Types
-////
-
-enum Depth {
-  DEPTH_ZERO = 0,
-  DEPTH_MAX = 200, // 100 * OnePly;
-  DEPTH_ENSURE_SIGNED = -1
-};
-
-
-////
-//// Constants
-////
-
-const Depth OnePly = Depth(2);
-
-
-////
-//// Inline functions
-////
-
-inline Depth operator+ (Depth d, int i) { return Depth(int(d) + i); }
-inline Depth operator+ (Depth d1, Depth d2) { return Depth(int(d1) + int(d2)); }
-inline void operator+= (Depth &d, int i) { d = Depth(int(d) + i); }
-inline void operator+= (Depth &d1, Depth d2) { d1 += int(d2); }
-inline Depth operator- (Depth d, int i) { return Depth(int(d) - i); }
-inline Depth operator- (Depth d1, Depth d2) { return Depth(int(d1) - int(d2)); }
-inline void operator-= (Depth &d, int i) { d = Depth(int(d) - i); }
-inline void operator-= (Depth &d1, Depth d2) { d1 -= int(d2); }
-inline Depth operator* (Depth d, int i) { return Depth(int(d) * i); }
-inline Depth operator* (int i, Depth d) { return Depth(int(d) * i); }
-inline void operator*= (Depth &d, int i) { d = Depth(int(d) * i); }
-inline Depth operator/ (Depth d, int i) { return Depth(int(d) / i); }
-inline void operator/= (Depth &d, int i) { d = Depth(int(d) / i); }
-
-
-#endif // !defined(DEPTH_H_INCLUDED)

src/direction.cpp

@@ -1,87 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include "direction.h"
-#include "square.h"
-
-
-////
-//// Local definitions
-////
-
-namespace {
-
-  const SquareDelta directionToDelta[] = {
-      DELTA_E, DELTA_W, DELTA_N, DELTA_S, DELTA_NE, DELTA_SW, DELTA_NW, DELTA_SE
-  };
-
-  bool reachable(Square orig, Square dest, SignedDirection dir) {
-
-    SquareDelta delta = directionToDelta[dir];
-    Square from = orig;
-    Square to = from + delta;
-    while (to != dest && square_distance(to, from) == 1 && square_is_ok(to))
-    {
-        from = to;
-        to += delta;
-    }
-    return (to == dest && square_distance(from, to) == 1);
-  }
-
-}
-
-
-////
-//// Variables
-////
-
-uint8_t DirectionTable[64][64];
-uint8_t SignedDirectionTable[64][64];
-
-
-////
-//// Functions
-////
-
-void init_direction_table() {
-
-  for (Square s1 = SQ_A1; s1 <= SQ_H8; s1++)
-      for (Square s2 = SQ_A1; s2 <= SQ_H8; s2++)
-      {
-          DirectionTable[s1][s2] = uint8_t(DIR_NONE);
-          SignedDirectionTable[s1][s2] = uint8_t(SIGNED_DIR_NONE);
-          if (s1 == s2)
-              continue;
-
-          for (SignedDirection d = SIGNED_DIR_E; d != SIGNED_DIR_NONE; d++)
-          {
-              if (reachable(s1, s2, d))
-              {
-                  SignedDirectionTable[s1][s2] = uint8_t(d);
-                  DirectionTable[s1][s2] = uint8_t(d / 2);
-                  break;
-              }
-          }
-      }
-}

src/direction.h

@@ -1,92 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(DIRECTION_H_INCLUDED)
-#define DIRECTION_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include "square.h"
-#include "types.h"
-
-
-////
-//// Types
-////
-
-enum Direction {
-  DIR_E = 0, DIR_N = 1, DIR_NE = 2, DIR_NW = 3, DIR_NONE = 4
-};
-
-enum SignedDirection {
-  SIGNED_DIR_E  = 0, SIGNED_DIR_W  = 1,
-  SIGNED_DIR_N  = 2, SIGNED_DIR_S  = 3,
-  SIGNED_DIR_NE = 4, SIGNED_DIR_SW = 5,
-  SIGNED_DIR_NW = 6, SIGNED_DIR_SE = 7,
-  SIGNED_DIR_NONE = 8
-};
-
-
-////
-//// Variables
-////
-
-extern uint8_t DirectionTable[64][64];
-extern uint8_t SignedDirectionTable[64][64];
-
-
-////
-//// Inline functions
-////
-
-inline void operator++ (Direction& d, int) {
-  d = Direction(int(d) + 1);
-}
-
-inline void operator++ (SignedDirection& d, int) {
-  d = SignedDirection(int(d) + 1);
-}
-
-inline Direction direction_between_squares(Square s1, Square s2) {
-  return Direction(DirectionTable[s1][s2]);
-}
-
-inline SignedDirection signed_direction_between_squares(Square s1, Square s2) {
-  return SignedDirection(SignedDirectionTable[s1][s2]);
-}
-
-inline int direction_is_diagonal(Square s1, Square s2) {
-  return DirectionTable[s1][s2] & 2;
-}
-
-inline bool direction_is_straight(Square s1, Square s2) {
-  return DirectionTable[s1][s2] < 2;
-}
-
-////
-//// Prototypes
-////
-
-extern void init_direction_table();
-
-
-#endif // !defined(DIRECTION_H_INCLUDED)

src/endgame.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,90 +17,104 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(ENDGAME_H_INCLUDED)
 #define ENDGAME_H_INCLUDED
 
-////
-//// Includes
-////
+#include <map>
+#include <string>
 
 #include "position.h"
-#include "scale.h"
-#include "value.h"
+#include "types.h"
 
 
-////
-//// Types
-////
+/// EndgameType lists all supported endgames
 
 enum EndgameType {
 
-    // Evaluation functions
-    KXK,   // Generic "mate lone king" eval
-    KBNK,  // KBN vs K
-    KPK,   // KP vs K
-    KRKP,  // KR vs KP
-    KRKB,  // KR vs KB
-    KRKN,  // KR vs KN
-    KQKR,  // KQ vs KR
-    KBBKN, // KBB vs KN
-    KNNK,  // KNN vs K
-    KmmKm, // K and two minors vs K and one or two minors
+  // Evaluation functions
 
-    // Scaling functions
-    KBPsK,   // KB+pawns vs K
-    KQKRPs,  // KQ vs KR+pawns
-    KRPKR,   // KRP vs KR
-    KRPPKRP, // KRPP vs KRP
-    KPsK,    // King and pawns vs king
-    KBPKB,   // KBP vs KB
-    KBPPKB,  // KBPP vs KB
-    KBPKN,   // KBP vs KN
-    KNPK,    // KNP vs K
-    KPKP     // KP vs KP
+  KXK,   // Generic "mate lone king" eval
+  KBNK,  // KBN vs K
+  KPK,   // KP vs K
+  KRKP,  // KR vs KP
+  KRKB,  // KR vs KB
+  KRKN,  // KR vs KN
+  KQKR,  // KQ vs KR
+  KBBKN, // KBB vs KN
+  KNNK,  // KNN vs K
+  KmmKm, // K and two minors vs K and one or two minors
+
+
+  // Scaling functions
+  SCALE_FUNS,
+
+  KBPsK,   // KB+pawns vs K
+  KQKRPs,  // KQ vs KR+pawns
+  KRPKR,   // KRP vs KR
+  KRPPKRP, // KRPP vs KRP
+  KPsK,    // King and pawns vs king
+  KBPKB,   // KBP vs KB
+  KBPPKB,  // KBPP vs KB
+  KBPKN,   // KBP vs KN
+  KNPK,    // KNP vs K
+  KPKP     // KP vs KP
 };
 
-/// Template abstract base class for all special endgame functions
+
+/// Some magic to detect family type of endgame from its enum value
+
+template<bool> struct bool_to_type { typedef Value type; };
+template<> struct bool_to_type<true> { typedef ScaleFactor type; };
+template<EndgameType E> struct eg_family : public bool_to_type<(E > SCALE_FUNS)> {};
+
+
+/// Base and derived templates for endgame evaluation and scaling functions
 
 template<typename T>
-class EndgameFunctionBase {
-public:
-  EndgameFunctionBase(Color c) : strongerSide(c), weakerSide(opposite_color(c)) {}
-  virtual ~EndgameFunctionBase() {}
-  virtual T apply(const Position&) const = 0;
-  Color color() const { return strongerSide; }
+struct EndgameBase {
 
-protected:
+  virtual ~EndgameBase() {}
+  virtual Color color() const = 0;
+  virtual T operator()(const Position&) const = 0;
+};
+
+
+template<EndgameType E, typename T = typename eg_family<E>::type>
+struct Endgame : public EndgameBase<T> {
+
+  explicit Endgame(Color c) : strongerSide(c), weakerSide(flip(c)) {}
+  Color color() const { return strongerSide; }
+  T operator()(const Position&) const;
+
+private:
   Color strongerSide, weakerSide;
 };
 
-typedef EndgameFunctionBase<Value> EndgameEvaluationFunctionBase;
-typedef EndgameFunctionBase<ScaleFactor> EndgameScalingFunctionBase;
 
+/// Endgames class stores in two std::map the pointers to endgame evaluation
+/// and scaling base objects. Then we use polymorphism to invoke the actual
+/// endgame function calling its operator() method that is virtual.
 
-/// Templates subclass for various concrete endgames
+class Endgames {
 
-template<EndgameType>
-struct EvaluationFunction : public EndgameEvaluationFunctionBase {
-  typedef EndgameEvaluationFunctionBase Base;
-  explicit EvaluationFunction(Color c): EndgameEvaluationFunctionBase(c) {}
-  Value apply(const Position&) const;
+  typedef std::map<Key, EndgameBase<Value>*> M1;
+  typedef std::map<Key, EndgameBase<ScaleFactor>*> M2;
+
+  M1 m1;
+  M2 m2;
+
+  M1& map(Value*) { return m1; }
+  M2& map(ScaleFactor*) { return m2; }
+
+  template<EndgameType E> void add(const std::string& code);
+
+public:
+  Endgames();
+  ~Endgames();
+
+  template<typename T> EndgameBase<T>* get(Key key) {
+    return map((T*)0).count(key) ? map((T*)0)[key] : NULL;
+  }
 };
 
-template<EndgameType>
-struct ScalingFunction : public EndgameScalingFunctionBase {
-  typedef EndgameScalingFunctionBase Base;
-  explicit ScalingFunction(Color c) : EndgameScalingFunctionBase(c) {}
-  ScaleFactor apply(const Position&) const;
-};
-
-
-////
-//// Prototypes
-////
-
-extern void init_bitbases();
-
-
 #endif // !defined(ENDGAME_H_INCLUDED)

src/evaluate.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,94 +17,15 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(EVALUATE_H_INCLUDED)
 #define EVALUATE_H_INCLUDED
 
-////
-//// Includes
-////
+#include "types.h"
 
-#include <iostream>
-
-#include "material.h"
-#include "pawns.h"
-
-
-////
-//// Types
-////
-
-
-/// The EvalInfo struct contains various information computed and collected
-/// by the evaluation function. An EvalInfo object is passed as one of the
-/// arguments to the evaluation function, and the search can make use of its
-/// contents to make intelligent search decisions.
-///
-/// At the moment, this is not utilized very much: The only part of the
-/// EvalInfo object which is used by the search is futilityMargin.
 class Position;
 
-struct EvalInfo {
-
-  EvalInfo() { kingDanger[0] = kingDanger[1] = Value(0); }
-
-  // Middle game and endgame evaluations
-  Score value;
-
-  // Pointers to material and pawn hash table entries
-  MaterialInfo* mi;
-  PawnInfo* pi;
-
-  // attackedBy[color][piece type] is a bitboard representing all squares
-  // attacked by a given color and piece type, attackedBy[color][0] contains
-  // all squares attacked by the given color.
-  Bitboard attackedBy[2][8];
-  Bitboard attacked_by(Color c) const { return attackedBy[c][0]; }
-  Bitboard attacked_by(Color c, PieceType pt) const { return attackedBy[c][pt]; }
-
-  // kingZone[color] is the zone around the enemy king which is considered
-  // by the king safety evaluation. This consists of the squares directly
-  // adjacent to the king, and the three (or two, for a king on an edge file)
-  // squares two ranks in front of the king. For instance, if black's king
-  // is on g8, kingZone[WHITE] is a bitboard containing the squares f8, h8,
-  // f7, g7, h7, f6, g6 and h6.
-  Bitboard kingZone[2];
-
-  // kingAttackersCount[color] is the number of pieces of the given color
-  // which attack a square in the kingZone of the enemy king.
-  int kingAttackersCount[2];
-
-  // kingAttackersWeight[color] is the sum of the "weight" of the pieces of the
-  // given color which attack a square in the kingZone of the enemy king. The
-  // weights of the individual piece types are given by the variables
-  // QueenAttackWeight, RookAttackWeight, BishopAttackWeight and
-  // KnightAttackWeight in evaluate.cpp
-  int kingAttackersWeight[2];
-
-  // kingAdjacentZoneAttacksCount[color] is the number of attacks to squares
-  // directly adjacent to the king of the given color. Pieces which attack
-  // more than one square are counted multiple times. For instance, if black's
-  // king is on g8 and there's a white knight on g5, this knight adds
-  // 2 to kingAdjacentZoneAttacksCount[BLACK].
-  int kingAdjacentZoneAttacksCount[2];
-
-  // Middle game and endgame mobility scores
-  Score mobility;
-
-  // Value of the danger for the king of the given color
-  Value kingDanger[2];
-};
-
-
-////
-//// Prototypes
-////
-
-extern Value evaluate(const Position& pos, EvalInfo& ei);
-extern void init_eval(int threads);
-extern void quit_eval();
-extern void read_weights(Color sideToMove);
-
+extern Value evaluate(const Position& pos, Value& margin);
+extern std::string trace_evaluate(const Position& pos);
+extern void read_evaluation_uci_options(Color sideToMove);
 
 #endif // !defined(EVALUATE_H_INCLUDED)

src/history.cpp

@@ -1,115 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include <cassert>
-#include <cstring>
-
-#include "history.h"
-
-
-////
-//// Functions
-////
-
-
-/// Constructor
-
-History::History() { clear(); }
-
-
-/// History::clear() clears the history tables
-
-void History::clear() {
-  memset(history, 0, 2 * 8 * 64 * sizeof(int));
-  memset(maxStaticValueDelta, 0, 2 * 8 * 64 * sizeof(int));
-}
-
-
-/// History::success() registers a move as being successful. This is done
-/// whenever a non-capturing move causes a beta cutoff in the main search.
-/// The three parameters are the moving piece, the destination square, and
-/// the search depth.
-
-void History::success(Piece p, Square to, Depth d) {
-
-  assert(piece_is_ok(p));
-  assert(square_is_ok(to));
-
-  history[p][to] += int(d) * int(d);
-
-  // Prevent history overflow
-  if (history[p][to] >= HistoryMax)
-      for (int i = 0; i < 16; i++)
-          for (int j = 0; j < 64; j++)
-              history[i][j] /= 2;
-}
-
-
-/// History::failure() registers a move as being unsuccessful. The function is
-/// called for each non-capturing move which failed to produce a beta cutoff
-/// at a node where a beta cutoff was finally found.
-
-void History::failure(Piece p, Square to, Depth d) {
-
-  assert(piece_is_ok(p));
-  assert(square_is_ok(to));
-
-  history[p][to] -= int(d) * int(d);
-
-  // Prevent history underflow
-  if (history[p][to] <= -HistoryMax)
-      for (int i = 0; i < 16; i++)
-          for (int j = 0; j < 64; j++)
-              history[i][j] /= 2;
-}
-
-
-/// History::move_ordering_score() returns an integer value used to order the
-/// non-capturing moves in the MovePicker class.
-
-int History::move_ordering_score(Piece p, Square to) const {
-
-  assert(piece_is_ok(p));
-  assert(square_is_ok(to));
-
-  return history[p][to];
-}
-
-
-/// History::set_gain() and History::gain() store and retrieve the
-/// gain of a move given the delta of the static position evaluations
-/// before and after the move.
-
-void History::set_gain(Piece p, Square to, Value delta)
-{
-  if (delta >= maxStaticValueDelta[p][to])
-      maxStaticValueDelta[p][to] = delta;
-  else
-      maxStaticValueDelta[p][to]--;
-}
-
-Value History::gain(Piece p, Square to) const
-{
-  return Value(maxStaticValueDelta[p][to]);
-}

src/history.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,23 +17,12 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(HISTORY_H_INCLUDED)
 #define HISTORY_H_INCLUDED
 
-////
-//// Includes
-////
-
-#include "depth.h"
-#include "move.h"
-#include "piece.h"
-#include "value.h"
-
-
-////
-//// Types
-////
+#include "types.h"
+#include <cstring>
+#include <algorithm>
 
 /// The History class stores statistics about how often different moves
 /// have been successful or unsuccessful during the current search. These
@@ -45,33 +34,38 @@
 class History {
 
 public:
-  History();
   void clear();
-  void success(Piece p, Square to, Depth d);
-  void failure(Piece p, Square to, Depth d);
-  int move_ordering_score(Piece p, Square to) const;
-  void set_gain(Piece p, Square to, Value delta);
+  Value value(Piece p, Square to) const;
+  void add(Piece p, Square to, Value bonus);
   Value gain(Piece p, Square to) const;
+  void update_gain(Piece p, Square to, Value g);
+
+  static const Value MaxValue = Value(2000);
 
 private:
-  int history[16][64];  // [piece][square]
-  int maxStaticValueDelta[16][64];  // [piece][from_square][to_square]
+  Value history[16][64];  // [piece][to_square]
+  Value maxGains[16][64]; // [piece][to_square]
 };
 
+inline void History::clear() {
+  memset(history,  0, 16 * 64 * sizeof(Value));
+  memset(maxGains, 0, 16 * 64 * sizeof(Value));
+}
 
-////
-//// Constants and variables
-////
+inline Value History::value(Piece p, Square to) const {
+  return history[p][to];
+}
 
-/// HistoryMax controls how often the history counters will be scaled down:
-/// When the history score for a move gets bigger than HistoryMax, all
-/// entries in the table are divided by 2. It is difficult to guess what
-/// the ideal value of this constant is. Scaling down the scores often has
-/// the effect that parts of the search tree which have been searched
-/// recently have a bigger importance for move ordering than the moves which
-/// have been searched a long time ago.
+inline void History::add(Piece p, Square to, Value bonus) {
+  if (abs(history[p][to] + bonus) < MaxValue) history[p][to] += bonus;
+}
 
-const int HistoryMax = 50000 * OnePly;
+inline Value History::gain(Piece p, Square to) const {
+  return maxGains[p][to];
+}
 
+inline void History::update_gain(Piece p, Square to, Value g) {
+  maxGains[p][to] = std::max(g, maxGains[p][to] - 1);
+}
 
 #endif // !defined(HISTORY_H_INCLUDED)

src/lock.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,85 +17,68 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(LOCK_H_INCLUDED)
 #define LOCK_H_INCLUDED
 
-
-// x86 assembly language locks or OS spin locks may perform faster than
-// mutex locks on some platforms. On my machine, mutexes seem to be the
-// best.
-
-//#define ASM_LOCK
-//#define OS_SPIN_LOCK
-
-
-#if defined(ASM_LOCK)
-
-
-typedef volatile int Lock;
-
-static inline void LockX86(Lock *lock) {
-  int dummy;
-  asm __volatile__("1:          movl    $1, %0" "\n\t"
-      "            xchgl   (%1), %0" "\n\t" "            testl   %0, %0" "\n\t"
-      "            jz      3f" "\n\t" "2:          pause" "\n\t"
-      "            movl    (%1), %0" "\n\t" "            testl   %0, %0" "\n\t"
-      "            jnz     2b" "\n\t" "            jmp     1b" "\n\t" "3:"
-      "\n\t":"=&q"(dummy)
-      :"q"(lock)
-      :"cc");
-}
-
-static inline void UnlockX86(Lock *lock) {
-  int dummy;
-  asm __volatile__("movl    $0, (%1)":"=&q"(dummy)
-      :"q"(lock));
-}
-
-#  define lock_init(x, y) (*(x) = 0)
-#  define lock_grab(x) LockX86(x)
-#  define lock_release(x) UnlockX86(x)
-#  define lock_destroy(x)
-
-
-#elif defined(OS_SPIN_LOCK)
-
-
-#  include <libkern/OSAtomic.h>
-
-typedef OSSpinLock Lock;
-
-#  define lock_init(x, y) (*(x) = 0)
-#  define lock_grab(x) OSSpinLockLock(x)
-#  define lock_release(x) OSSpinLockUnlock(x)
-#  define lock_destroy(x)
-
-
-#elif !defined(_MSC_VER)
+#if !defined(_MSC_VER)
 
 #  include <pthread.h>
 
 typedef pthread_mutex_t Lock;
+typedef pthread_cond_t WaitCondition;
 
-#  define lock_init(x, y) pthread_mutex_init(x, y)
+#  define lock_init(x) pthread_mutex_init(x, NULL)
 #  define lock_grab(x) pthread_mutex_lock(x)
 #  define lock_release(x) pthread_mutex_unlock(x)
 #  define lock_destroy(x) pthread_mutex_destroy(x)
-
+#  define cond_destroy(x) pthread_cond_destroy(x)
+#  define cond_init(x) pthread_cond_init(x, NULL)
+#  define cond_signal(x) pthread_cond_signal(x)
+#  define cond_wait(x,y) pthread_cond_wait(x,y)
+#  define cond_timedwait(x,y,z) pthread_cond_timedwait(x,y,z)
 
 #else
 
+#define NOMINMAX // disable macros min() and max()
 #define WIN32_LEAN_AND_MEAN
 #include <windows.h>
 #undef WIN32_LEAN_AND_MEAN
+#undef NOMINMAX
+
+// Default fast and race free locks and condition variables
+#if !defined(OLD_LOCKS)
+
+typedef SRWLOCK Lock;
+typedef CONDITION_VARIABLE WaitCondition;
+
+#  define lock_init(x) InitializeSRWLock(x)
+#  define lock_grab(x) AcquireSRWLockExclusive(x)
+#  define lock_release(x) ReleaseSRWLockExclusive(x)
+#  define lock_destroy(x) (x)
+#  define cond_destroy(x) (x)
+#  define cond_init(x) InitializeConditionVariable(x)
+#  define cond_signal(x) WakeConditionVariable(x)
+#  define cond_wait(x,y) SleepConditionVariableSRW(x,y,INFINITE,0)
+#  define cond_timedwait(x,y,z) SleepConditionVariableSRW(x,y,z,0)
+
+// Fallback solution to build for Windows XP and older versions, note that
+// cond_wait() is racy between lock_release() and WaitForSingleObject().
+#else
 
 typedef CRITICAL_SECTION Lock;
-#  define lock_init(x, y) InitializeCriticalSection(x)
+typedef HANDLE WaitCondition;
+
+#  define lock_init(x) InitializeCriticalSection(x)
 #  define lock_grab(x) EnterCriticalSection(x)
 #  define lock_release(x) LeaveCriticalSection(x)
 #  define lock_destroy(x) DeleteCriticalSection(x)
+#  define cond_init(x) { *x = CreateEvent(0, FALSE, FALSE, 0); }
+#  define cond_destroy(x) CloseHandle(*x)
+#  define cond_signal(x) SetEvent(*x)
+#  define cond_wait(x,y) { lock_release(y); WaitForSingleObject(*x, INFINITE); lock_grab(y); }
+#  define cond_timedwait(x,y,z) { lock_release(y); WaitForSingleObject(*x,z); lock_grab(y); }
 
+#endif
 
 #endif
 

src/main.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,75 +17,41 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-// To profile with callgrind uncomment following line
-//#define USE_CALLGRIND
-
-
-////
-//// Includes
-////
-
 #include <iostream>
 #include <string>
 
-#include "benchmark.h"
-#include "bitcount.h"
+#include "bitboard.h"
 #include "misc.h"
-#include "uci.h"
-
-#ifdef USE_CALLGRIND
-#include <valgrind/callgrind.h>
-#endif
+#include "position.h"
+#include "search.h"
+#include "thread.h"
 
 using namespace std;
 
+extern void uci_loop();
+extern void benchmark(int argc, char* argv[]);
+extern void kpk_bitbase_init();
 
-////
-//// Functions
-////
+int main(int argc, char* argv[]) {
 
-int main(int argc, char *argv[]) {
+  bitboards_init();
+  Position::init();
+  kpk_bitbase_init();
+  Search::init();
+  Threads.init();
 
-  // Disable IO buffering
-  cout.rdbuf()->pubsetbuf(NULL, 0);
-  cin.rdbuf()->pubsetbuf(NULL, 0);
+  cout << engine_info() << endl;
 
-  // Initialization through global resources manager
-  Application::initialize();
+  if (argc == 1)
+      uci_loop();
 
-#ifdef USE_CALLGRIND
-  CALLGRIND_START_INSTRUMENTATION;
-#endif
+  else if (string(argv[1]) == "bench")
+      benchmark(argc, argv);
 
-  if (argc <= 1)
-  {
-      // Print copyright notice
-      cout << engine_name()
-           << " by Tord Romstad, Marco Costalba, Joona Kiiski" << endl;
+  else
+      cerr << "\nUsage: stockfish bench [hash size = 128] [threads = 1] "
+           << "[limit = 12] [fen positions file = default] "
+           << "[limited by depth, time, nodes or perft = depth]" << endl;
 
-      if (CpuHasPOPCNT)
-          cout << "Good! CPU has hardware POPCNT." << endl;
-
-      // Enter UCI mode
-      uci_main_loop();
-  }
-  else // Process command line arguments
-  {
-      if (string(argv[1]) != "bench" || argc < 4 || argc > 8)
-          cout << "Usage: stockfish bench <hash size> <threads> "
-               << "[time = 60s] [fen positions file = default] "
-               << "[time, depth, perft or node limited = time] "
-               << "[timing file name = none]" << endl;
-      else
-      {
-          string time = argc > 4 ? argv[4] : "60";
-          string fen  = argc > 5 ? argv[5] : "default";
-          string lim  = argc > 6 ? argv[6] : "time";
-          string tim  = argc > 7 ? argv[7] : "";
-          benchmark(string(argv[2]) + " " + string(argv[3]) + " " + time + " " + fen + " " + lim + " " + tim);
-      }
-  }
-
-  Application::free_resources();
-  return 0;
+  Threads.exit();
 }

src/material.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,65 +17,56 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
 #include <cassert>
-#include <sstream>
-#include <map>
+#include <cstring>
+#include <algorithm>
 
 #include "material.h"
 
 using namespace std;
 
-
-////
-//// Local definitions
-////
-
 namespace {
 
   // Values modified by Joona Kiiski
   const Value MidgameLimit = Value(15581);
   const Value EndgameLimit = Value(3998);
 
+  // Scale factors used when one side has no more pawns
+  const int NoPawnsSF[4] = { 6, 12, 32 };
+
   // Polynomial material balance parameters
   const Value RedundantQueenPenalty = Value(320);
   const Value RedundantRookPenalty  = Value(554);
 
   const int LinearCoefficients[6] = { 1617, -162, -1172, -190, 105, 26 };
 
-  const int QuadraticCoefficientsSameColor[][6] = {
+  const int QuadraticCoefficientsSameColor[][8] = {
   { 7, 7, 7, 7, 7, 7 }, { 39, 2, 7, 7, 7, 7 }, { 35, 271, -4, 7, 7, 7 },
   { 7, 25, 4, 7, 7, 7 }, { -27, -2, 46, 100, 56, 7 }, { 58, 29, 83, 148, -3, -25 } };
 
-  const int QuadraticCoefficientsOppositeColor[][6] = {
+  const int QuadraticCoefficientsOppositeColor[][8] = {
   { 41, 41, 41, 41, 41, 41 }, { 37, 41, 41, 41, 41, 41 }, { 10, 62, 41, 41, 41, 41 },
   { 57, 64, 39, 41, 41, 41 }, { 50, 40, 23, -22, 41, 41 }, { 106, 101, 3, 151, 171, 41 } };
 
-  typedef EndgameEvaluationFunctionBase EF;
-  typedef EndgameScalingFunctionBase SF;
-
   // Endgame evaluation and scaling functions accessed direcly and not through
   // the function maps because correspond to more then one material hash key.
-  EvaluationFunction<KmmKm> EvaluateKmmKm[] = { EvaluationFunction<KmmKm>(WHITE), EvaluationFunction<KmmKm>(BLACK) };
-  EvaluationFunction<KXK>   EvaluateKXK[]   = { EvaluationFunction<KXK>(WHITE),   EvaluationFunction<KXK>(BLACK) };
-  ScalingFunction<KBPsK>    ScaleKBPsK[]    = { ScalingFunction<KBPsK>(WHITE),    ScalingFunction<KBPsK>(BLACK) };
-  ScalingFunction<KQKRPs>   ScaleKQKRPs[]   = { ScalingFunction<KQKRPs>(WHITE),   ScalingFunction<KQKRPs>(BLACK) };
-  ScalingFunction<KPsK>     ScaleKPsK[]     = { ScalingFunction<KPsK>(WHITE),     ScalingFunction<KPsK>(BLACK) };
-  ScalingFunction<KPKP>     ScaleKPKP[]     = { ScalingFunction<KPKP>(WHITE),     ScalingFunction<KPKP>(BLACK) };
+  Endgame<KmmKm> EvaluateKmmKm[] = { Endgame<KmmKm>(WHITE), Endgame<KmmKm>(BLACK) };
+  Endgame<KXK>   EvaluateKXK[]   = { Endgame<KXK>(WHITE),   Endgame<KXK>(BLACK) };
+
+  Endgame<KBPsK>  ScaleKBPsK[]  = { Endgame<KBPsK>(WHITE),  Endgame<KBPsK>(BLACK) };
+  Endgame<KQKRPs> ScaleKQKRPs[] = { Endgame<KQKRPs>(WHITE), Endgame<KQKRPs>(BLACK) };
+  Endgame<KPsK>   ScaleKPsK[]   = { Endgame<KPsK>(WHITE),   Endgame<KPsK>(BLACK) };
+  Endgame<KPKP>   ScaleKPKP[]   = { Endgame<KPKP>(WHITE),   Endgame<KPKP>(BLACK) };
 
   // Helper templates used to detect a given material distribution
   template<Color Us> bool is_KXK(const Position& pos) {
     const Color Them = (Us == WHITE ? BLACK : WHITE);
-    return   pos.non_pawn_material(Them) == Value(0)
+    return   pos.non_pawn_material(Them) == VALUE_ZERO
           && pos.piece_count(Them, PAWN) == 0
           && pos.non_pawn_material(Us)   >= RookValueMidgame;
   }
 
-  template<Color Us> bool is_KBPsK(const Position& pos) {
+  template<Color Us> bool is_KBPsKs(const Position& pos) {
     return   pos.non_pawn_material(Us)   == BishopValueMidgame
           && pos.piece_count(Us, BISHOP) == 1
           && pos.piece_count(Us, PAWN)   >= 1;
@@ -89,101 +80,26 @@ namespace {
           && pos.piece_count(Them, ROOK)  == 1
           && pos.piece_count(Them, PAWN)  >= 1;
   }
-}
+
+} // namespace
 
 
-////
-//// Classes
-////
+/// MaterialInfoTable c'tor and d'tor allocate and free the space for Endgames
 
-/// EndgameFunctions class stores endgame evaluation and scaling functions
-/// in two std::map. Because STL library is not guaranteed to be thread
-/// safe even for read access, the maps, although with identical content,
-/// are replicated for each thread. This is faster then using locks.
-
-class EndgameFunctions {
-public:
-  EndgameFunctions();
-  ~EndgameFunctions();
-  template<class T> T* get(Key key) const;
-
-private:
-  template<class T> void add(const string& keyCode);
-
-  static Key buildKey(const string& keyCode);
-  static const string swapColors(const string& keyCode);
-
-  // Here we store two maps, for evaluate and scaling functions
-  pair<map<Key, EF*>, map<Key, SF*> > maps;
-
-  // Maps accessing functions returning const and non-const references
-  template<typename T> const map<Key, T*>& get() const { return maps.first; }
-  template<typename T> map<Key, T*>& get() { return maps.first; }
-};
-
-// Explicit specializations of a member function shall be declared in
-// the namespace of which the class template is a member.
-template<> const map<Key, SF*>&
-EndgameFunctions::get<SF>() const { return maps.second; }
-
-template<> map<Key, SF*>&
-EndgameFunctions::get<SF>() { return maps.second; }
+void MaterialInfoTable::init() { Base::init(); if (!funcs) funcs = new Endgames(); }
+MaterialInfoTable::~MaterialInfoTable() { delete funcs; }
 
 
-////
-//// Functions
-////
-
-/// MaterialInfoTable c'tor and d'tor, called once by each thread
-
-MaterialInfoTable::MaterialInfoTable(unsigned int numOfEntries) {
-
-  size = numOfEntries;
-  entries = new MaterialInfo[size];
-  funcs = new EndgameFunctions();
-
-  if (!entries || !funcs)
-  {
-      cerr << "Failed to allocate " << numOfEntries * sizeof(MaterialInfo)
-           << " bytes for material hash table." << endl;
-      Application::exit_with_failure();
-  }
-}
-
-MaterialInfoTable::~MaterialInfoTable() {
-
-  delete funcs;
-  delete [] entries;
-}
-
-
-/// MaterialInfoTable::game_phase() calculates the phase given the current
-/// position. Because the phase is strictly a function of the material, it
-/// is stored in MaterialInfo.
-
-Phase MaterialInfoTable::game_phase(const Position& pos) {
-
-  Value npm = pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK);
-
-  if (npm >= MidgameLimit)
-      return PHASE_MIDGAME;
-  else if (npm <= EndgameLimit)
-      return PHASE_ENDGAME;
-
-  return Phase(((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit));
-}
-
-/// MaterialInfoTable::get_material_info() takes a position object as input,
+/// MaterialInfoTable::material_info() takes a position object as input,
 /// computes or looks up a MaterialInfo object, and returns a pointer to it.
 /// If the material configuration is not already present in the table, it
 /// is stored there, so we don't have to recompute everything when the
 /// same material configuration occurs again.
 
-MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
+MaterialInfo* MaterialInfoTable::material_info(const Position& pos) const {
 
-  Key key = pos.get_material_key();
-  int index = key & (size - 1);
-  MaterialInfo* mi = entries + index;
+  Key key = pos.material_key();
+  MaterialInfo* mi = probe(key);
 
   // If mi->key matches the position's material hash key, it means that we
   // have analysed this material configuration before, and we can simply
@@ -191,9 +107,10 @@ MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
   if (mi->key == key)
       return mi;
 
-  // Clear the MaterialInfo object, and set its key
-  mi->clear();
+  // Initialize MaterialInfo entry
+  memset(mi, 0, sizeof(MaterialInfo));
   mi->key = key;
+  mi->factor[WHITE] = mi->factor[BLACK] = (uint8_t)SCALE_FACTOR_NORMAL;
 
   // Store game phase
   mi->gamePhase = MaterialInfoTable::game_phase(pos);
@@ -201,17 +118,22 @@ MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
   // Let's look if we have a specialized evaluation function for this
   // particular material configuration. First we look for a fixed
   // configuration one, then a generic one if previous search failed.
-  if ((mi->evaluationFunction = funcs->get<EF>(key)) != NULL)
+  if ((mi->evaluationFunction = funcs->get<Value>(key)) != NULL)
       return mi;
 
-  else if (is_KXK<WHITE>(pos) || is_KXK<BLACK>(pos))
+  if (is_KXK<WHITE>(pos))
   {
-      mi->evaluationFunction = is_KXK<WHITE>(pos) ? &EvaluateKXK[WHITE] : &EvaluateKXK[BLACK];
+      mi->evaluationFunction = &EvaluateKXK[WHITE];
       return mi;
   }
-  else if (   pos.pieces(PAWN)  == EmptyBoardBB
-           && pos.pieces(ROOK)  == EmptyBoardBB
-           && pos.pieces(QUEEN) == EmptyBoardBB)
+
+  if (is_KXK<BLACK>(pos))
+  {
+      mi->evaluationFunction = &EvaluateKXK[BLACK];
+      return mi;
+  }
+
+  if (!pos.pieces(PAWN) && !pos.pieces(ROOK) && !pos.pieces(QUEEN))
   {
       // Minor piece endgame with at least one minor piece per side and
       // no pawns. Note that the case KmmK is already handled by KXK.
@@ -221,7 +143,7 @@ MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
       if (   pos.piece_count(WHITE, BISHOP) + pos.piece_count(WHITE, KNIGHT) <= 2
           && pos.piece_count(BLACK, BISHOP) + pos.piece_count(BLACK, KNIGHT) <= 2)
       {
-          mi->evaluationFunction = &EvaluateKmmKm[WHITE];
+          mi->evaluationFunction = &EvaluateKmmKm[pos.side_to_move()];
           return mi;
       }
   }
@@ -231,9 +153,9 @@ MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
   //
   // We face problems when there are several conflicting applicable
   // scaling functions and we need to decide which one to use.
-  SF* sf;
+  EndgameBase<ScaleFactor>* sf;
 
-  if ((sf = funcs->get<SF>(key)) != NULL)
+  if ((sf = funcs->get<ScaleFactor>(key)) != NULL)
   {
       mi->scalingFunction[sf->color()] = sf;
       return mi;
@@ -242,10 +164,10 @@ MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
   // Generic scaling functions that refer to more then one material
   // distribution. Should be probed after the specialized ones.
   // Note that these ones don't return after setting the function.
-  if (is_KBPsK<WHITE>(pos))
+  if (is_KBPsKs<WHITE>(pos))
       mi->scalingFunction[WHITE] = &ScaleKBPsK[WHITE];
 
-  if (is_KBPsK<BLACK>(pos))
+  if (is_KBPsKs<BLACK>(pos))
       mi->scalingFunction[BLACK] = &ScaleKBPsK[BLACK];
 
   if (is_KQKRPs<WHITE>(pos))
@@ -254,7 +176,10 @@ MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
   else if (is_KQKRPs<BLACK>(pos))
       mi->scalingFunction[BLACK] = &ScaleKQKRPs[BLACK];
 
-  if (pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK) == Value(0))
+  Value npm_w = pos.non_pawn_material(WHITE);
+  Value npm_b = pos.non_pawn_material(BLACK);
+
+  if (npm_w + npm_b == VALUE_ZERO)
   {
       if (pos.piece_count(BLACK, PAWN) == 0)
       {
@@ -275,156 +200,87 @@ MaterialInfo* MaterialInfoTable::get_material_info(const Position& pos) {
       }
   }
 
-  // Compute the space weight
-  if (pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK) >=
-      2*QueenValueMidgame + 4*RookValueMidgame + 2*KnightValueMidgame)
+  // No pawns makes it difficult to win, even with a material advantage
+  if (pos.piece_count(WHITE, PAWN) == 0 && npm_w - npm_b <= BishopValueMidgame)
   {
-      int minorPieceCount =  pos.piece_count(WHITE, KNIGHT)
-                           + pos.piece_count(BLACK, KNIGHT)
-                           + pos.piece_count(WHITE, BISHOP)
-                           + pos.piece_count(BLACK, BISHOP);
+      mi->factor[WHITE] = uint8_t
+      (npm_w == npm_b || npm_w < RookValueMidgame ? 0 : NoPawnsSF[std::min(pos.piece_count(WHITE, BISHOP), 2)]);
+  }
+
+  if (pos.piece_count(BLACK, PAWN) == 0 && npm_b - npm_w <= BishopValueMidgame)
+  {
+      mi->factor[BLACK] = uint8_t
+      (npm_w == npm_b || npm_b < RookValueMidgame ? 0 : NoPawnsSF[std::min(pos.piece_count(BLACK, BISHOP), 2)]);
+  }
+
+  // Compute the space weight
+  if (npm_w + npm_b >= 2 * QueenValueMidgame + 4 * RookValueMidgame + 2 * KnightValueMidgame)
+  {
+      int minorPieceCount =  pos.piece_count(WHITE, KNIGHT) + pos.piece_count(WHITE, BISHOP)
+                           + pos.piece_count(BLACK, KNIGHT) + pos.piece_count(BLACK, BISHOP);
 
       mi->spaceWeight = minorPieceCount * minorPieceCount;
   }
 
-  // Evaluate the material balance
-  const int pieceCount[2][6] = { { pos.piece_count(WHITE, BISHOP) > 1, pos.piece_count(WHITE, PAWN), pos.piece_count(WHITE, KNIGHT),
-                                   pos.piece_count(WHITE, BISHOP), pos.piece_count(WHITE, ROOK), pos.piece_count(WHITE, QUEEN) },
-                                 { pos.piece_count(BLACK, BISHOP) > 1, pos.piece_count(BLACK, PAWN), pos.piece_count(BLACK, KNIGHT),
-                                   pos.piece_count(BLACK, BISHOP), pos.piece_count(BLACK, ROOK), pos.piece_count(BLACK, QUEEN) } };
-  Color c, them;
-  int sign, pt1, pt2, pc;
-  int v, vv, matValue = 0;
+  // Evaluate the material imbalance. We use PIECE_TYPE_NONE as a place holder
+  // for the bishop pair "extended piece", this allow us to be more flexible
+  // in defining bishop pair bonuses.
+  const int pieceCount[2][8] = {
+  { pos.piece_count(WHITE, BISHOP) > 1, pos.piece_count(WHITE, PAWN), pos.piece_count(WHITE, KNIGHT),
+    pos.piece_count(WHITE, BISHOP)    , pos.piece_count(WHITE, ROOK), pos.piece_count(WHITE, QUEEN) },
+  { pos.piece_count(BLACK, BISHOP) > 1, pos.piece_count(BLACK, PAWN), pos.piece_count(BLACK, KNIGHT),
+    pos.piece_count(BLACK, BISHOP)    , pos.piece_count(BLACK, ROOK), pos.piece_count(BLACK, QUEEN) } };
 
-  for (c = WHITE, sign = 1; c <= BLACK; c++, sign = -sign)
-  {
-    // No pawns makes it difficult to win, even with a material advantage
-    if (   pos.piece_count(c, PAWN) == 0
-        && pos.non_pawn_material(c) - pos.non_pawn_material(opposite_color(c)) <= BishopValueMidgame)
-    {
-        if (   pos.non_pawn_material(c) == pos.non_pawn_material(opposite_color(c))
-            || pos.non_pawn_material(c) < RookValueMidgame)
-            mi->factor[c] = 0;
-        else
-        {
-            switch (pos.piece_count(c, BISHOP)) {
-            case 2:
-                mi->factor[c] = 32;
-                break;
-            case 1:
-                mi->factor[c] = 12;
-                break;
-            case 0:
-                mi->factor[c] = 6;
-                break;
-            }
-        }
-    }
-
-    // Redundancy of major pieces, formula based on Kaufman's paper
-    // "The Evaluation of Material Imbalances in Chess"
-    // http://mywebpages.comcast.net/danheisman/Articles/evaluation_of_material_imbalance.htm
-    if (pieceCount[c][ROOK] >= 1)
-        matValue -= sign * ((pieceCount[c][ROOK] - 1) * RedundantRookPenalty + pieceCount[c][QUEEN] * RedundantQueenPenalty);
-
-    them = opposite_color(c);
-    v = 0;
-
-    // Second-degree polynomial material imbalance by Tord Romstad
-    //
-    // We use NO_PIECE_TYPE as a place holder for the bishop pair "extended piece",
-    // this allow us to be more flexible in defining bishop pair bonuses.
-    for (pt1 = NO_PIECE_TYPE; pt1 <= QUEEN; pt1++)
-    {
-        pc = pieceCount[c][pt1];
-        if (!pc)
-            continue;
-
-        vv = LinearCoefficients[pt1];
-
-        for (pt2 = NO_PIECE_TYPE; pt2 <= pt1; pt2++)
-            vv +=  pieceCount[c][pt2] * QuadraticCoefficientsSameColor[pt1][pt2]
-                 + pieceCount[them][pt2] * QuadraticCoefficientsOppositeColor[pt1][pt2];
-
-        v += pc * vv;
-    }
-    matValue += sign * v;
-  }
-  mi->value = int16_t(matValue / 16);
+  mi->value = int16_t((imbalance<WHITE>(pieceCount) - imbalance<BLACK>(pieceCount)) / 16);
   return mi;
 }
 
 
-/// EndgameFunctions member definitions.
+/// MaterialInfoTable::imbalance() calculates imbalance comparing piece count of each
+/// piece type for both colors.
 
-EndgameFunctions::EndgameFunctions() {
+template<Color Us>
+int MaterialInfoTable::imbalance(const int pieceCount[][8]) {
 
-  add<EvaluationFunction<KNNK>  >("KNNK");
-  add<EvaluationFunction<KPK>   >("KPK");
-  add<EvaluationFunction<KBNK>  >("KBNK");
-  add<EvaluationFunction<KRKP>  >("KRKP");
-  add<EvaluationFunction<KRKB>  >("KRKB");
-  add<EvaluationFunction<KRKN>  >("KRKN");
-  add<EvaluationFunction<KQKR>  >("KQKR");
-  add<EvaluationFunction<KBBKN> >("KBBKN");
+  const Color Them = (Us == WHITE ? BLACK : WHITE);
 
-  add<ScalingFunction<KNPK>    >("KNPK");
-  add<ScalingFunction<KRPKR>   >("KRPKR");
-  add<ScalingFunction<KBPKB>   >("KBPKB");
-  add<ScalingFunction<KBPPKB>  >("KBPPKB");
-  add<ScalingFunction<KBPKN>   >("KBPKN");
-  add<ScalingFunction<KRPPKRP> >("KRPPKRP");
+  int pt1, pt2, pc, v;
+  int value = 0;
+
+  // Redundancy of major pieces, formula based on Kaufman's paper
+  // "The Evaluation of Material Imbalances in Chess"
+  if (pieceCount[Us][ROOK] > 0)
+      value -=  RedundantRookPenalty * (pieceCount[Us][ROOK] - 1)
+              + RedundantQueenPenalty * pieceCount[Us][QUEEN];
+
+  // Second-degree polynomial material imbalance by Tord Romstad
+  for (pt1 = NO_PIECE_TYPE; pt1 <= QUEEN; pt1++)
+  {
+      pc = pieceCount[Us][pt1];
+      if (!pc)
+          continue;
+
+      v = LinearCoefficients[pt1];
+
+      for (pt2 = NO_PIECE_TYPE; pt2 <= pt1; pt2++)
+          v +=  QuadraticCoefficientsSameColor[pt1][pt2] * pieceCount[Us][pt2]
+              + QuadraticCoefficientsOppositeColor[pt1][pt2] * pieceCount[Them][pt2];
+
+      value += pc * v;
+  }
+  return value;
 }
 
-EndgameFunctions::~EndgameFunctions() {
 
-    for (map<Key, EF*>::iterator it = maps.first.begin(); it != maps.first.end(); ++it)
-        delete (*it).second;
+/// MaterialInfoTable::game_phase() calculates the phase given the current
+/// position. Because the phase is strictly a function of the material, it
+/// is stored in MaterialInfo.
 
-    for (map<Key, SF*>::iterator it = maps.second.begin(); it != maps.second.end(); ++it)
-        delete (*it).second;
-}
-
-Key EndgameFunctions::buildKey(const string& keyCode) {
-
-    assert(keyCode.length() > 0 && keyCode[0] == 'K');
-    assert(keyCode.length() < 8);
-
-    stringstream s;
-    bool upcase = false;
-
-    // Build up a fen string with the given pieces, note that
-    // the fen string could be of an illegal position.
-    for (size_t i = 0; i < keyCode.length(); i++)
-    {
-        if (keyCode[i] == 'K')
-            upcase = !upcase;
-
-        s << char(upcase? toupper(keyCode[i]) : tolower(keyCode[i]));
-    }
-    s << 8 - keyCode.length() << "/8/8/8/8/8/8/8 w -";
-    return Position(s.str(), 0).get_material_key();
-}
-
-const string EndgameFunctions::swapColors(const string& keyCode) {
-
-    // Build corresponding key for the opposite color: "KBPKN" -> "KNKBP"
-    size_t idx = keyCode.find("K", 1);
-    return keyCode.substr(idx) + keyCode.substr(0, idx);
-}
-
-template<class T>
-void EndgameFunctions::add(const string& keyCode) {
-
-  typedef typename T::Base F;
-
-  get<F>().insert(pair<Key, F*>(buildKey(keyCode), new T(WHITE)));
-  get<F>().insert(pair<Key, F*>(buildKey(swapColors(keyCode)), new T(BLACK)));
-}
-
-template<class T>
-T* EndgameFunctions::get(Key key) const {
-
-  typename map<Key, T*>::const_iterator it(get<T>().find(key));
-  return (it != get<T>().end() ? it->second : NULL);
+Phase MaterialInfoTable::game_phase(const Position& pos) {
+
+  Value npm = pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK);
+
+  return  npm >= MidgameLimit ? PHASE_MIDGAME
+        : npm <= EndgameLimit ? PHASE_ENDGAME
+        : Phase(((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit));
 }

src/material.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,22 +17,22 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(MATERIAL_H_INCLUDED)
 #define MATERIAL_H_INCLUDED
 
-////
-//// Includes
-////
-
 #include "endgame.h"
 #include "position.h"
-#include "scale.h"
+#include "tt.h"
+#include "types.h"
 
+const int MaterialTableSize = 8192;
+
+/// Game phase
+enum Phase {
+  PHASE_ENDGAME = 0,
+  PHASE_MIDGAME = 128
+};
 
-////
-//// Types
-////
 
 /// MaterialInfo is a class which contains various information about a
 /// material configuration. It contains a material balance evaluation,
@@ -49,8 +49,6 @@ class MaterialInfo {
   friend class MaterialInfoTable;
 
 public:
-  MaterialInfo() : key(0) { clear(); }
-
   Score material_value() const;
   ScaleFactor scale_factor(const Position& pos, Color c) const;
   int space_weight() const;
@@ -59,66 +57,34 @@ public:
   Value evaluate(const Position& pos) const;
 
 private:
-  inline void clear();
-
   Key key;
   int16_t value;
   uint8_t factor[2];
-  EndgameEvaluationFunctionBase* evaluationFunction;
-  EndgameScalingFunctionBase* scalingFunction[2];
+  EndgameBase<Value>* evaluationFunction;
+  EndgameBase<ScaleFactor>* scalingFunction[2];
   int spaceWeight;
   Phase gamePhase;
 };
 
-/// The MaterialInfoTable class represents a pawn hash table. It is basically
-/// just an array of MaterialInfo objects and a few methods for accessing these
-/// objects. The most important method is get_material_info, which looks up a
-/// position in the table and returns a pointer to a MaterialInfo object.
-class EndgameFunctions;
 
-class MaterialInfoTable {
+/// The MaterialInfoTable class represents a pawn hash table. The most important
+/// method is material_info(), which returns a pointer to a MaterialInfo object.
 
+class MaterialInfoTable : public SimpleHash<MaterialInfo, MaterialTableSize> {
 public:
-  MaterialInfoTable(unsigned numOfEntries);
   ~MaterialInfoTable();
-  MaterialInfo* get_material_info(const Position& pos);
-
+  void init();
+  MaterialInfo* material_info(const Position& pos) const;
   static Phase game_phase(const Position& pos);
 
 private:
-  unsigned size;
-  MaterialInfo* entries;
-  EndgameFunctions* funcs;
+  template<Color Us>
+  static int imbalance(const int pieceCount[][8]);
+
+  Endgames* funcs;
 };
 
 
-////
-//// Inline functions
-////
-
-
-/// MaterialInfo::material_value simply returns the material balance
-/// evaluation that is independent from game phase.
-
-inline Score MaterialInfo::material_value() const {
-
-  return make_score(value, value);
-}
-
-
-/// MaterialInfo::clear() resets a MaterialInfo object to an empty state,
-/// with all slots at their default values but the key.
-
-inline void MaterialInfo::clear() {
-
-  value = 0;
-  factor[WHITE] = factor[BLACK] = uint8_t(SCALE_FACTOR_NORMAL);
-  evaluationFunction = NULL;
-  scalingFunction[WHITE] = scalingFunction[BLACK] = NULL;
-  spaceWeight = 0;
-}
-
-
 /// MaterialInfo::scale_factor takes a position and a color as input, and
 /// returns a scale factor for the given color. We have to provide the
 /// position in addition to the color, because the scale factor need not
@@ -128,50 +94,31 @@ inline void MaterialInfo::clear() {
 
 inline ScaleFactor MaterialInfo::scale_factor(const Position& pos, Color c) const {
 
-  if (scalingFunction[c] != NULL)
-  {
-      ScaleFactor sf = scalingFunction[c]->apply(pos);
-      if (sf != SCALE_FACTOR_NONE)
-          return sf;
-  }
-  return ScaleFactor(factor[c]);
+  if (!scalingFunction[c])
+      return ScaleFactor(factor[c]);
+
+  ScaleFactor sf = (*scalingFunction[c])(pos);
+  return sf == SCALE_FACTOR_NONE ? ScaleFactor(factor[c]) : sf;
 }
 
+inline Value MaterialInfo::evaluate(const Position& pos) const {
+  return (*evaluationFunction)(pos);
+}
 
-/// MaterialInfo::space_weight() simply returns the weight for the space
-/// evaluation for this material configuration.
+inline Score MaterialInfo::material_value() const {
+  return make_score(value, value);
+}
 
 inline int MaterialInfo::space_weight() const {
-
   return spaceWeight;
 }
 
-/// MaterialInfo::game_phase() returns the game phase according
-/// to this material configuration.
-
 inline Phase MaterialInfo::game_phase() const {
-
   return gamePhase;
 }
 
-
-/// MaterialInfo::specialized_eval_exists decides whether there is a
-/// specialized evaluation function for the current material configuration,
-/// or if the normal evaluation function should be used.
-
 inline bool MaterialInfo::specialized_eval_exists() const {
-
   return evaluationFunction != NULL;
 }
 
-
-/// MaterialInfo::evaluate applies a specialized evaluation function
-/// to a given position object. It should only be called when
-/// specialized_eval_exists() returns 'true'.
-
-inline Value MaterialInfo::evaluate(const Position& pos) const {
-
-  return evaluationFunction->apply(pos);
-}
-
 #endif // !defined(MATERIAL_H_INCLUDED)

src/mersenne.cpp

@@ -1,171 +0,0 @@
-/*
-   A C-program for MT19937, with initialization improved 2002/1/26.
-   Coded by Takuji Nishimura and Makoto Matsumoto.
-
-   Before using, initialize the state by using init_genrand(seed)
-   or init_by_array(init_key, key_length).
-
-   Copyright (C) 1997 - 2002, Makoto Matsumoto and Takuji Nishimura,
-   All rights reserved.
-
-   Redistribution and use in source and binary forms, with or without
-   modification, are permitted provided that the following conditions
-   are met:
-
-     1. Redistributions of source code must retain the above copyright
-        notice, this list of conditions and the following disclaimer.
-
-     2. Redistributions in binary form must reproduce the above copyright
-        notice, this list of conditions and the following disclaimer in the
-        documentation and/or other materials provided with the distribution.
-
-     3. The names of its contributors may not be used to endorse or promote
-        products derived from this software without specific prior written
-        permission.
-
-   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-   "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
-   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
-   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
-   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
-   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
-   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
-   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
-   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-
-
-   Any feedback is very welcome.
-   http://www.math.sci.hiroshima-u.ac.jp/~m-mat/MT/emt.html
-   email: m-mat @ math.sci.hiroshima-u.ac.jp (remove space)
-*/
-
-#include "mersenne.h"
-
-namespace {
-
-  // Period parameters
-  const int N = 624;
-  const int M = 397;
-  const unsigned long MATRIX_A   = 0x9908b0dfUL; // Constant vector a
-  const unsigned long UPPER_MASK = 0x80000000UL; // Most significant w-r bits
-  const unsigned long LOWER_MASK = 0x7fffffffUL; // Least significant r bits
-
-  unsigned long mt[N]; // The array for the state vector
-  int mti = N + 1;     // mti == N+1 means mt[N] is not initialized
-
-  // Initializes mt[N] with a seed
-  void init_genrand(unsigned long s) {
-
-      mt[0]= s & 0xffffffffUL;
-      for (mti = 1; mti < N; mti++)
-      {
-          // See Knuth TAOCP Vol2. 3rd Ed. P.106 for multiplier.
-          // In the previous versions, MSBs of the seed affect
-          // only MSBs of the array mt[].
-          // 2002/01/09 modified by Makoto Matsumoto
-          mt[mti] = 1812433253UL * (mt[mti-1] ^ (mt[mti-1] >> 30)) + mti;
-          mt[mti] &= 0xffffffffUL; // For > 32 bit machines
-      }
-  }
-
-  // Initialize by an array with array-length
-  // init_key is the array for initializing keys
-  // key_length is its length
-  // slight change for C++, 2004/2/26
-  void init_by_array(unsigned long init_key[], int key_length) {
-
-      int i = 1;
-      int j = 0;
-      int k = (N > key_length ? N : key_length);
-
-      init_genrand(19650218UL);
-
-      for ( ; k; k--)
-      {
-          mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1664525UL)) + init_key[j] + j; // Non linear
-          mt[i] &= 0xffffffffUL; // For WORDSIZE > 32 machines
-          i++; j++;
-          if (i >= N)
-          {
-              mt[0] = mt[N-1];
-              i = 1;
-          }
-          if (j >= key_length)
-              j = 0;
-      }
-      for (k = N-1; k; k--)
-      {
-          mt[i] = (mt[i] ^ ((mt[i-1] ^ (mt[i-1] >> 30)) * 1566083941UL)) - i; // Non linear
-          mt[i] &= 0xffffffffUL; // For WORDSIZE > 32 machines
-          i++;
-          if (i >= N)
-          {
-              mt[0] = mt[N-1];
-              i = 1;
-          }
-      }
-      mt[0] = 0x80000000UL; // MSB is 1; assuring non-zero initial array
-  }
-
-} // namespace
-
-
-// Generates a random number on [0,0xffffffff]-interval
-uint32_t genrand_int32() {
-
-  unsigned long y;
-  static unsigned long mag01[2] = {0x0UL, MATRIX_A};
-  /* mag01[x] = x * MATRIX_A  for x=0,1 */
-
-  // Generate N words at one time
-  if (mti >= N)
-  {
-      int kk;
-
-      if (mti == N+1)           // If init_genrand() has not been called,
-          init_genrand(5489UL); // a default initial seed is used.
-
-      for (kk = 0; kk < N-M; kk++)
-      {
-          y = (mt[kk] & UPPER_MASK) | (mt[kk+1] & LOWER_MASK);
-          mt[kk] = mt[kk+M] ^ (y >> 1) ^ mag01[y & 0x1UL];
-      }
-      for ( ; kk < N-1; kk++)
-      {
-          y = (mt[kk] & UPPER_MASK) | (mt[kk+1] & LOWER_MASK);
-          mt[kk] = mt[kk+(M-N)] ^ (y >> 1) ^ mag01[y & 0x1UL];
-      }
-      y = (mt[N-1] & UPPER_MASK) | (mt[0] & LOWER_MASK);
-      mt[N-1] = mt[M-1] ^ (y >> 1) ^ mag01[y & 0x1UL];
-      mti = 0;
-  }
-
-  y = mt[mti++];
-
-  // Tempering
-  y ^= (y >> 11);
-  y ^= (y <<  7) & 0x9d2c5680UL;
-  y ^= (y << 15) & 0xefc60000UL;
-  y ^= (y >> 18);
-
-  return y;
-}
-
-uint64_t genrand_int64() {
-
-  uint64_t x, y;
-
-  x = genrand_int32();
-  y = genrand_int32();
-  return (x << 32) | y;
-}
-
-void init_mersenne() {
-
-  unsigned long init[4] = {0x123, 0x234, 0x345, 0x456};
-  unsigned long length = 4;
-
-  init_by_array(init, length);
-}

src/mersenne.h

@@ -1,40 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(MERSENNE_H_INCLUDED)
-#define MERSENNE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include "types.h"
-
-
-////
-//// Prototypes
-////
-
-extern uint32_t genrand_int32();
-extern uint64_t genrand_int64();
-extern void init_mersenne();
-
-
-#endif // !defined(MERSENNE_H_INCLUDED)

src/misc.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,12 +17,14 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#if defined(_MSC_VER)
 
-////
-//// Includes
-////
+#define _CRT_SECURE_NO_DEPRECATE
+#define NOMINMAX // disable macros min() and max()
+#include <windows.h>
+#include <sys/timeb.h>
 
-#if !defined(_MSC_VER)
+#else
 
 #  include <sys/time.h>
 #  include <sys/types.h>
@@ -31,18 +33,13 @@
 #     include <sys/pstat.h>
 #  endif
 
-#else
-
-#define _CRT_SECURE_NO_DEPRECATE
-#include <windows.h>
-#include <sys/timeb.h>
-
 #endif
 
 #if !defined(NO_PREFETCH)
 #  include <xmmintrin.h>
 #endif
 
+#include <algorithm>
 #include <cassert>
 #include <cstdio>
 #include <iomanip>
@@ -55,263 +52,153 @@
 
 using namespace std;
 
-/// Version number. If this is left empty, the current date (in the format
-/// YYMMDD) is used as a version number.
+/// Version number. If Version is left empty, then Tag plus current
+/// date (in the format YYMMDD) is used as a version number.
 
-static const string EngineVersion = "1.8";
-static const string AppName = "Stockfish";
-static const string AppTag  = "";
+static const string Version = "2.2.1";
+static const string Tag = "";
 
 
-////
-//// Variables
-////
+/// engine_info() returns the full name of the current Stockfish version.
+/// This will be either "Stockfish YYMMDD" (where YYMMDD is the date when
+/// the program was compiled) or "Stockfish <version number>", depending
+/// on whether Version is empty.
 
-bool Chess960;
+const string engine_info(bool to_uci) {
 
-uint64_t dbg_cnt0 = 0;
-uint64_t dbg_cnt1 = 0;
+  const string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
+  const string cpu64(Is64Bit ? " 64bit" : "");
+  const string popcnt(HasPopCnt ? " SSE4.2" : "");
 
-bool dbg_show_mean = false;
-bool dbg_show_hit_rate = false;
+  string month, day, year;
+  stringstream s, date(__DATE__); // From compiler, format is "Sep 21 2008"
 
+  if (Version.empty())
+  {
+      date >> month >> day >> year;
 
-////
-//// Functions
-////
+      s << "Stockfish " << Tag
+        << setfill('0') << " " << year.substr(2)
+        << setw(2) << (1 + months.find(month) / 4)
+        << setw(2) << day << cpu64 << popcnt;
+  }
+  else
+      s << "Stockfish " << Version << cpu64 << popcnt;
 
-void dbg_hit_on(bool b) {
-
-    assert(!dbg_show_mean);
-    dbg_show_hit_rate = true;
-    dbg_cnt0++;
-    if (b)
-        dbg_cnt1++;
-}
-
-void dbg_hit_on_c(bool c, bool b) {
-
-    if (c)
-        dbg_hit_on(b);
-}
-
-void dbg_before() {
-
-    assert(!dbg_show_mean);
-    dbg_show_hit_rate = true;
-    dbg_cnt0++;
-}
-
-void dbg_after() {
-
-    assert(!dbg_show_mean);
-    dbg_show_hit_rate = true;
-    dbg_cnt1++;
-}
-
-void dbg_mean_of(int v) {
-
-    assert(!dbg_show_hit_rate);
-    dbg_show_mean = true;
-    dbg_cnt0++;
-    dbg_cnt1 += v;
-}
-
-void dbg_print_hit_rate() {
-
-  cout << "Total " << dbg_cnt0 << " Hit " << dbg_cnt1
-       << " hit rate (%) " << (dbg_cnt1*100)/(dbg_cnt0 ? dbg_cnt0 : 1) << endl;
-}
-
-void dbg_print_mean() {
-
-  cout << "Total " << dbg_cnt0 << " Mean "
-       << (float)dbg_cnt1 / (dbg_cnt0 ? dbg_cnt0 : 1) << endl;
-}
-
-void dbg_print_hit_rate(ofstream& logFile) {
-
-  logFile << "Total " << dbg_cnt0 << " Hit " << dbg_cnt1
-          << " hit rate (%) " << (dbg_cnt1*100)/(dbg_cnt0 ? dbg_cnt0 : 1) << endl;
-}
-
-void dbg_print_mean(ofstream& logFile) {
-
-  logFile << "Total " << dbg_cnt0 << " Mean "
-          << (float)dbg_cnt1 / (dbg_cnt0 ? dbg_cnt0 : 1) << endl;
-}
-
-/// engine_name() returns the full name of the current Stockfish version.
-/// This will be either "Stockfish YYMMDD" (where YYMMDD is the date when the
-/// program was compiled) or "Stockfish <version number>", depending on whether
-/// the constant EngineVersion (defined in misc.h) is empty.
-
-const string engine_name() {
-
-  const string cpu64(CpuHas64BitPath ? " 64bit" : "");
-
-  if (!EngineVersion.empty())
-      return AppName + " " + EngineVersion + cpu64;
-
-  string date(__DATE__); // From compiler, format is "Sep 21 2008"
-  string months("Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec");
-
-  size_t mon = 1 + months.find(date.substr(0, 3)) / 4;
-
-  stringstream s;
-  string day = (date[4] == ' ' ? date.substr(5, 1) : date.substr(4, 2));
-
-  string name = AppName + " " + AppTag + " ";
-
-  s << name << date.substr(date.length() - 2) << setfill('0')
-    << setw(2) << mon << setw(2) << day << cpu64;
+  s << (to_uci ? "\nid author ": " by ")
+    << "Tord Romstad, Marco Costalba and Joona Kiiski";
 
   return s.str();
 }
 
 
-/// get_system_time() returns the current system time, measured in
-/// milliseconds.
+/// Debug functions used mainly to collect run-time statistics
 
-int get_system_time() {
+static uint64_t hits[2], means[2];
+
+void dbg_hit_on(bool b) { hits[0]++; if (b) hits[1]++; }
+void dbg_hit_on_c(bool c, bool b) { if (c) dbg_hit_on(b); }
+void dbg_mean_of(int v) { means[0]++; means[1] += v; }
+
+void dbg_print() {
+
+  if (hits[0])
+      cerr << "Total " << hits[0] << " Hits " << hits[1]
+           << " hit rate (%) " << 100 * hits[1] / hits[0] << endl;
+
+  if (means[0])
+      cerr << "Total " << means[0] << " Mean "
+           << (float)means[1] / means[0] << endl;
+}
+
+
+/// system_time() returns the current system time, measured in milliseconds
+
+int system_time() {
 
 #if defined(_MSC_VER)
-    struct _timeb t;
-    _ftime(&t);
-    return int(t.time*1000 + t.millitm);
+  struct _timeb t;
+  _ftime(&t);
+  return int(t.time * 1000 + t.millitm);
 #else
-    struct timeval t;
-    gettimeofday(&t, NULL);
-    return t.tv_sec*1000 + t.tv_usec/1000;
+  struct timeval t;
+  gettimeofday(&t, NULL);
+  return t.tv_sec * 1000 + t.tv_usec / 1000;
 #endif
 }
 
 
-/// cpu_count() tries to detect the number of CPU cores.
+/// cpu_count() tries to detect the number of CPU cores
 
-#if !defined(_MSC_VER)
+int cpu_count() {
+
+#if defined(_MSC_VER)
+  SYSTEM_INFO s;
+  GetSystemInfo(&s);
+  return std::min(int(s.dwNumberOfProcessors), MAX_THREADS);
+#else
 
 #  if defined(_SC_NPROCESSORS_ONLN)
-int cpu_count() {
-  return Min(sysconf(_SC_NPROCESSORS_ONLN), MAX_THREADS);
-}
+  return std::min((int)sysconf(_SC_NPROCESSORS_ONLN), MAX_THREADS);
 #  elif defined(__hpux)
-int cpu_count() {
   struct pst_dynamic psd;
   if (pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0) == -1)
       return 1;
-
-  return Min(psd.psd_proc_cnt, MAX_THREADS);
-}
+  return std::min((int)psd.psd_proc_cnt, MAX_THREADS);
 #  else
-int cpu_count() {
   return 1;
-}
 #  endif
 
+#endif
+}
+
+
+/// timed_wait() waits for msec milliseconds. It is mainly an helper to wrap
+/// conversion from milliseconds to struct timespec, as used by pthreads.
+
+void timed_wait(WaitCondition* sleepCond, Lock* sleepLock, int msec) {
+
+#if defined(_MSC_VER)
+  int tm = msec;
 #else
+  struct timeval t;
+  struct timespec abstime, *tm = &abstime;
 
-int cpu_count() {
-  SYSTEM_INFO s;
-  GetSystemInfo(&s);
-  return Min(s.dwNumberOfProcessors, MAX_THREADS);
-}
+  gettimeofday(&t, NULL);
 
+  abstime.tv_sec = t.tv_sec + (msec / 1000);
+  abstime.tv_nsec = (t.tv_usec + (msec % 1000) * 1000) * 1000;
+
+  if (abstime.tv_nsec > 1000000000LL)
+  {
+      abstime.tv_sec += 1;
+      abstime.tv_nsec -= 1000000000LL;
+  }
 #endif
 
-
-/*
-  From Beowulf, from Olithink
-*/
-#ifndef _WIN32
-/* Non-windows version */
-int Bioskey()
-{
-  fd_set          readfds;
-  struct timeval  timeout;
-
-  FD_ZERO(&readfds);
-  FD_SET(fileno(stdin), &readfds);
-  /* Set to timeout immediately */
-  timeout.tv_sec = 0;
-  timeout.tv_usec = 0;
-  select(16, &readfds, 0, 0, &timeout);
-
-  return (FD_ISSET(fileno(stdin), &readfds));
+  cond_timedwait(sleepCond, sleepLock, tm);
 }
 
-#else
-/* Windows-version */
-#include <windows.h>
-#include <conio.h>
-int Bioskey()
-{
-    static int      init = 0,
-                    pipe;
-    static HANDLE   inh;
-    DWORD           dw;
-    /* If we're running under XBoard then we can't use _kbhit() as the input
-     * commands are sent to us directly over the internal pipe */
-
-#if defined(FILE_CNT)
-    if (stdin->_cnt > 0)
-        return stdin->_cnt;
-#endif
-    if (!init) {
-        init = 1;
-        inh = GetStdHandle(STD_INPUT_HANDLE);
-        pipe = !GetConsoleMode(inh, &dw);
-        if (!pipe) {
-            SetConsoleMode(inh, dw & ~(ENABLE_MOUSE_INPUT | ENABLE_WINDOW_INPUT));
-            FlushConsoleInputBuffer(inh);
-        }
-    }
-    if (pipe) {
-        if (!PeekNamedPipe(inh, NULL, 0, NULL, &dw, NULL))
-            return 1;
-        return dw;
-    } else {
-        // Count the number of unread input records, including keyboard,
-        // mouse, and window-resizing input records.
-        GetNumberOfConsoleInputEvents(inh, &dw);
-        if (dw <= 0)
-            return 0;
-
-        // Read data from console without removing it from the buffer
-        INPUT_RECORD rec[256];
-        DWORD recCnt;
-        if (!PeekConsoleInput(inh, rec, Min(dw, 256), &recCnt))
-            return 0;
-
-        // Search for at least one keyboard event
-        for (DWORD i = 0; i < recCnt; i++)
-            if (rec[i].EventType == KEY_EVENT)
-                return 1;
-
-        return 0;
-    }
-}
-
-#endif
 
 /// prefetch() preloads the given address in L1/L2 cache. This is a non
 /// blocking function and do not stalls the CPU waiting for data to be
-/// loaded from RAM, that can be very slow.
+/// loaded from memory, that can be quite slow.
 #if defined(NO_PREFETCH)
+
 void prefetch(char*) {}
+
 #else
 
 void prefetch(char* addr) {
 
-#if defined(__INTEL_COMPILER) || defined(__ICL)
+#  if defined(__INTEL_COMPILER) || defined(__ICL)
    // This hack prevents prefetches to be optimized away by
    // Intel compiler. Both MSVC and gcc seems not affected.
    __asm__ ("");
-#endif
+#  endif
 
   _mm_prefetch(addr, _MM_HINT_T2);
   _mm_prefetch(addr+64, _MM_HINT_T2); // 64 bytes ahead
 }
 
 #endif
-

src/misc.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,65 +17,34 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(MISC_H_INCLUDED)
 #define MISC_H_INCLUDED
 
-
-////
-//// Includes
-////
-
 #include <fstream>
 #include <string>
 
-#include "application.h"
+#include "lock.h"
 #include "types.h"
 
-////
-//// Macros
-////
-
-#define Min(x, y) (((x) < (y))? (x) : (y))
-#define Max(x, y) (((x) < (y))? (y) : (x))
-
-
-////
-//// Variables
-////
-
-extern bool Chess960;
-
-
-////
-//// Prototypes
-////
-
-extern const std::string engine_name();
-extern int get_system_time();
+extern const std::string engine_info(bool to_uci = false);
+extern int system_time();
 extern int cpu_count();
-extern int Bioskey();
+extern void timed_wait(WaitCondition*, Lock*, int);
 extern void prefetch(char* addr);
 
-
-////
-//// Debug
-////
-
-extern bool dbg_show_mean;
-extern bool dbg_show_hit_rate;
-
-extern uint64_t dbg_cnt0;
-extern uint64_t dbg_cnt1;
-
 extern void dbg_hit_on(bool b);
 extern void dbg_hit_on_c(bool c, bool b);
-extern void dbg_before();
-extern void dbg_after();
 extern void dbg_mean_of(int v);
-extern void dbg_print_hit_rate();
-extern void dbg_print_mean();
-extern void dbg_print_hit_rate(std::ofstream& logFile);
-extern void dbg_print_mean(std::ofstream& logFile);
+extern void dbg_print();
+
+class Position;
+extern Move move_from_uci(const Position& pos, const std::string& str);
+extern const std::string move_to_uci(Move m, bool chess960);
+extern const std::string move_to_san(Position& pos, Move m);
+
+struct Log : public std::ofstream {
+  Log(const std::string& f = "log.txt") : std::ofstream(f.c_str(), std::ios::out | std::ios::app) {}
+ ~Log() { if (is_open()) close(); }
+};
 
 #endif // !defined(MISC_H_INCLUDED)

src/move.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,136 +17,143 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
 #include <cassert>
+#include <cstring>
+#include <string>
 
-#include "move.h"
-#include "piece.h"
+#include "movegen.h"
 #include "position.h"
 
+using std::string;
 
-////
-//// Functions
-////
+/// move_to_uci() converts a move to a string in coordinate notation
+/// (g1f3, a7a8q, etc.). The only special case is castling moves, where we
+/// print in the e1g1 notation in normal chess mode, and in e1h1 notation in
+/// Chess960 mode. Instead internally Move is coded as "king captures rook".
 
-/// move_from_string() takes a position and a string as input, and attempts to
-/// convert the string to a move, using simple coordinate notation (g1f3,
-/// a7a8q, etc.). In order to correctly parse en passant captures and castling
-/// moves, we need the position. This function is not robust, and expects that
-/// the input move is legal and correctly formatted.
+const string move_to_uci(Move m, bool chess960) {
 
-Move move_from_string(const Position& pos, const std::string& str) {
+  Square from = from_sq(m);
+  Square to = to_sq(m);
+  string promotion;
 
-  Square from, to;
-  Piece piece;
-  Color us = pos.side_to_move();
+  if (m == MOVE_NONE)
+      return "(none)";
 
-  if (str.length() < 4)
-      return MOVE_NONE;
+  if (m == MOVE_NULL)
+      return "0000";
 
-  // Read the from and to squares
-  from = square_from_string(str.substr(0, 2));
-  to = square_from_string(str.substr(2, 4));
+  if (is_castle(m) && !chess960)
+      to = from + (file_of(to) == FILE_H ? Square(2) : -Square(2));
 
-  // Find the moving piece
-  piece = pos.piece_on(from);
+  if (is_promotion(m))
+      promotion = char(tolower(piece_type_to_char(promotion_piece_type(m))));
 
-  // If the string has more than 4 characters, try to interpret the 5th
-  // character as a promotion
-  if (type_of_piece(piece) == PAWN && str.length() > 4)
-  {
-      switch (tolower(str[4])) {
-      case 'n':
-          return make_promotion_move(from, to, KNIGHT);
-      case 'b':
-          return make_promotion_move(from, to, BISHOP);
-      case 'r':
-          return make_promotion_move(from, to, ROOK);
-      case 'q':
-          return make_promotion_move(from, to, QUEEN);
-    }
-  }
-
-  if (piece == piece_of_color_and_type(us, KING))
-  {
-      // Is this a castling move? A king move is assumed to be a castling
-      // move if the destination square is occupied by a friendly rook, or
-      // if the distance between the source and destination squares is more
-      // than 1.
-      if (pos.piece_on(to) == piece_of_color_and_type(us, ROOK))
-          return make_castle_move(from, to);
-
-      else if (square_distance(from, to) > 1)
-      {
-          // This is a castling move, but we have to translate it to the
-          // internal "king captures rook" representation.
-          SquareDelta delta = (to > from ? DELTA_E : DELTA_W);
-          Square s = from + delta;
-          while (relative_rank(us, s) == RANK_1 && pos.piece_on(s) != piece_of_color_and_type(us, ROOK))
-              s += delta;
-
-          return (relative_rank(us, s) == RANK_1 ? make_castle_move(from, s) : MOVE_NONE);
-      }
-  }
-  else if (piece == piece_of_color_and_type(us, PAWN))
-  {
-      // En passant move? We assume that a pawn move is an en passant move
-      // without further testing if the destination square is epSquare.
-      if (to == pos.ep_square())
-          return make_ep_move(from, to);
-  }
-  return make_move(from, to);
+  return square_to_string(from) + square_to_string(to) + promotion;
 }
 
 
-/// move_to_string() converts a move to a string in coordinate notation
-/// (g1f3, a7a8q, etc.).  The only special case is castling moves, where we
-/// print in the e1g1 notation in normal chess mode, and in e1h1 notation in
-/// Chess960 mode.
+/// move_from_uci() takes a position and a string representing a move in
+/// simple coordinate notation and returns an equivalent Move if any.
+/// Moves are guaranteed to be legal.
 
-const std::string move_to_string(Move move) {
+Move move_from_uci(const Position& pos, const string& str) {
 
-  std::string str;
-  Square from = move_from(move);
-  Square to = move_to(move);
+  for (MoveList<MV_LEGAL> ml(pos); !ml.end(); ++ml)
+      if (str == move_to_uci(ml.move(), pos.is_chess960()))
+          return ml.move();
 
-  if (move == MOVE_NONE)
-      str = "(none)";
-  else if (move == MOVE_NULL)
-      str = "0000";
+  return MOVE_NONE;
+}
+
+
+/// move_to_san() takes a position and a move as input, where it is assumed
+/// that the move is a legal move for the position. The return value is
+/// a string containing the move in short algebraic notation.
+
+const string move_to_san(Position& pos, Move m) {
+
+  if (m == MOVE_NONE)
+      return "(none)";
+
+  if (m == MOVE_NULL)
+      return "(null)";
+
+  assert(is_ok(m));
+
+  Bitboard attackers;
+  bool ambiguousMove, ambiguousFile, ambiguousRank;
+  Square sq, from = from_sq(m);
+  Square to = to_sq(m);
+  PieceType pt = type_of(pos.piece_on(from));
+  string san;
+
+  if (is_castle(m))
+      san = (to_sq(m) < from_sq(m) ? "O-O-O" : "O-O");
   else
   {
-      if (!Chess960)
+      if (pt != PAWN)
       {
-          if (move_is_short_castle(move))
-              return (from == SQ_E1 ? "e1g1" : "e8g8");
+          san = piece_type_to_char(pt);
 
-          if (move_is_long_castle(move))
-              return (from == SQ_E1 ? "e1c1" : "e8c8");
+          // Disambiguation if we have more then one piece with destination 'to'
+          // note that for pawns is not needed because starting file is explicit.
+          attackers = pos.attackers_to(to) & pos.pieces(pt, pos.side_to_move());
+          clear_bit(&attackers, from);
+          ambiguousMove = ambiguousFile = ambiguousRank = false;
+
+          while (attackers)
+          {
+              sq = pop_1st_bit(&attackers);
+
+              // Pinned pieces are not included in the possible sub-set
+              if (!pos.pl_move_is_legal(make_move(sq, to), pos.pinned_pieces()))
+                  continue;
+
+              if (file_of(sq) == file_of(from))
+                  ambiguousFile = true;
+
+              if (rank_of(sq) == rank_of(from))
+                  ambiguousRank = true;
+
+              ambiguousMove = true;
+          }
+
+          if (ambiguousMove)
+          {
+              if (!ambiguousFile)
+                  san += file_to_char(file_of(from));
+              else if (!ambiguousRank)
+                  san += rank_to_char(rank_of(from));
+              else
+                  san += square_to_string(from);
+          }
+      }
+
+      if (pos.is_capture(m))
+      {
+          if (pt == PAWN)
+              san += file_to_char(file_of(from));
+
+          san += 'x';
+      }
+
+      san += square_to_string(to);
+
+      if (is_promotion(m))
+      {
+          san += '=';
+          san += piece_type_to_char(promotion_piece_type(m));
       }
-      str = square_to_string(from) + square_to_string(to);
-      if (move_is_promotion(move))
-          str += piece_type_to_char(move_promotion_piece(move), false);
   }
-  return str;
-}
-
-
-/// Overload the << operator, to make it easier to print moves.
-
-std::ostream &operator << (std::ostream& os, Move m) {
-
-  return os << move_to_string(m);
-}
-
-
-/// move_is_ok(), for debugging.
-
-bool move_is_ok(Move m) {
-
-  return square_is_ok(move_from(m)) && square_is_ok(move_to(m));
+
+  // The move gives check? We don't use pos.move_gives_check() here
+  // because we need to test for a mate after the move is done.
+  StateInfo st;
+  pos.do_move(m, st);
+  if (pos.in_check())
+      san += pos.is_mate() ? "#" : "+";
+  pos.undo_move(m);
+
+  return san;
 }

src/move.h

@@ -1,210 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(MOVE_H_INCLUDED)
-#define MOVE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include <iostream>
-
-#include "misc.h"
-#include "piece.h"
-#include "square.h"
-
-
-////
-//// Types
-////
-
-class Position;
-
-/// A move needs 17 bits to be stored
-///
-/// bit  0- 5: destination square (from 0 to 63)
-/// bit  6-11: origin square (from 0 to 63)
-/// bit 12-14: promotion piece type
-/// bit    15: en passant flag
-/// bit    16: castle flag
-///
-/// Special cases are MOVE_NONE and MOVE_NULL. We can sneak these in
-/// because in any normal move destination square is always different
-/// from origin square while MOVE_NONE and MOVE_NULL have the same
-/// origin and destination square, 0 and 1 respectively.
-
-enum Move {
-  MOVE_NONE = 0,
-  MOVE_NULL = 65
-};
-
-
-struct MoveStack {
-  Move move;
-  int score;
-};
-
-// Note that operator< is set up such that sorting will be in descending order
-inline bool operator<(const MoveStack& f, const MoveStack& s) { return s.score < f.score; }
-
-// An helper insertion sort implementation
-template<typename T>
-inline void insertion_sort(T* firstMove, T* lastMove)
-{
-    T value;
-    T *cur, *p, *d;
-
-    if (firstMove != lastMove)
-        for (cur = firstMove + 1; cur != lastMove; cur++)
-        {
-            p = d = cur;
-            value = *p--;
-            if (value < *p)
-            {
-                do *d = *p;
-                while (--d != firstMove && value < *--p);
-                *d = value;
-            }
-        }
-}
-
-// Our dedicated sort in range [firstMove, lastMove), first splits
-// positive scores from ramining then order seaprately the two sets.
-template<typename T>
-inline void sort_moves(T* firstMove, T* lastMove, T** lastPositive)
-{
-    T tmp;
-    T *p, *d;
-
-    d = lastMove;
-    p = firstMove - 1;
-
-    d->score = -1; // right guard
-
-    // Split positives vs non-positives
-    do {
-        while ((++p)->score > 0) {}
-
-        if (p != d)
-        {
-            while (--d != p && d->score <= 0) {}
-
-            tmp = *p;
-            *p = *d;
-            *d = tmp;
-        }
-
-    } while (p != d);
-
-    // Sort just positive scored moves, remaining only when we get there
-    insertion_sort<T>(firstMove, p);
-    *lastPositive = p;
-}
-
-// Picks up the best move in range [curMove, lastMove), one per cycle.
-// It is faster then sorting all the moves in advance when moves are few,
-// as normally are the possible captures. Note that is not a stable alghoritm.
-template<typename T>
-inline T pick_best(T* curMove, T* lastMove)
-{
-    T bestMove, tmp;
-
-    bestMove = *curMove;
-    while (++curMove != lastMove)
-    {
-        if (*curMove < bestMove)
-        {
-            tmp = *curMove;
-            *curMove = bestMove;
-            bestMove = tmp;
-        }
-    }
-    return bestMove;
-}
-
-////
-//// Inline functions
-////
-
-inline Square move_from(Move m) {
-  return Square((int(m) >> 6) & 0x3F);
-}
-
-inline Square move_to(Move m) {
-  return Square(m & 0x3F);
-}
-
-inline PieceType move_promotion_piece(Move m) {
-  return PieceType((int(m) >> 12) & 7);
-}
-
-inline int move_is_special(Move m) {
-  return m & (0x1F << 12);
-}
-
-inline int move_is_promotion(Move m) {
-  return m & (7 << 12);
-}
-
-inline int move_is_ep(Move m) {
-  return m & (1 << 15);
-}
-
-inline int move_is_castle(Move m) {
-  return m & (1 << 16);
-}
-
-inline bool move_is_short_castle(Move m) {
-  return move_is_castle(m) && (move_to(m) > move_from(m));
-}
-
-inline bool move_is_long_castle(Move m) {
-  return move_is_castle(m) && (move_to(m) < move_from(m));
-}
-
-inline Move make_promotion_move(Square from, Square to, PieceType promotion) {
-  return Move(int(to) | (int(from) << 6) | (int(promotion) << 12));
-}
-
-inline Move make_move(Square from, Square to) {
-  return Move(int(to) | (int(from) << 6));
-}
-
-inline Move make_castle_move(Square from, Square to) {
-  return Move(int(to) | (int(from) << 6) | (1 << 16));
-}
-
-inline Move make_ep_move(Square from, Square to) {
-  return Move(int(to) | (int(from) << 6) | (1 << 15));
-}
-
-
-////
-//// Prototypes
-////
-
-extern std::ostream& operator<<(std::ostream &os, Move m);
-extern Move move_from_string(const Position &pos, const std::string &str);
-extern const std::string move_to_string(Move m);
-extern bool move_is_ok(Move m);
-
-
-#endif // !defined(MOVE_H_INCLUDED)

src/movegen.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,15 +17,12 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
 #include <cassert>
+#include <algorithm>
 
 #include "bitcount.h"
 #include "movegen.h"
+#include "position.h"
 
 // Simple macro to wrap a very common while loop, no facny, no flexibility,
 // hardcoded list name 'mlist' and from square 'from'.
@@ -34,10 +31,6 @@
 // Version used for pawns, where the 'from' square is given as a delta from the 'to' square
 #define SERIALIZE_MOVES_D(b, d) while (b) { to = pop_1st_bit(&b); (*mlist++).move = make_move(to + (d), to); }
 
-////
-//// Local definitions
-////
-
 namespace {
 
   enum CastlingSide {
@@ -45,123 +38,178 @@ namespace {
     QUEEN_SIDE
   };
 
-  enum MoveType {
-    CAPTURE,
-    NON_CAPTURE,
-    CHECK,
-    EVASION
-  };
+  template<CastlingSide>
+  MoveStack* generate_castle_moves(const Position&, MoveStack*, Color us);
 
-  // Helper templates
-  template<CastlingSide Side>
-  MoveStack* generate_castle_moves(const Position&, MoveStack*);
-
-  template<Color Us, MoveType Type>
+  template<Color, MoveType>
   MoveStack* generate_pawn_moves(const Position&, MoveStack*, Bitboard, Square);
 
-  // Template generate_piece_moves (captures and non-captures) with specializations and overloads
-  template<PieceType>
-  MoveStack* generate_piece_moves(const Position&, MoveStack*, Color, Bitboard);
+  template<PieceType Pt>
+  inline MoveStack* generate_discovered_checks(const Position& pos, MoveStack* mlist, Square from) {
+
+    assert(Pt != QUEEN && Pt != PAWN);
+
+    Bitboard b = pos.attacks_from<Pt>(from) & pos.empty_squares();
+
+    if (Pt == KING)
+        b &= ~QueenPseudoAttacks[pos.king_square(flip(pos.side_to_move()))];
+
+    SERIALIZE_MOVES(b);
+    return mlist;
+  }
+
+  template<PieceType Pt>
+  inline MoveStack* generate_direct_checks(const Position& pos, MoveStack* mlist, Color us,
+                                           Bitboard dc, Square ksq) {
+    assert(Pt != KING && Pt != PAWN);
+
+    Bitboard checkSqs, b;
+    Square from;
+    const Square* pl = pos.piece_list(us, Pt);
+
+    if ((from = *pl++) == SQ_NONE)
+        return mlist;
+
+    checkSqs = pos.attacks_from<Pt>(ksq) & pos.empty_squares();
+
+    do
+    {
+        if (   (Pt == QUEEN  && !(QueenPseudoAttacks[from]  & checkSqs))
+            || (Pt == ROOK   && !(RookPseudoAttacks[from]   & checkSqs))
+            || (Pt == BISHOP && !(BishopPseudoAttacks[from] & checkSqs)))
+            continue;
+
+        if (dc && bit_is_set(dc, from))
+            continue;
+
+        b = pos.attacks_from<Pt>(from) & checkSqs;
+        SERIALIZE_MOVES(b);
+
+    } while ((from = *pl++) != SQ_NONE);
+
+    return mlist;
+  }
 
   template<>
-  MoveStack* generate_piece_moves<KING>(const Position&, MoveStack*, Color, Bitboard);
+  FORCE_INLINE MoveStack* generate_direct_checks<PAWN>(const Position& p, MoveStack* m, Color us, Bitboard dc, Square ksq) {
 
-  template<PieceType Piece, MoveType Type>
-  inline MoveStack* generate_piece_moves(const Position& p, MoveStack* m, Color us, Bitboard t) {
+    return (us == WHITE ? generate_pawn_moves<WHITE, MV_CHECK>(p, m, dc, ksq)
+                        : generate_pawn_moves<BLACK, MV_CHECK>(p, m, dc, ksq));
+  }
 
-    assert(Piece == PAWN);
-    assert(Type == CAPTURE || Type == NON_CAPTURE || Type == EVASION);
+  template<PieceType Pt, MoveType Type>
+  FORCE_INLINE MoveStack* generate_piece_moves(const Position& p, MoveStack* m, Color us, Bitboard t) {
 
+    assert(Pt == PAWN);
     return (us == WHITE ? generate_pawn_moves<WHITE, Type>(p, m, t, SQ_NONE)
                         : generate_pawn_moves<BLACK, Type>(p, m, t, SQ_NONE));
   }
 
-  // Templates for non-capture checks generation
+  template<PieceType Pt>
+  FORCE_INLINE MoveStack* generate_piece_moves(const Position& pos, MoveStack* mlist, Color us, Bitboard target) {
 
-  template<PieceType Piece>
-  MoveStack* generate_discovered_checks(const Position&, MoveStack*, Square);
+    Bitboard b;
+    Square from;
+    const Square* pl = pos.piece_list(us, Pt);
 
-  template<PieceType>
-  MoveStack* generate_direct_checks(const Position&, MoveStack*, Color, Bitboard, Square);
+    if (*pl != SQ_NONE)
+    {
+        do {
+            from = *pl;
+            b = pos.attacks_from<Pt>(from) & target;
+            SERIALIZE_MOVES(b);
+        } while (*++pl != SQ_NONE);
+    }
+    return mlist;
+  }
 
   template<>
-  inline MoveStack* generate_direct_checks<PAWN>(const Position& p, MoveStack* m, Color us, Bitboard dc, Square ksq) {
+  FORCE_INLINE MoveStack* generate_piece_moves<KING>(const Position& pos, MoveStack* mlist, Color us, Bitboard target) {
 
-    return (us == WHITE ? generate_pawn_moves<WHITE, CHECK>(p, m, dc, ksq)
-                        : generate_pawn_moves<BLACK, CHECK>(p, m, dc, ksq));
+    Bitboard b;
+    Square from = pos.king_square(us);
+
+    b = pos.attacks_from<KING>(from) & target;
+    SERIALIZE_MOVES(b);
+    return mlist;
   }
+
 }
 
 
-////
-//// Functions
-////
-
-
-/// generate_captures() generates all pseudo-legal captures and queen
+/// generate<MV_CAPTURE> generates all pseudo-legal captures and queen
 /// promotions. Returns a pointer to the end of the move list.
-
-MoveStack* generate_captures(const Position& pos, MoveStack* mlist) {
-
-  assert(pos.is_ok());
-  assert(!pos.is_check());
-
-  Color us = pos.side_to_move();
-  Bitboard target = pos.pieces_of_color(opposite_color(us));
-
-  mlist = generate_piece_moves<QUEEN>(pos, mlist, us, target);
-  mlist = generate_piece_moves<ROOK>(pos, mlist, us, target);
-  mlist = generate_piece_moves<BISHOP>(pos, mlist, us, target);
-  mlist = generate_piece_moves<KNIGHT>(pos, mlist, us, target);
-  mlist = generate_piece_moves<PAWN, CAPTURE>(pos, mlist, us, target);
-  return  generate_piece_moves<KING>(pos, mlist, us, target);
-}
-
-
-/// generate_noncaptures() generates all pseudo-legal non-captures and
+///
+/// generate<MV_NON_CAPTURE> generates all pseudo-legal non-captures and
 /// underpromotions. Returns a pointer to the end of the move list.
+///
+/// generate<MV_NON_EVASION> generates all pseudo-legal captures and
+/// non-captures. Returns a pointer to the end of the move list.
 
-MoveStack* generate_noncaptures(const Position& pos, MoveStack* mlist) {
+template<MoveType Type>
+MoveStack* generate(const Position& pos, MoveStack* mlist) {
 
-  assert(pos.is_ok());
-  assert(!pos.is_check());
+  assert(Type == MV_CAPTURE || Type == MV_NON_CAPTURE || Type == MV_NON_EVASION);
+  assert(!pos.in_check());
 
   Color us = pos.side_to_move();
-  Bitboard target = pos.empty_squares();
+  Bitboard target;
 
-  mlist = generate_piece_moves<PAWN, NON_CAPTURE>(pos, mlist, us, target);
+  if (Type == MV_CAPTURE)
+      target = pos.pieces(flip(us));
+
+  else if (Type == MV_NON_CAPTURE)
+      target = pos.empty_squares();
+
+  else if (Type == MV_NON_EVASION)
+      target = pos.pieces(flip(us)) | pos.empty_squares();
+
+  mlist = generate_piece_moves<PAWN, Type>(pos, mlist, us, target);
   mlist = generate_piece_moves<KNIGHT>(pos, mlist, us, target);
   mlist = generate_piece_moves<BISHOP>(pos, mlist, us, target);
   mlist = generate_piece_moves<ROOK>(pos, mlist, us, target);
   mlist = generate_piece_moves<QUEEN>(pos, mlist, us, target);
   mlist = generate_piece_moves<KING>(pos, mlist, us, target);
-  mlist = generate_castle_moves<KING_SIDE>(pos, mlist);
-  return  generate_castle_moves<QUEEN_SIDE>(pos, mlist);
+
+  if (Type != MV_CAPTURE && pos.can_castle(us))
+  {
+      if (pos.can_castle(us == WHITE ? WHITE_OO : BLACK_OO))
+          mlist = generate_castle_moves<KING_SIDE>(pos, mlist, us);
+
+      if (pos.can_castle(us == WHITE ? WHITE_OOO : BLACK_OOO))
+          mlist = generate_castle_moves<QUEEN_SIDE>(pos, mlist, us);
+  }
+
+  return mlist;
 }
 
+// Explicit template instantiations
+template MoveStack* generate<MV_CAPTURE>(const Position& pos, MoveStack* mlist);
+template MoveStack* generate<MV_NON_CAPTURE>(const Position& pos, MoveStack* mlist);
+template MoveStack* generate<MV_NON_EVASION>(const Position& pos, MoveStack* mlist);
 
-/// generate_non_capture_checks() generates all pseudo-legal non-captures and knight
+
+/// generate<MV_NON_CAPTURE_CHECK> generates all pseudo-legal non-captures and knight
 /// underpromotions that give check. Returns a pointer to the end of the move list.
+template<>
+MoveStack* generate<MV_NON_CAPTURE_CHECK>(const Position& pos, MoveStack* mlist) {
 
-MoveStack* generate_non_capture_checks(const Position& pos, MoveStack* mlist) {
-
-  assert(pos.is_ok());
-  assert(!pos.is_check());
+  assert(!pos.in_check());
 
   Bitboard b, dc;
   Square from;
   Color us = pos.side_to_move();
-  Square ksq = pos.king_square(opposite_color(us));
+  Square ksq = pos.king_square(flip(us));
 
-  assert(pos.piece_on(ksq) == piece_of_color_and_type(opposite_color(us), KING));
+  assert(pos.piece_on(ksq) == make_piece(flip(us), KING));
 
   // Discovered non-capture checks
-  b = dc = pos.discovered_check_candidates(us);
+  b = dc = pos.discovered_check_candidates();
 
   while (b)
   {
      from = pop_1st_bit(&b);
-     switch (pos.type_of_piece_on(from))
+     switch (type_of(pos.piece_on(from)))
      {
       case PAWN:   /* Will be generated togheter with pawns direct checks */     break;
       case KNIGHT: mlist = generate_discovered_checks<KNIGHT>(pos, mlist, from); break;
@@ -181,13 +229,12 @@ MoveStack* generate_non_capture_checks(const Position& pos, MoveStack* mlist) {
 }
 
 
-/// generate_evasions() generates all pseudo-legal check evasions when
-/// the side to move is in check. Returns a pointer to the end of the move list.
+/// generate<MV_EVASION> generates all pseudo-legal check evasions when the side
+/// to move is in check. Returns a pointer to the end of the move list.
+template<>
+MoveStack* generate<MV_EVASION>(const Position& pos, MoveStack* mlist) {
 
-MoveStack* generate_evasions(const Position& pos, MoveStack* mlist) {
-
-  assert(pos.is_ok());
-  assert(pos.is_check());
+  assert(pos.in_check());
 
   Bitboard b, target;
   Square from, checksq;
@@ -195,9 +242,9 @@ MoveStack* generate_evasions(const Position& pos, MoveStack* mlist) {
   Color us = pos.side_to_move();
   Square ksq = pos.king_square(us);
   Bitboard checkers = pos.checkers();
-  Bitboard sliderAttacks = EmptyBoardBB;
+  Bitboard sliderAttacks = 0;
 
-  assert(pos.piece_on(ksq) == piece_of_color_and_type(us, KING));
+  assert(pos.piece_on(ksq) == make_piece(us, KING));
   assert(checkers);
 
   // Find squares attacked by slider checkers, we will remove
@@ -209,26 +256,31 @@ MoveStack* generate_evasions(const Position& pos, MoveStack* mlist) {
       checkersCnt++;
       checksq = pop_1st_bit(&b);
 
-      assert(pos.color_of_piece_on(checksq) == opposite_color(us));
+      assert(color_of(pos.piece_on(checksq)) == flip(us));
 
-      switch (pos.type_of_piece_on(checksq))
+      switch (type_of(pos.piece_on(checksq)))
       {
       case BISHOP: sliderAttacks |= BishopPseudoAttacks[checksq]; break;
       case ROOK:   sliderAttacks |= RookPseudoAttacks[checksq];   break;
       case QUEEN:
-          // In case of a queen remove also squares attacked in the other direction to
-          // avoid possible illegal moves when queen and king are on adjacent squares.
-          if (direction_is_straight(checksq, ksq))
-              sliderAttacks |= RookPseudoAttacks[checksq] | pos.attacks_from<BISHOP>(checksq);
+          // If queen and king are far we can safely remove all the squares attacked
+          // in the other direction becuase are not reachable by the king anyway.
+          if (squares_between(ksq, checksq) || (RookPseudoAttacks[checksq] & (1ULL << ksq)))
+              sliderAttacks |= QueenPseudoAttacks[checksq];
+
+          // Otherwise, if king and queen are adjacent and on a diagonal line, we need to
+          // use real rook attacks to check if king is safe to move in the other direction.
+          // For example: king in B2, queen in A1 a knight in B1, and we can safely move to C1.
           else
               sliderAttacks |= BishopPseudoAttacks[checksq] | pos.attacks_from<ROOK>(checksq);
+
       default:
           break;
       }
   } while (b);
 
   // Generate evasions for king, capture and non capture moves
-  b = pos.attacks_from<KING>(ksq) & ~pos.pieces_of_color(us) & ~sliderAttacks;
+  b = pos.attacks_from<KING>(ksq) & ~pos.pieces(us) & ~sliderAttacks;
   from = ksq;
   SERIALIZE_MOVES(b);
 
@@ -240,7 +292,7 @@ MoveStack* generate_evasions(const Position& pos, MoveStack* mlist) {
   // checker piece is possible.
   target = squares_between(checksq, ksq) | checkers;
 
-  mlist = generate_piece_moves<PAWN, EVASION>(pos, mlist, us, target);
+  mlist = generate_piece_moves<PAWN, MV_EVASION>(pos, mlist, us, target);
   mlist = generate_piece_moves<KNIGHT>(pos, mlist, us, target);
   mlist = generate_piece_moves<BISHOP>(pos, mlist, us, target);
   mlist = generate_piece_moves<ROOK>(pos, mlist, us, target);
@@ -248,450 +300,238 @@ MoveStack* generate_evasions(const Position& pos, MoveStack* mlist) {
 }
 
 
-/// generate_moves() computes a complete list of legal or pseudo-legal moves in
-/// the current position. This function is not very fast, and should be used
-/// only in non time-critical paths.
+/// generate<MV_LEGAL> computes a complete list of legal moves in the current position
 
-MoveStack* generate_moves(const Position& pos, MoveStack* mlist, bool pseudoLegal) {
-
-  assert(pos.is_ok());
+template<>
+MoveStack* generate<MV_LEGAL>(const Position& pos, MoveStack* mlist) {
 
   MoveStack *last, *cur = mlist;
-  Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
+  Bitboard pinned = pos.pinned_pieces();
 
-  // Generate pseudo-legal moves
-  if (pos.is_check())
-      last = generate_evasions(pos, mlist);
-  else
-      last = generate_noncaptures(pos, generate_captures(pos, mlist));
-
-  if (pseudoLegal)
-      return last;
+  last = pos.in_check() ? generate<MV_EVASION>(pos, mlist)
+                        : generate<MV_NON_EVASION>(pos, mlist);
 
   // Remove illegal moves from the list
   while (cur != last)
-      if (pos.pl_move_is_legal(cur->move, pinned))
-          cur++;
-      else
+      if (!pos.pl_move_is_legal(cur->move, pinned))
           cur->move = (--last)->move;
+      else
+          cur++;
 
   return last;
 }
 
 
-/// move_is_legal() takes a position and a (not necessarily pseudo-legal)
-/// move and tests whether the move is legal. This version is not very fast
-/// and should be used only in non time-critical paths.
-
-bool move_is_legal(const Position& pos, const Move m) {
-
-  MoveStack mlist[256];
-  MoveStack *cur, *last = generate_moves(pos, mlist, true);
-
-   for (cur = mlist; cur != last; cur++)
-      if (cur->move == m)
-          return pos.pl_move_is_legal(m, pos.pinned_pieces(pos.side_to_move()));
-
-  return false;
-}
-
-
-/// Fast version of move_is_legal() that takes a position a move and a
-/// bitboard of pinned pieces as input, and tests whether the move is legal.
-
-bool move_is_legal(const Position& pos, const Move m, Bitboard pinned) {
-
-  assert(pos.is_ok());
-  assert(move_is_ok(m));
-  assert(pinned == pos.pinned_pieces(pos.side_to_move()));
-
-  Color us = pos.side_to_move();
-  Color them = opposite_color(us);
-  Square from = move_from(m);
-  Square to = move_to(m);
-  Piece pc = pos.piece_on(from);
-
-  // Use a slower but simpler function for uncommon cases
-  if (move_is_ep(m) || move_is_castle(m))
-      return move_is_legal(pos, m);
-
-  // If the from square is not occupied by a piece belonging to the side to
-  // move, the move is obviously not legal.
-  if (color_of_piece(pc) != us)
-      return false;
-
-  // The destination square cannot be occupied by a friendly piece
-  if (pos.color_of_piece_on(to) == us)
-      return false;
-
-  // Handle the special case of a pawn move
-  if (type_of_piece(pc) == PAWN)
-  {
-      // Move direction must be compatible with pawn color
-      int direction = to - from;
-      if ((us == WHITE) != (direction > 0))
-          return false;
-
-      // A pawn move is a promotion iff the destination square is
-      // on the 8/1th rank.
-      if ((  (square_rank(to) == RANK_8 && us == WHITE)
-           ||(square_rank(to) == RANK_1 && us != WHITE)) != bool(move_is_promotion(m)))
-          return false;
-
-      // The promotion piece, if any, must be valid
-      if (move_promotion_piece(m) > QUEEN || move_promotion_piece(m) == PAWN)
-          return false;
-
-      // Proceed according to the square delta between the origin and
-      // destination squares.
-      switch (direction)
-      {
-      case DELTA_NW:
-      case DELTA_NE:
-      case DELTA_SW:
-      case DELTA_SE:
-      // Capture. The destination square must be occupied by an enemy
-      // piece (en passant captures was handled earlier).
-          if (pos.color_of_piece_on(to) != them)
-              return false;
-          break;
-
-      case DELTA_N:
-      case DELTA_S:
-      // Pawn push. The destination square must be empty.
-          if (!pos.square_is_empty(to))
-              return false;
-          break;
-
-      case DELTA_NN:
-      // Double white pawn push. The destination square must be on the fourth
-      // rank, and both the destination square and the square between the
-      // source and destination squares must be empty.
-      if (   square_rank(to) != RANK_4
-          || !pos.square_is_empty(to)
-          || !pos.square_is_empty(from + DELTA_N))
-          return false;
-          break;
-
-      case DELTA_SS:
-      // Double black pawn push. The destination square must be on the fifth
-      // rank, and both the destination square and the square between the
-      // source and destination squares must be empty.
-          if (   square_rank(to) != RANK_5
-              || !pos.square_is_empty(to)
-              || !pos.square_is_empty(from + DELTA_S))
-              return false;
-          break;
-
-      default:
-          return false;
-      }
-      // The move is pseudo-legal, check if it is also legal
-      return pos.is_check() ? pos.pl_move_is_evasion(m, pinned) : pos.pl_move_is_legal(m, pinned);
-  }
-
-  // Luckly we can handle all the other pieces in one go
-  return    bit_is_set(pos.attacks_from(pc, from), to)
-        && (pos.is_check() ? pos.pl_move_is_evasion(m, pinned) : pos.pl_move_is_legal(m, pinned))
-        && !move_is_promotion(m);
-}
-
-
 namespace {
 
-  template<PieceType Piece>
-  MoveStack* generate_piece_moves(const Position& pos, MoveStack* mlist, Color us, Bitboard target) {
-
-    Bitboard b;
-    Square from;
-    const Square* ptr = pos.piece_list_begin(us, Piece);
-
-    while ((from = *ptr++) != SQ_NONE)
-    {
-        b = pos.attacks_from<Piece>(from) & target;
-        SERIALIZE_MOVES(b);
-    }
-    return mlist;
-  }
-
-  template<>
-  MoveStack* generate_piece_moves<KING>(const Position& pos, MoveStack* mlist, Color us, Bitboard target) {
-
-    Bitboard b;
-    Square from = pos.king_square(us);
-
-    b = pos.attacks_from<KING>(from) & target;
-    SERIALIZE_MOVES(b);
-    return mlist;
-  }
-
-  template<Color Us, SquareDelta Direction>
+  template<Square Delta>
   inline Bitboard move_pawns(Bitboard p) {
 
-    if (Direction == DELTA_N)
-        return Us == WHITE ? p << 8 : p >> 8;
-    else if (Direction == DELTA_NE)
-        return Us == WHITE ? p << 9 : p >> 7;
-    else if (Direction == DELTA_NW)
-        return Us == WHITE ? p << 7 : p >> 9;
-    else
-        return p;
+    return Delta == DELTA_N  ? p << 8 : Delta == DELTA_S  ? p >> 8 :
+           Delta == DELTA_NE ? p << 9 : Delta == DELTA_SE ? p >> 7 :
+           Delta == DELTA_NW ? p << 7 : Delta == DELTA_SW ? p >> 9 : p;
   }
 
-  template<Color Us, MoveType Type, SquareDelta Diagonal>
-  inline MoveStack* generate_pawn_captures(MoveStack* mlist, Bitboard pawns, Bitboard enemyPieces) {
+  template<Square Delta>
+  inline MoveStack* generate_pawn_captures(MoveStack* mlist, Bitboard pawns, Bitboard target) {
 
-    // Calculate our parametrized parameters at compile time
-    const Bitboard TRank8BB = (Us == WHITE ? Rank8BB : Rank1BB);
-    const Bitboard TFileABB = (Diagonal == DELTA_NE ? FileABB : FileHBB);
-    const SquareDelta TDELTA_NE = (Us == WHITE ? DELTA_NE : DELTA_SE);
-    const SquareDelta TDELTA_NW = (Us == WHITE ? DELTA_NW : DELTA_SW);
-    const SquareDelta TTDELTA_NE = (Diagonal == DELTA_NE ? TDELTA_NE : TDELTA_NW);
+    const Bitboard TFileABB = (Delta == DELTA_NE || Delta == DELTA_SE ? FileABB : FileHBB);
 
-    Bitboard b1, b2;
+    Bitboard b;
     Square to;
 
     // Captures in the a1-h8 (a8-h1 for black) diagonal or in the h1-a8 (h8-a1 for black)
-    b1 = move_pawns<Us, Diagonal>(pawns) & ~TFileABB & enemyPieces;
+    b = move_pawns<Delta>(pawns) & target & ~TFileABB;
+    SERIALIZE_MOVES_D(b, -Delta);
+    return mlist;
+  }
 
-    // Capturing promotions and under-promotions
-    if (b1 & TRank8BB)
+  template<MoveType Type, Square Delta>
+  inline MoveStack* generate_promotions(const Position& pos, MoveStack* mlist, Bitboard pawnsOn7, Bitboard target) {
+
+    const Bitboard TFileABB = (Delta == DELTA_NE || Delta == DELTA_SE ? FileABB : FileHBB);
+
+    Bitboard b;
+    Square to;
+
+    // Promotions and under-promotions, both captures and non-captures
+    b = move_pawns<Delta>(pawnsOn7) & target;
+
+    if (Delta != DELTA_N && Delta != DELTA_S)
+        b &= ~TFileABB;
+
+    while (b)
     {
-        b2 = b1 & TRank8BB;
-        b1 &= ~TRank8BB;
-        while (b2)
+        to = pop_1st_bit(&b);
+
+        if (Type == MV_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION)
+            (*mlist++).move = make_promotion(to - Delta, to, QUEEN);
+
+        if (Type == MV_NON_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION)
         {
-            to = pop_1st_bit(&b2);
-
-            if (Type == CAPTURE || Type == EVASION)
-                (*mlist++).move = make_promotion_move(to - TTDELTA_NE, to, QUEEN);
-
-            if (Type == NON_CAPTURE || Type == EVASION)
-            {
-                (*mlist++).move = make_promotion_move(to - TTDELTA_NE, to, ROOK);
-                (*mlist++).move = make_promotion_move(to - TTDELTA_NE, to, BISHOP);
-                (*mlist++).move = make_promotion_move(to - TTDELTA_NE, to, KNIGHT);
-            }
-
-            // This is the only possible under promotion that can give a check
-            // not already included in the queen-promotion. It is not sure that
-            // the promoted knight will give check, but it doesn't worth to verify.
-            if (Type == CHECK)
-                (*mlist++).move = make_promotion_move(to - TTDELTA_NE, to, KNIGHT);
+            (*mlist++).move = make_promotion(to - Delta, to, ROOK);
+            (*mlist++).move = make_promotion(to - Delta, to, BISHOP);
+            (*mlist++).move = make_promotion(to - Delta, to, KNIGHT);
         }
+
+        // This is the only possible under promotion that can give a check
+        // not already included in the queen-promotion.
+        if (   Type == MV_CHECK
+            && bit_is_set(pos.attacks_from<KNIGHT>(to), pos.king_square(Delta > 0 ? BLACK : WHITE)))
+            (*mlist++).move = make_promotion(to - Delta, to, KNIGHT);
+        else (void)pos; // Silence a warning under MSVC
     }
-
-    // Serialize standard captures
-    if (Type == CAPTURE || Type == EVASION)
-        SERIALIZE_MOVES_D(b1, -TTDELTA_NE);
-
     return mlist;
   }
 
   template<Color Us, MoveType Type>
   MoveStack* generate_pawn_moves(const Position& pos, MoveStack* mlist, Bitboard target, Square ksq) {
 
-    // Calculate our parametrized parameters at compile time
-    const Color Them = (Us == WHITE ? BLACK : WHITE);
-    const Bitboard TRank8BB = (Us == WHITE ? Rank8BB : Rank1BB);
-    const Bitboard TRank7BB = (Us == WHITE ? Rank7BB : Rank2BB);
-    const Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB);
-    const SquareDelta TDELTA_N = (Us == WHITE ? DELTA_N : DELTA_S);
+    // Calculate our parametrized parameters at compile time, named
+    // according to the point of view of white side.
+    const Color    Them      = (Us == WHITE ? BLACK    : WHITE);
+    const Bitboard TRank7BB  = (Us == WHITE ? Rank7BB  : Rank2BB);
+    const Bitboard TRank3BB  = (Us == WHITE ? Rank3BB  : Rank6BB);
+    const Square   UP        = (Us == WHITE ? DELTA_N  : DELTA_S);
+    const Square   RIGHT_UP  = (Us == WHITE ? DELTA_NE : DELTA_SW);
+    const Square   LEFT_UP   = (Us == WHITE ? DELTA_NW : DELTA_SE);
 
     Square to;
-    Bitboard b1, b2, enemyPieces, emptySquares;
+    Bitboard b1, b2, dc1, dc2, pawnPushes, emptySquares;
     Bitboard pawns = pos.pieces(PAWN, Us);
+    Bitboard pawnsOn7 = pawns & TRank7BB;
+    Bitboard enemyPieces = (Type == MV_CAPTURE ? target : pos.pieces(Them));
 
-    // Standard captures and capturing promotions and underpromotions
-    if (Type == CAPTURE || Type == EVASION || (pawns & TRank7BB))
+    // Pre-calculate pawn pushes before changing emptySquares definition
+    if (Type != MV_CAPTURE)
     {
-        enemyPieces = (Type == CAPTURE ? target : pos.pieces_of_color(opposite_color(Us)));
-
-        if (Type == EVASION)
-            enemyPieces &= target; // Capture only the checker piece
-
-        mlist = generate_pawn_captures<Us, Type, DELTA_NE>(mlist, pawns, enemyPieces);
-        mlist = generate_pawn_captures<Us, Type, DELTA_NW>(mlist, pawns, enemyPieces);
+        emptySquares = (Type == MV_NON_CAPTURE ? target : pos.empty_squares());
+        pawnPushes = move_pawns<UP>(pawns & ~TRank7BB) & emptySquares;
     }
 
-    // Non-capturing promotions and underpromotions
-    if (pawns & TRank7BB)
+    if (Type == MV_EVASION)
     {
-        b1 = move_pawns<Us, DELTA_N>(pawns) & TRank8BB & pos.empty_squares();
-
-        if (Type == EVASION)
-            b1 &= target; // Only blocking promotion pushes
-
-        while (b1)
-        {
-            to = pop_1st_bit(&b1);
-
-            if (Type == CAPTURE || Type == EVASION)
-                (*mlist++).move = make_promotion_move(to - TDELTA_N, to, QUEEN);
-
-            if (Type == NON_CAPTURE || Type == EVASION)
-            {
-                (*mlist++).move = make_promotion_move(to - TDELTA_N, to, ROOK);
-                (*mlist++).move = make_promotion_move(to - TDELTA_N, to, BISHOP);
-                (*mlist++).move = make_promotion_move(to - TDELTA_N, to, KNIGHT);
-            }
-
-            // This is the only possible under promotion that can give a check
-            // not already included in the queen-promotion.
-            if (Type == CHECK && bit_is_set(pos.attacks_from<KNIGHT>(to), pos.king_square(Them)))
-                (*mlist++).move = make_promotion_move(to - TDELTA_N, to, KNIGHT);
-        }
+        emptySquares &= target; // Only blocking squares
+        enemyPieces  &= target; // Capture only the checker piece
     }
 
-    // Standard pawn pushes and double pushes
-    if (Type != CAPTURE)
+    // Promotions and underpromotions
+    if (pawnsOn7)
     {
-        emptySquares = (Type == NON_CAPTURE ? target : pos.empty_squares());
+        if (Type == MV_CAPTURE)
+            emptySquares = pos.empty_squares();
 
-        // Single and double pawn pushes
-        b1 = move_pawns<Us, DELTA_N>(pawns) & emptySquares & ~TRank8BB;
-        b2 = move_pawns<Us, DELTA_N>(b1 & TRank3BB) & emptySquares;
+        pawns &= ~TRank7BB;
+        mlist = generate_promotions<Type, RIGHT_UP>(pos, mlist, pawnsOn7, enemyPieces);
+        mlist = generate_promotions<Type, LEFT_UP>(pos, mlist, pawnsOn7, enemyPieces);
+        mlist = generate_promotions<Type, UP>(pos, mlist, pawnsOn7, emptySquares);
+    }
 
-        // Filter out unwanted pushes according to the move type
-        if (Type == EVASION)
+    // Standard captures
+    if (Type == MV_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION)
+    {
+        mlist = generate_pawn_captures<RIGHT_UP>(mlist, pawns, enemyPieces);
+        mlist = generate_pawn_captures<LEFT_UP>(mlist, pawns, enemyPieces);
+    }
+
+    // Single and double pawn pushes
+    if (Type != MV_CAPTURE)
+    {
+        b1 = (Type != MV_EVASION ? pawnPushes : pawnPushes & emptySquares);
+        b2 = move_pawns<UP>(pawnPushes & TRank3BB) & emptySquares;
+
+        if (Type == MV_CHECK)
         {
-            b1 &= target;
-            b2 &= target;
-        }
-        else if (Type == CHECK)
-        {
-            // Pawn moves which give direct cheks
+            // Consider only pawn moves which give direct checks
             b1 &= pos.attacks_from<PAWN>(ksq, Them);
             b2 &= pos.attacks_from<PAWN>(ksq, Them);
 
-            // Pawn moves which gives discovered check. This is possible only if
-            // the pawn is not on the same file as the enemy king, because we
-            //  don't generate captures.
+            // Add pawn moves which gives discovered check. This is possible only
+            // if the pawn is not on the same file as the enemy king, because we
+            // don't generate captures.
             if (pawns & target) // For CHECK type target is dc bitboard
             {
-                Bitboard dc1 = move_pawns<Us, DELTA_N>(pawns & target & ~file_bb(ksq)) & emptySquares & ~TRank8BB;
-                Bitboard dc2 = move_pawns<Us, DELTA_N>(dc1 & TRank3BB) & emptySquares;
+                dc1 = move_pawns<UP>(pawns & target & ~file_bb(ksq)) & emptySquares;
+                dc2 = move_pawns<UP>(dc1 & TRank3BB) & emptySquares;
 
                 b1 |= dc1;
                 b2 |= dc2;
             }
         }
-        SERIALIZE_MOVES_D(b1, -TDELTA_N);
-        SERIALIZE_MOVES_D(b2, -TDELTA_N -TDELTA_N);
+        SERIALIZE_MOVES_D(b1, -UP);
+        SERIALIZE_MOVES_D(b2, -UP -UP);
     }
 
     // En passant captures
-    if ((Type == CAPTURE || Type == EVASION) && pos.ep_square() != SQ_NONE)
+    if (  (Type == MV_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION)
+        && pos.ep_square() != SQ_NONE)
     {
-        assert(Us != WHITE || square_rank(pos.ep_square()) == RANK_6);
-        assert(Us != BLACK || square_rank(pos.ep_square()) == RANK_3);
+        assert(Us != WHITE || rank_of(pos.ep_square()) == RANK_6);
+        assert(Us != BLACK || rank_of(pos.ep_square()) == RANK_3);
 
         // An en passant capture can be an evasion only if the checking piece
         // is the double pushed pawn and so is in the target. Otherwise this
         // is a discovery check and we are forced to do otherwise.
-        if (Type == EVASION && !bit_is_set(target, pos.ep_square() - TDELTA_N))
+        if (Type == MV_EVASION && !bit_is_set(target, pos.ep_square() - UP))
             return mlist;
 
         b1 = pawns & pos.attacks_from<PAWN>(pos.ep_square(), Them);
 
-        assert(b1 != EmptyBoardBB);
+        assert(b1);
 
         while (b1)
         {
             to = pop_1st_bit(&b1);
-            (*mlist++).move = make_ep_move(to, pos.ep_square());
+            (*mlist++).move = make_enpassant(to, pos.ep_square());
         }
     }
     return mlist;
   }
 
-  template<PieceType Piece>
-  MoveStack* generate_discovered_checks(const Position& pos, MoveStack* mlist, Square from) {
-
-    assert(Piece != QUEEN);
-
-    Bitboard b = pos.attacks_from<Piece>(from) & pos.empty_squares();
-    if (Piece == KING)
-    {
-        Square ksq = pos.king_square(opposite_color(pos.side_to_move()));
-        b &= ~QueenPseudoAttacks[ksq];
-    }
-    SERIALIZE_MOVES(b);
-    return mlist;
-  }
-
-  template<PieceType Piece>
-  MoveStack* generate_direct_checks(const Position& pos, MoveStack* mlist, Color us,
-                                   Bitboard dc, Square ksq) {
-    assert(Piece != KING);
-
-    Bitboard checkSqs, b;
-    Square from;
-    const Square* ptr = pos.piece_list_begin(us, Piece);
-
-    if ((from = *ptr++) == SQ_NONE)
-        return mlist;
-
-    checkSqs = pos.attacks_from<Piece>(ksq) & pos.empty_squares();
-
-    do
-    {
-        if (   (Piece == QUEEN  && !(QueenPseudoAttacks[from]  & checkSqs))
-            || (Piece == ROOK   && !(RookPseudoAttacks[from]   & checkSqs))
-            || (Piece == BISHOP && !(BishopPseudoAttacks[from] & checkSqs)))
-            continue;
-
-        if (dc && bit_is_set(dc, from))
-            continue;
-
-        b = pos.attacks_from<Piece>(from) & checkSqs;
-        SERIALIZE_MOVES(b);
-
-    } while ((from = *ptr++) != SQ_NONE);
-
-    return mlist;
-  }
-
   template<CastlingSide Side>
-  MoveStack* generate_castle_moves(const Position& pos, MoveStack* mlist) {
+  MoveStack* generate_castle_moves(const Position& pos, MoveStack* mlist, Color us) {
 
-    Color us = pos.side_to_move();
+    CastleRight f = CastleRight((Side == KING_SIDE ? WHITE_OO : WHITE_OOO) << us);
+    Color them = flip(us);
 
-    if (  (Side == KING_SIDE && pos.can_castle_kingside(us))
-        ||(Side == QUEEN_SIDE && pos.can_castle_queenside(us)))
+    // After castling, the rook and king's final positions are exactly the same
+    // in Chess960 as they would be in standard chess.
+    Square kfrom = pos.king_square(us);
+    Square rfrom = pos.castle_rook_square(f);
+    Square kto = relative_square(us, Side == KING_SIDE ? SQ_G1 : SQ_C1);
+    Square rto = relative_square(us, Side == KING_SIDE ? SQ_F1 : SQ_D1);
+
+    assert(!pos.in_check());
+    assert(pos.piece_on(kfrom) == make_piece(us, KING));
+    assert(pos.piece_on(rfrom) == make_piece(us, ROOK));
+
+    // Unimpeded rule: All the squares between the king's initial and final squares
+    // (including the final square), and all the squares between the rook's initial
+    // and final squares (including the final square), must be vacant except for
+    // the king and castling rook.
+    for (Square s = std::min(kfrom, kto); s <= std::max(kfrom, kto); s++)
+        if (  (s != kfrom && s != rfrom && !pos.square_is_empty(s))
+            ||(pos.attackers_to(s) & pos.pieces(them)))
+            return mlist;
+
+    for (Square s = std::min(rfrom, rto); s <= std::max(rfrom, rto); s++)
+        if (s != kfrom && s != rfrom && !pos.square_is_empty(s))
+            return mlist;
+
+    // Because we generate only legal castling moves we need to verify that
+    // when moving the castling rook we do not discover some hidden checker.
+    // For instance an enemy queen in SQ_A1 when castling rook is in SQ_B1.
+    if (pos.is_chess960())
     {
-        Color them = opposite_color(us);
-        Square ksq = pos.king_square(us);
-
-        assert(pos.piece_on(ksq) == piece_of_color_and_type(us, KING));
-
-        Square rsq = (Side == KING_SIDE ? pos.initial_kr_square(us) : pos.initial_qr_square(us));
-        Square s1 = relative_square(us, Side == KING_SIDE ? SQ_G1 : SQ_C1);
-        Square s2 = relative_square(us, Side == KING_SIDE ? SQ_F1 : SQ_D1);
-        Square s;
-        bool illegal = false;
-
-        assert(pos.piece_on(rsq) == piece_of_color_and_type(us, ROOK));
-
-        // It is a bit complicated to correctly handle Chess960
-        for (s = Min(ksq, s1); s <= Max(ksq, s1); s++)
-            if (  (s != ksq && s != rsq && pos.square_is_occupied(s))
-                ||(pos.attackers_to(s) & pos.pieces_of_color(them)))
-                illegal = true;
-
-        for (s = Min(rsq, s2); s <= Max(rsq, s2); s++)
-            if (s != ksq && s != rsq && pos.square_is_occupied(s))
-                illegal = true;
-
-        if (   Side == QUEEN_SIDE
-            && square_file(rsq) == FILE_B
-            && (   pos.piece_on(relative_square(us, SQ_A1)) == piece_of_color_and_type(them, ROOK)
-                || pos.piece_on(relative_square(us, SQ_A1)) == piece_of_color_and_type(them, QUEEN)))
-            illegal = true;
-
-        if (!illegal)
-            (*mlist++).move = make_castle_move(ksq, rsq);
+        Bitboard occ = pos.occupied_squares();
+        clear_bit(&occ, rfrom);
+        if (pos.attackers_to(kto, occ) & pos.pieces(them))
+            return mlist;
     }
+
+    (*mlist++).move = make_castle(kfrom, rfrom);
+
     return mlist;
   }
-}
+
+} // namespace

src/movegen.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,28 +17,40 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(MOVEGEN_H_INCLUDED)
 #define MOVEGEN_H_INCLUDED
 
-////
-//// Includes
-////
+#include "types.h"
 
-#include "position.h"
+enum MoveType {
+  MV_CAPTURE,
+  MV_NON_CAPTURE,
+  MV_CHECK,
+  MV_NON_CAPTURE_CHECK,
+  MV_EVASION,
+  MV_NON_EVASION,
+  MV_LEGAL
+};
 
+class Position;
 
-////
-//// Prototypes
-////
+template<MoveType>
+MoveStack* generate(const Position& pos, MoveStack* mlist);
 
-extern MoveStack* generate_captures(const Position& pos, MoveStack* mlist);
-extern MoveStack* generate_noncaptures(const Position& pos, MoveStack* mlist);
-extern MoveStack* generate_non_capture_checks(const Position& pos, MoveStack* mlist);
-extern MoveStack* generate_evasions(const Position& pos, MoveStack* mlist);
-extern MoveStack* generate_moves(const Position& pos, MoveStack* mlist, bool pseudoLegal = false);
-extern bool move_is_legal(const Position& pos, const Move m, Bitboard pinned);
-extern bool move_is_legal(const Position& pos, const Move m);
+/// The MoveList struct is a simple wrapper around generate(), sometimes comes
+/// handy to use this class instead of the low level generate() function.
+template<MoveType T>
+struct MoveList {
 
+  explicit MoveList(const Position& pos) : cur(mlist), last(generate<T>(pos, mlist)) {}
+  void operator++() { cur++; }
+  bool end() const { return cur == last; }
+  Move move() const { return cur->move; }
+  int size() const { return int(last - mlist); }
+
+private:
+  MoveStack mlist[MAX_MOVES];
+  MoveStack *cur, *last;
+};
 
 #endif // !defined(MOVEGEN_H_INCLUDED)

src/movepick.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -18,101 +18,138 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
+#include <algorithm>
 #include <cassert>
 
-#include "history.h"
 #include "movegen.h"
 #include "movepick.h"
 #include "search.h"
-#include "value.h"
-
-
-////
-//// Local definitions
-////
+#include "types.h"
 
 namespace {
 
   enum MovegenPhase {
-    PH_TT_MOVES,       // Transposition table move and mate killer
-    PH_GOOD_CAPTURES,  // Queen promotions and captures with SEE values >= 0
-    PH_KILLERS,        // Killer moves from the current ply
-    PH_NONCAPTURES,    // Non-captures and underpromotions
-    PH_BAD_CAPTURES,   // Queen promotions and captures with SEE values < 0
-    PH_EVASIONS,       // Check evasions
-    PH_QCAPTURES,      // Captures in quiescence search
-    PH_QCHECKS,        // Non-capture checks in quiescence search
+    PH_TT_MOVE,       // Transposition table move
+    PH_GOOD_CAPTURES, // Queen promotions and captures with SEE values >= captureThreshold (captureThreshold <= 0)
+    PH_GOOD_PROBCUT,  // Queen promotions and captures with SEE values > captureThreshold (captureThreshold >= 0)
+    PH_KILLERS,       // Killer moves from the current ply
+    PH_NONCAPTURES_1, // Non-captures and underpromotions with positive score
+    PH_NONCAPTURES_2, // Non-captures and underpromotions with non-positive score
+    PH_BAD_CAPTURES,  // Queen promotions and captures with SEE values < captureThreshold (captureThreshold <= 0)
+    PH_EVASIONS,      // Check evasions
+    PH_QCAPTURES,     // Captures in quiescence search
+    PH_QRECAPTURES,   // Recaptures in quiescence search
+    PH_QCHECKS,       // Non-capture checks in quiescence search
     PH_STOP
   };
 
   CACHE_LINE_ALIGNMENT
-  const uint8_t MainSearchPhaseTable[] = { PH_TT_MOVES, PH_GOOD_CAPTURES, PH_KILLERS, PH_NONCAPTURES, PH_BAD_CAPTURES, PH_STOP};
-  const uint8_t EvasionsPhaseTable[] = { PH_TT_MOVES, PH_EVASIONS, PH_STOP};
-  const uint8_t QsearchWithChecksPhaseTable[] = { PH_TT_MOVES, PH_QCAPTURES, PH_QCHECKS, PH_STOP};
-  const uint8_t QsearchWithoutChecksPhaseTable[] = { PH_TT_MOVES, PH_QCAPTURES, PH_STOP};
+  const uint8_t MainSearchTable[] = { PH_TT_MOVE, PH_GOOD_CAPTURES, PH_KILLERS, PH_NONCAPTURES_1, PH_NONCAPTURES_2, PH_BAD_CAPTURES, PH_STOP };
+  const uint8_t EvasionTable[] = { PH_TT_MOVE, PH_EVASIONS, PH_STOP };
+  const uint8_t QsearchWithChecksTable[] = { PH_TT_MOVE, PH_QCAPTURES, PH_QCHECKS, PH_STOP };
+  const uint8_t QsearchWithoutChecksTable[] = { PH_TT_MOVE, PH_QCAPTURES, PH_STOP };
+  const uint8_t QsearchRecapturesTable[] = { PH_TT_MOVE, PH_QRECAPTURES, PH_STOP };
+  const uint8_t ProbCutTable[] = { PH_TT_MOVE, PH_GOOD_PROBCUT, PH_STOP };
+
+  // Unary predicate used by std::partition to split positive scores from remaining
+  // ones so to sort separately the two sets, and with the second sort delayed.
+  inline bool has_positive_score(const MoveStack& move) { return move.score > 0; }
+
+  // Picks and pushes to the front the best move in range [firstMove, lastMove),
+  // it is faster than sorting all the moves in advance when moves are few, as
+  // normally are the possible captures.
+  inline MoveStack* pick_best(MoveStack* firstMove, MoveStack* lastMove)
+  {
+      std::swap(*firstMove, *std::max_element(firstMove, lastMove));
+      return firstMove;
+  }
 }
 
-
-////
-//// Functions
-////
-
-
-/// Constructor for the MovePicker class. Apart from the position for which
-/// it is asked to pick legal moves, MovePicker also wants some information
+/// Constructors for the MovePicker class. As arguments we pass information
 /// to help it to return the presumably good moves first, to decide which
 /// moves to return (in the quiescence search, for instance, we only want to
 /// search captures, promotions and some checks) and about how important good
 /// move ordering is at the current node.
 
 MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h,
-                       SearchStack* ss, Value beta) : pos(p), H(h) {
-  int searchTT = ttm;
-  ttMoves[0].move = ttm;
-  badCaptureThreshold = 0;
-  lastBadCapture = badCaptures;
+                       Search::Stack* ss, Value beta) : pos(p), H(h), depth(d) {
+  captureThreshold = 0;
+  badCaptures = moves + MAX_MOVES;
 
-  pinned = p.pinned_pieces(pos.side_to_move());
+  assert(d > DEPTH_ZERO);
 
-  if (ss && !p.is_check())
+  if (p.in_check())
   {
-      ttMoves[1].move = (ss->mateKiller == ttm) ? MOVE_NONE : ss->mateKiller;
-      searchTT |= ttMoves[1].move;
-      killers[0].move = ss->killers[0];
-      killers[1].move = ss->killers[1];
-  } else
-      ttMoves[1].move = killers[0].move = killers[1].move = MOVE_NONE;
-
-  if (p.is_check())
-      phasePtr = EvasionsPhaseTable;
-  else if (d > Depth(0))
-  {
-      // Consider sligtly negative captures as good if at low
-      // depth and far from beta.
-      if (ss && ss->eval < beta - PawnValueMidgame && d < 3 * OnePly)
-          badCaptureThreshold = -PawnValueMidgame;
-
-      phasePtr = MainSearchPhaseTable;
+      killers[0].move = killers[1].move = MOVE_NONE;
+      phasePtr = EvasionTable;
   }
-  else if (d == Depth(0))
-      phasePtr = QsearchWithChecksPhaseTable;
   else
   {
-      phasePtr = QsearchWithoutChecksPhaseTable;
+      killers[0].move = ss->killers[0];
+      killers[1].move = ss->killers[1];
+
+      // Consider sligtly negative captures as good if at low depth and far from beta
+      if (ss && ss->eval < beta - PawnValueMidgame && d < 3 * ONE_PLY)
+          captureThreshold = -PawnValueMidgame;
+
+      // Consider negative captures as good if still enough to reach beta
+      else if (ss && ss->eval > beta)
+          captureThreshold = beta - ss->eval;
+
+      phasePtr = MainSearchTable;
+  }
+
+  ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
+  phasePtr += int(ttMove == MOVE_NONE) - 1;
+  go_next_phase();
+}
+
+MovePicker::MovePicker(const Position& p, Move ttm, Depth d, const History& h, Square recaptureSq)
+                      : pos(p), H(h) {
+
+  assert(d <= DEPTH_ZERO);
+
+  if (p.in_check())
+      phasePtr = EvasionTable;
+  else if (d >= DEPTH_QS_CHECKS)
+      phasePtr = QsearchWithChecksTable;
+  else if (d >= DEPTH_QS_RECAPTURES)
+  {
+      phasePtr = QsearchWithoutChecksTable;
 
       // Skip TT move if is not a capture or a promotion, this avoids
       // qsearch tree explosion due to a possible perpetual check or
       // similar rare cases when TT table is full.
-      if (ttm != MOVE_NONE && !pos.move_is_capture_or_promotion(ttm))
-          searchTT = ttMoves[0].move = MOVE_NONE;
+      if (ttm != MOVE_NONE && !pos.is_capture_or_promotion(ttm))
+          ttm = MOVE_NONE;
+  }
+  else
+  {
+      phasePtr = QsearchRecapturesTable;
+      recaptureSquare = recaptureSq;
+      ttm = MOVE_NONE;
   }
 
-  phasePtr += int(!searchTT) - 1;
+  ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
+  phasePtr += int(ttMove == MOVE_NONE) - 1;
+  go_next_phase();
+}
+
+MovePicker::MovePicker(const Position& p, Move ttm, const History& h, PieceType parentCapture)
+                       : pos(p), H(h) {
+
+  assert (!pos.in_check());
+
+  // In ProbCut we consider only captures better than parent's move
+  captureThreshold = PieceValueMidgame[Piece(parentCapture)];
+  phasePtr = ProbCutTable;
+
+  if (   ttm != MOVE_NONE
+      && (!pos.is_capture(ttm) ||  pos.see(ttm) <= captureThreshold))
+      ttm = MOVE_NONE;
+
+  ttMove = (ttm && pos.is_pseudo_legal(ttm) ? ttm : MOVE_NONE);
+  phasePtr += int(ttMove == MOVE_NONE) - 1;
   go_next_phase();
 }
 
@@ -126,13 +163,13 @@ void MovePicker::go_next_phase() {
   phase = *(++phasePtr);
   switch (phase) {
 
-  case PH_TT_MOVES:
-      curMove = ttMoves;
-      lastMove = curMove + 2;
+  case PH_TT_MOVE:
+      lastMove = curMove + 1;
       return;
 
   case PH_GOOD_CAPTURES:
-      lastMove = generate_captures(pos, moves);
+  case PH_GOOD_PROBCUT:
+      lastMove = generate<MV_CAPTURE>(pos, moves);
       score_captures();
       return;
 
@@ -141,37 +178,48 @@ void MovePicker::go_next_phase() {
       lastMove = curMove + 2;
       return;
 
-  case PH_NONCAPTURES:
-      lastMove = generate_noncaptures(pos, moves);
+  case PH_NONCAPTURES_1:
+      lastNonCapture = lastMove = generate<MV_NON_CAPTURE>(pos, moves);
       score_noncaptures();
-      sort_moves(moves, lastMove, &lastGoodNonCapture);
+      lastMove = std::partition(curMove, lastMove, has_positive_score);
+      sort<MoveStack>(curMove, lastMove);
+      return;
+
+  case PH_NONCAPTURES_2:
+      curMove = lastMove;
+      lastMove = lastNonCapture;
+      if (depth >= 3 * ONE_PLY)
+          sort<MoveStack>(curMove, lastMove);
       return;
 
   case PH_BAD_CAPTURES:
-      // Bad captures SEE value is already calculated so just sort them
-      // to get SEE move ordering.
+      // Bad captures SEE value is already calculated so just pick
+      // them in order to get SEE move ordering.
       curMove = badCaptures;
-      lastMove = lastBadCapture;
+      lastMove = moves + MAX_MOVES;
       return;
 
   case PH_EVASIONS:
-      assert(pos.is_check());
-      lastMove = generate_evasions(pos, moves);
-      score_evasions_or_checks();
+      assert(pos.in_check());
+      lastMove = generate<MV_EVASION>(pos, moves);
+      score_evasions();
       return;
 
   case PH_QCAPTURES:
-      lastMove = generate_captures(pos, moves);
+      lastMove = generate<MV_CAPTURE>(pos, moves);
       score_captures();
       return;
 
+  case PH_QRECAPTURES:
+      lastMove = generate<MV_CAPTURE>(pos, moves);
+      return;
+
   case PH_QCHECKS:
-      lastMove = generate_non_capture_checks(pos, moves);
-      score_evasions_or_checks();
+      lastMove = generate<MV_NON_CAPTURE_CHECK>(pos, moves);
       return;
 
   case PH_STOP:
-      lastMove = curMove + 1; // Avoids another go_next_phase() call
+      lastMove = curMove + 1; // Avoid another go_next_phase() call
       return;
 
   default:
@@ -184,7 +232,7 @@ void MovePicker::go_next_phase() {
 /// MovePicker::score_captures(), MovePicker::score_noncaptures() and
 /// MovePicker::score_evasions() assign a numerical move ordering score
 /// to each move in a move list.  The moves with highest scores will be
-/// picked first by get_next_move().
+/// picked first by next_move().
 
 void MovePicker::score_captures() {
   // Winning and equal captures in the main search are ordered by MVV/LVA.
@@ -206,41 +254,28 @@ void MovePicker::score_captures() {
   for (MoveStack* cur = moves; cur != lastMove; cur++)
   {
       m = cur->move;
-      if (move_is_promotion(m))
-          cur->score = QueenValueMidgame;
-      else
-          cur->score =  pos.midgame_value_of_piece_on(move_to(m))
-                      - pos.type_of_piece_on(move_from(m));
+      cur->score =  PieceValueMidgame[pos.piece_on(to_sq(m))]
+                  - type_of(pos.piece_on(from_sq(m)));
+
+      if (is_promotion(m))
+          cur->score += PieceValueMidgame[Piece(promotion_piece_type(m))];
   }
 }
 
 void MovePicker::score_noncaptures() {
-  // First score by history, when no history is available then use
-  // piece/square tables values. This seems to be better then a
-  // random choice when we don't have an history for any move.
+
   Move m;
-  Piece piece;
-  Square from, to;
-  int hs;
+  Square from;
 
   for (MoveStack* cur = moves; cur != lastMove; cur++)
   {
       m = cur->move;
-      from = move_from(m);
-      to = move_to(m);
-      piece = pos.piece_on(from);
-      hs = H.move_ordering_score(piece, to);
-
-      // Ensure history has always highest priority
-      if (hs > 0)
-          hs += 10000;
-
-      // Gain table based scoring
-      cur->score = hs + 16 * H.gain(piece, to);
+      from = from_sq(m);
+      cur->score = H.value(pos.piece_on(from), to_sq(m));
   }
 }
 
-void MovePicker::score_evasions_or_checks() {
+void MovePicker::score_evasions() {
   // Try good captures ordered by MVV/LVA, then non-captures if
   // destination square is not under attack, ordered by history
   // value, and at the end bad-captures and non-captures with a
@@ -256,113 +291,109 @@ void MovePicker::score_evasions_or_checks() {
   {
       m = cur->move;
       if ((seeScore = pos.see_sign(m)) < 0)
-          cur->score = seeScore - HistoryMax; // Be sure are at the bottom
-      else if (pos.move_is_capture(m))
-          cur->score =  pos.midgame_value_of_piece_on(move_to(m))
-                      - pos.type_of_piece_on(move_from(m)) + HistoryMax;
+          cur->score = seeScore - History::MaxValue; // Be sure we are at the bottom
+      else if (pos.is_capture(m))
+          cur->score =  PieceValueMidgame[pos.piece_on(to_sq(m))]
+                      - type_of(pos.piece_on(from_sq(m))) + History::MaxValue;
       else
-          cur->score = H.move_ordering_score(pos.piece_on(move_from(m)), move_to(m));
+          cur->score = H.value(pos.piece_on(from_sq(m)), to_sq(m));
   }
 }
 
-/// MovePicker::get_next_move() is the most important method of the MovePicker
-/// class. It returns a new legal move every time it is called, until there
-/// are no more moves left.
-/// It picks the move with the biggest score from a list of generated moves taking
-/// care not to return the tt move if has already been searched previously.
-/// Note that this function is not thread safe so should be lock protected by
-/// caller when accessed through a shared MovePicker object.
+/// MovePicker::next_move() is the most important method of the MovePicker class.
+/// It returns a new pseudo legal move every time it is called, until there
+/// are no more moves left. It picks the move with the biggest score from a list
+/// of generated moves taking care not to return the tt move if has already been
+/// searched previously. Note that this function is not thread safe so should be
+/// lock protected by caller when accessed through a shared MovePicker object.
 
-Move MovePicker::get_next_move() {
+Move MovePicker::next_move() {
 
   Move move;
 
   while (true)
   {
-      while (curMove != lastMove)
-      {
-          switch (phase) {
+      while (curMove == lastMove)
+          go_next_phase();
 
-          case PH_TT_MOVES:
-              move = (curMove++)->move;
-              if (   move != MOVE_NONE
-                  && move_is_legal(pos, move, pinned))
+      switch (phase) {
+
+      case PH_TT_MOVE:
+          curMove++;
+          return ttMove;
+          break;
+
+      case PH_GOOD_CAPTURES:
+          move = pick_best(curMove++, lastMove)->move;
+          if (move != ttMove)
+          {
+              assert(captureThreshold <= 0); // Otherwise we must use see instead of see_sign
+
+              // Check for a non negative SEE now
+              int seeValue = pos.see_sign(move);
+              if (seeValue >= captureThreshold)
                   return move;
-              break;
 
-          case PH_GOOD_CAPTURES:
-              move = pick_best(curMove++, lastMove).move;
-              if (   move != ttMoves[0].move
-                  && move != ttMoves[1].move
-                  && pos.pl_move_is_legal(move, pinned))
-              {
-                  // Check for a non negative SEE now
-                  int seeValue = pos.see_sign(move);
-                  if (seeValue >= badCaptureThreshold)
-                      return move;
-
-                  // Losing capture, move it to the badCaptures[] array, note
-                  // that move has now been already checked for legality.
-                  assert(int(lastBadCapture - badCaptures) < 63);
-                  lastBadCapture->move = move;
-                  lastBadCapture->score = seeValue;
-                  lastBadCapture++;
-              }
-              break;
-
-          case PH_KILLERS:
-              move = (curMove++)->move;
-              if (   move != MOVE_NONE
-                  && move_is_legal(pos, move, pinned)
-                  && move != ttMoves[0].move
-                  && move != ttMoves[1].move
-                  && !pos.move_is_capture(move))
-                  return move;
-              break;
-
-          case PH_NONCAPTURES:
-
-              // Sort negative scored moves only when we get there
-              if (curMove == lastGoodNonCapture)
-                  insertion_sort(lastGoodNonCapture, lastMove);
-
-              move = (curMove++)->move;
-              if (   move != ttMoves[0].move
-                  && move != ttMoves[1].move
-                  && move != killers[0].move
-                  && move != killers[1].move
-                  && pos.pl_move_is_legal(move, pinned))
-                  return move;
-              break;
-
-          case PH_BAD_CAPTURES:
-              move = pick_best(curMove++, lastMove).move;
-              return move;
-
-          case PH_EVASIONS:
-          case PH_QCAPTURES:
-              move = pick_best(curMove++, lastMove).move;
-              if (   move != ttMoves[0].move
-                  && pos.pl_move_is_legal(move, pinned))
-                  return move;
-              break;
-
-          case PH_QCHECKS:
-              move = (curMove++)->move;
-              if (   move != ttMoves[0].move
-                  && pos.pl_move_is_legal(move, pinned))
-                  return move;
-              break;
-
-          case PH_STOP:
-              return MOVE_NONE;
-
-          default:
-              assert(false);
-              break;
+              // Losing capture, move it to the tail of the array
+              (--badCaptures)->move = move;
+              badCaptures->score = seeValue;
           }
+          break;
+
+     case PH_GOOD_PROBCUT:
+          move = pick_best(curMove++, lastMove)->move;
+          if (   move != ttMove
+              && pos.see(move) > captureThreshold)
+              return move;
+          break;
+
+      case PH_KILLERS:
+          move = (curMove++)->move;
+          if (   move != MOVE_NONE
+              && pos.is_pseudo_legal(move)
+              && move != ttMove
+              && !pos.is_capture(move))
+              return move;
+          break;
+
+      case PH_NONCAPTURES_1:
+      case PH_NONCAPTURES_2:
+          move = (curMove++)->move;
+          if (   move != ttMove
+              && move != killers[0].move
+              && move != killers[1].move)
+              return move;
+          break;
+
+      case PH_BAD_CAPTURES:
+          move = pick_best(curMove++, lastMove)->move;
+          return move;
+
+      case PH_EVASIONS:
+      case PH_QCAPTURES:
+          move = pick_best(curMove++, lastMove)->move;
+          if (move != ttMove)
+              return move;
+          break;
+
+      case PH_QRECAPTURES:
+          move = (curMove++)->move;
+          if (to_sq(move) == recaptureSquare)
+              return move;
+          break;
+
+      case PH_QCHECKS:
+          move = (curMove++)->move;
+          if (move != ttMove)
+              return move;
+          break;
+
+      case PH_STOP:
+          return MOVE_NONE;
+
+      default:
+          assert(false);
+          break;
       }
-      go_next_phase();
   }
 }
-

src/movepick.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,71 +17,48 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined MOVEPICK_H_INCLUDED
 #define MOVEPICK_H_INCLUDED
 
-////
-//// Includes
-////
-
-#include "depth.h"
 #include "history.h"
 #include "position.h"
+#include "search.h"
+#include "types.h"
 
-
-////
-//// Types
-////
-
-struct SearchStack;
-
-/// MovePicker is a class which is used to pick one legal move at a time from
-/// the current position. It is initialized with a Position object and a few
+/// MovePicker is a class which is used to pick one pseudo legal move at a time
+/// from the current position. It is initialized with a Position object and a few
 /// moves we have reason to believe are good. The most important method is
-/// MovePicker::pick_next_move(), which returns a new legal move each time it
-/// is called, until there are no legal moves left, when MOVE_NONE is returned.
+/// MovePicker::next_move(), which returns a new pseudo legal move each time
+/// it is called, until there are no moves left, when MOVE_NONE is returned.
 /// In order to improve the efficiency of the alpha beta algorithm, MovePicker
-/// attempts to return the moves which are most likely to be strongest first.
+/// attempts to return the moves which are most likely to get a cut-off first.
 
 class MovePicker {
 
-  MovePicker& operator=(const MovePicker&); // silence a warning under MSVC
+  MovePicker& operator=(const MovePicker&); // Silence a warning under MSVC
 
 public:
-  MovePicker(const Position& p, Move ttm, Depth d, const History& h, SearchStack* ss = NULL, Value beta = -VALUE_INFINITE);
-  Move get_next_move();
-  int number_of_evasions() const;
+  MovePicker(const Position&, Move, Depth, const History&, Search::Stack*, Value);
+  MovePicker(const Position&, Move, Depth, const History&, Square recaptureSq);
+  MovePicker(const Position&, Move, const History&, PieceType parentCapture);
+  Move next_move();
 
 private:
   void score_captures();
   void score_noncaptures();
-  void score_evasions_or_checks();
+  void score_evasions();
   void go_next_phase();
 
   const Position& pos;
   const History& H;
-  Bitboard pinned;
-  MoveStack ttMoves[2], killers[2];
-  int badCaptureThreshold, phase;
+  Depth depth;
+  Move ttMove;
+  MoveStack killers[2];
+  Square recaptureSquare;
+  int captureThreshold, phase;
   const uint8_t* phasePtr;
-  MoveStack *curMove, *lastMove, *lastGoodNonCapture, *lastBadCapture;
-  MoveStack moves[256], badCaptures[64];
+  MoveStack *curMove, *lastMove, *lastNonCapture, *badCaptures;
+  MoveStack moves[MAX_MOVES];
 };
 
-
-////
-//// Inline functions
-////
-
-/// MovePicker::number_of_evasions() simply returns the number of moves in
-/// evasions phase. It is intended to be used in positions where the side to
-/// move is in check, for detecting checkmates or situations where there is
-/// only a single reply to check.
-/// WARNING: It works as long as PH_EVASIONS is the _only_ phase for evasions.
-
-inline int MovePicker::number_of_evasions() const {
-  return int(lastMove - moves);
-}
-
 #endif // !defined(MOVEPICK_H_INCLUDED)

src/pawns.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,46 +17,37 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
 #include <cassert>
-#include <cstring>
 
+#include "bitboard.h"
 #include "bitcount.h"
 #include "pawns.h"
 #include "position.h"
 
-
-////
-//// Local definitions
-////
-
 namespace {
 
-  /// Constants and variables
-
   #define S(mg, eg) make_score(mg, eg)
 
-  // Doubled pawn penalty by file
-  const Score DoubledPawnPenalty[8] = {
-    S(13, 43), S(20, 48), S(23, 48), S(23, 48),
-    S(23, 48), S(23, 48), S(20, 48), S(13, 43)
-  };
+  // Doubled pawn penalty by opposed flag and file
+  const Score DoubledPawnPenalty[2][8] = {
+  { S(13, 43), S(20, 48), S(23, 48), S(23, 48),
+    S(23, 48), S(23, 48), S(20, 48), S(13, 43) },
+  { S(13, 43), S(20, 48), S(23, 48), S(23, 48),
+    S(23, 48), S(23, 48), S(20, 48), S(13, 43) }};
 
-  // Isolated pawn penalty by file
-  const Score IsolatedPawnPenalty[8] = {
-    S(25, 30), S(36, 35), S(40, 35), S(40, 35),
-    S(40, 35), S(40, 35), S(36, 35), S(25, 30)
-  };
+  // Isolated pawn penalty by opposed flag and file
+  const Score IsolatedPawnPenalty[2][8] = {
+  { S(37, 45), S(54, 52), S(60, 52), S(60, 52),
+    S(60, 52), S(60, 52), S(54, 52), S(37, 45) },
+  { S(25, 30), S(36, 35), S(40, 35), S(40, 35),
+    S(40, 35), S(40, 35), S(36, 35), S(25, 30) }};
 
-  // Backward pawn penalty by file
-  const Score BackwardPawnPenalty[8] = {
-    S(20, 28), S(29, 31), S(33, 31), S(33, 31),
-    S(33, 31), S(33, 31), S(29, 31), S(20, 28)
-  };
+  // Backward pawn penalty by opposed flag and file
+  const Score BackwardPawnPenalty[2][8] = {
+  { S(30, 42), S(43, 46), S(49, 46), S(49, 46),
+    S(49, 46), S(49, 46), S(43, 46), S(30, 42) },
+  { S(20, 28), S(29, 31), S(33, 31), S(33, 31),
+    S(33, 31), S(33, 31), S(29, 31), S(20, 28) }};
 
   // Pawn chain membership bonus by file
   const Score ChainBonus[8] = {
@@ -70,86 +61,26 @@ namespace {
     S(34,68), S(83,166), S(0, 0), S( 0, 0)
   };
 
-  // Pawn storm tables for positions with opposite castling
-  const int QStormTable[64] = {
-    0,  0,  0,  0, 0, 0, 0, 0,
-  -22,-22,-22,-14,-6, 0, 0, 0,
-   -6,-10,-10,-10,-6, 0, 0, 0,
-    4, 12, 16, 12, 4, 0, 0, 0,
-   16, 23, 23, 16, 0, 0, 0, 0,
-   23, 31, 31, 23, 0, 0, 0, 0,
-   23, 31, 31, 23, 0, 0, 0, 0,
-    0,  0,  0,  0, 0, 0, 0, 0
-  };
-
-  const int KStormTable[64] = {
-    0, 0, 0,  0,  0,  0,  0,  0,
-    0, 0, 0,-10,-19,-28,-33,-33,
-    0, 0, 0,-10,-15,-19,-24,-24,
-    0, 0, 0,  0,  1,  1,  1,  1,
-    0, 0, 0,  0,  1, 10, 19, 19,
-    0, 0, 0,  0,  1, 19, 31, 27,
-    0, 0, 0,  0,  0, 22, 31, 22,
-    0, 0, 0,  0,  0,  0,  0,  0
-  };
-
-  // Pawn storm open file bonuses by file
-  const int16_t QStormOpenFileBonus[8] = { 31, 31, 18, 0, 0, 0, 0, 0 };
-  const int16_t KStormOpenFileBonus[8] = { 0, 0, 0, 0, 0, 26, 42, 26 };
-
-  // Pawn storm lever bonuses by file
-  const int StormLeverBonus[8] = { -8, -8, -13, 0, 0, -13, -8, -8 };
+  const Score PawnStructureWeight = S(233, 201);
 
   #undef S
-}
 
-
-////
-//// Functions
-////
-
-/// PawnInfoTable c'tor and d'tor instantiated one each thread
-
-PawnInfoTable::PawnInfoTable(unsigned numOfEntries) : size(numOfEntries) {
-
-  entries = new PawnInfo[size];
-  if (!entries)
-  {
-      std::cerr << "Failed to allocate " << (numOfEntries * sizeof(PawnInfo))
-                << " bytes for pawn hash table." << std::endl;
-      Application::exit_with_failure();
+  inline Score apply_weight(Score v, Score w) {
+    return make_score((int(mg_value(v)) * mg_value(w)) / 0x100,
+                      (int(eg_value(v)) * eg_value(w)) / 0x100);
   }
 }
 
 
-PawnInfoTable::~PawnInfoTable() {
-
-  delete [] entries;
-}
-
-
-/// PawnInfo::clear() resets to zero the PawnInfo entry. Note that
-/// kingSquares[] is initialized to SQ_NONE instead.
-
-void PawnInfo::clear() {
-
-  memset(this, 0, sizeof(PawnInfo));
-  kingSquares[WHITE] = kingSquares[BLACK] = SQ_NONE;
-}
-
-
-/// PawnInfoTable::get_pawn_info() takes a position object as input, computes
+/// PawnInfoTable::pawn_info() takes a position object as input, computes
 /// a PawnInfo object, and returns a pointer to it. The result is also stored
-/// in a hash table, so we don't have to recompute everything when the same
+/// in an hash table, so we don't have to recompute everything when the same
 /// pawn structure occurs again.
 
-PawnInfo* PawnInfoTable::get_pawn_info(const Position& pos) const {
+PawnInfo* PawnInfoTable::pawn_info(const Position& pos) const {
 
-  assert(pos.is_ok());
-
-  Key key = pos.get_pawn_key();
-  int index = int(key & (size - 1));
-  PawnInfo* pi = entries + index;
+  Key key = pos.pawn_key();
+  PawnInfo* pi = probe(key);
 
   // If pi->key matches the position's pawn hash key, it means that we
   // have analysed this pawn structure before, and we can simply return
@@ -157,19 +88,24 @@ PawnInfo* PawnInfoTable::get_pawn_info(const Position& pos) const {
   if (pi->key == key)
       return pi;
 
-  // Clear the PawnInfo object, and set the key
-  pi->clear();
+  // Initialize PawnInfo entry
   pi->key = key;
+  pi->passedPawns[WHITE] = pi->passedPawns[BLACK] = 0;
+  pi->kingSquares[WHITE] = pi->kingSquares[BLACK] = SQ_NONE;
+  pi->halfOpenFiles[WHITE] = pi->halfOpenFiles[BLACK] = 0xFF;
 
   // Calculate pawn attacks
-  Bitboard whitePawns = pos.pieces(PAWN, WHITE);
-  Bitboard blackPawns = pos.pieces(PAWN, BLACK);
-  pi->pawnAttacks[WHITE] = ((whitePawns << 9) & ~FileABB) | ((whitePawns << 7) & ~FileHBB);
-  pi->pawnAttacks[BLACK] = ((blackPawns >> 7) & ~FileABB) | ((blackPawns >> 9) & ~FileHBB);
+  Bitboard wPawns = pos.pieces(PAWN, WHITE);
+  Bitboard bPawns = pos.pieces(PAWN, BLACK);
+  pi->pawnAttacks[WHITE] = ((wPawns << 9) & ~FileABB) | ((wPawns << 7) & ~FileHBB);
+  pi->pawnAttacks[BLACK] = ((bPawns >> 7) & ~FileABB) | ((bPawns >> 9) & ~FileHBB);
+
+  // Evaluate pawns for both colors and weight the result
+  pi->value =  evaluate_pawns<WHITE>(pos, wPawns, bPawns, pi)
+             - evaluate_pawns<BLACK>(pos, bPawns, wPawns, pi);
+
+  pi->value = apply_weight(pi->value, PawnStructureWeight);
 
-  // Evaluate pawns for both colors
-  pi->value =  evaluate_pawns<WHITE>(pos, whitePawns, blackPawns, pi)
-             - evaluate_pawns<BLACK>(pos, blackPawns, whitePawns, pi);
   return pi;
 }
 
@@ -178,63 +114,49 @@ PawnInfo* PawnInfoTable::get_pawn_info(const Position& pos) const {
 
 template<Color Us>
 Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
-                                    Bitboard theirPawns, PawnInfo* pi) const {
+                                    Bitboard theirPawns, PawnInfo* pi) {
+
+  const Color Them = (Us == WHITE ? BLACK : WHITE);
+
   Bitboard b;
   Square s;
   File f;
   Rank r;
-  int bonus;
   bool passed, isolated, doubled, opposed, chain, backward, candidate;
-  Score value = make_score(0, 0);
-  const Square* ptr = pos.piece_list_begin(Us, PAWN);
-
-  // Initialize pawn storm scores by giving bonuses for open files
-  for (f = FILE_A; f <= FILE_H; f++)
-      if (!(ourPawns & file_bb(f)))
-      {
-          pi->ksStormValue[Us] += KStormOpenFileBonus[f];
-          pi->qsStormValue[Us] += QStormOpenFileBonus[f];
-          pi->halfOpenFiles[Us] |= (1 << f);
-      }
+  Score value = SCORE_ZERO;
+  const Square* pl = pos.piece_list(Us, PAWN);
 
   // Loop through all pawns of the current color and score each pawn
-  while ((s = *ptr++) != SQ_NONE)
+  while ((s = *pl++) != SQ_NONE)
   {
-      f = square_file(s);
-      r = square_rank(s);
+      assert(pos.piece_on(s) == make_piece(Us, PAWN));
 
-      assert(pos.piece_on(s) == piece_of_color_and_type(Us, PAWN));
+      f = file_of(s);
+      r = rank_of(s);
 
-      // Calculate kingside and queenside pawn storm scores for both colors to be
-      // used when evaluating middle game positions with opposite side castling.
-      bonus = (f >= FILE_F ? evaluate_pawn_storm<Us, KingSide>(s, r, f, theirPawns) : 0);
-      pi->ksStormValue[Us] += KStormTable[relative_square(Us, s)] + bonus;
+      // This file cannot be half open
+      pi->halfOpenFiles[Us] &= ~(1 << f);
 
-      bonus = (f <= FILE_C ? evaluate_pawn_storm<Us, QueenSide>(s, r, f, theirPawns) : 0);
-      pi->qsStormValue[Us] += QStormTable[relative_square(Us, s)] + bonus;
+      // Our rank plus previous one. Used for chain detection
+      b = rank_bb(r) | rank_bb(Us == WHITE ? r - Rank(1) : r + Rank(1));
 
-      // Our rank plus previous one. Used for chain detection.
-      b = rank_bb(r) | rank_bb(r + (Us == WHITE ? -1 : 1));
-
-      // Passed, isolated, doubled or member of a pawn
-      // chain (but not the backward one) ?
+      // Flag the pawn as passed, isolated, doubled or member of a pawn
+      // chain (but not the backward one).
       passed   = !(theirPawns & passed_pawn_mask(Us, s));
-      doubled  =   ourPawns   & squares_behind(Us, s);
+      doubled  =   ourPawns   & squares_in_front_of(Us, s);
       opposed  =   theirPawns & squares_in_front_of(Us, s);
       isolated = !(ourPawns   & neighboring_files_bb(f));
       chain    =   ourPawns   & neighboring_files_bb(f) & b;
 
       // Test for backward pawn
-      //
-      // If the pawn is passed, isolated, or member of a pawn chain
-      // it cannot be backward. If can capture an enemy pawn or if
-      // there are friendly pawns behind on neighboring files it cannot
-      // be backward either.
-      if (   (passed | isolated | chain)
-          || (ourPawns & attack_span_mask(opposite_color(Us), s))
-          || (pos.attacks_from<PAWN>(s, Us) & theirPawns))
-          backward = false;
-      else
+      backward = false;
+
+      // If the pawn is passed, isolated, or member of a pawn chain it cannot
+      // be backward. If there are friendly pawns behind on neighboring files
+      // or if can capture an enemy pawn it cannot be backward either.
+      if (   !(passed | isolated | chain)
+          && !(ourPawns & attack_span_mask(Them, s))
+          && !(pos.attacks_from<PAWN>(s, Us) & theirPawns))
       {
           // We now know that there are no friendly pawns beside or behind this
           // pawn on neighboring files. We now check whether the pawn is
@@ -247,103 +169,72 @@ Score PawnInfoTable::evaluate_pawns(const Position& pos, Bitboard ourPawns,
           while (!(b & (ourPawns | theirPawns)))
               Us == WHITE ? b <<= 8 : b >>= 8;
 
-          // The friendly pawn needs to be at least two ranks closer than the enemy
-          // pawn in order to help the potentially backward pawn advance.
+          // The friendly pawn needs to be at least two ranks closer than the
+          // enemy pawn in order to help the potentially backward pawn advance.
           backward = (b | (Us == WHITE ? b << 8 : b >> 8)) & theirPawns;
       }
 
-      assert(passed | opposed | (attack_span_mask(Us, s) & theirPawns));
+      assert(opposed | passed | (attack_span_mask(Us, s) & theirPawns));
 
-      // Test for candidate passed pawn
-      candidate =   !(opposed | passed)
-                 && (b = attack_span_mask(opposite_color(Us), s + pawn_push(Us)) & ourPawns) != EmptyBoardBB
-                 &&  count_1s_max_15(b) >= count_1s_max_15(attack_span_mask(Us, s) & theirPawns);
+      // A not passed pawn is a candidate to become passed if it is free to
+      // advance and if the number of friendly pawns beside or behind this
+      // pawn on neighboring files is higher or equal than the number of
+      // enemy pawns in the forward direction on the neighboring files.
+      candidate =   !(opposed | passed | backward | isolated)
+                 && (b = attack_span_mask(Them, s + pawn_push(Us)) & ourPawns) != 0
+                 &&  popcount<Max15>(b) >= popcount<Max15>(attack_span_mask(Us, s) & theirPawns);
 
-      // In order to prevent doubled passed pawns from receiving a too big
-      // bonus, only the frontmost passed pawn on each file is considered as
-      // a true passed pawn.
-      if (passed && (ourPawns & squares_in_front_of(Us, s)))
-          passed = false;
-
-      // Mark the pawn as passed. Pawn will be properly scored in evaluation
-      // because we need full attack info to evaluate passed pawns.
-      if (passed)
-          set_bit(&(pi->passedPawns), s);
+      // Passed pawns will be properly scored in evaluation because we need
+      // full attack info to evaluate passed pawns. Only the frontmost passed
+      // pawn on each file is considered a true passed pawn.
+      if (passed && !doubled)
+          set_bit(&(pi->passedPawns[Us]), s);
 
       // Score this pawn
       if (isolated)
-      {
-          value -= IsolatedPawnPenalty[f];
-          if (!(theirPawns & file_bb(f)))
-              value -= IsolatedPawnPenalty[f] / 2;
-      }
+          value -= IsolatedPawnPenalty[opposed][f];
+
       if (doubled)
-          value -= DoubledPawnPenalty[f];
+          value -= DoubledPawnPenalty[opposed][f];
 
       if (backward)
-      {
-          value -= BackwardPawnPenalty[f];
-          if (!(theirPawns & file_bb(f)))
-              value -= BackwardPawnPenalty[f] / 2;
-      }
+          value -= BackwardPawnPenalty[opposed][f];
+
       if (chain)
           value += ChainBonus[f];
 
       if (candidate)
           value += CandidateBonus[relative_rank(Us, s)];
   }
-
   return value;
 }
 
 
-/// PawnInfoTable::evaluate_pawn_storm() evaluates each pawn which seems
-/// to have good chances of creating an open file by exchanging itself
-/// against an enemy pawn on an adjacent file.
+/// PawnInfo::updateShelter() calculates and caches king shelter. It is called
+/// only when king square changes, about 20% of total king_shelter() calls.
+template<Color Us>
+Score PawnInfo::updateShelter(const Position& pos, Square ksq) {
 
-template<Color Us, PawnInfoTable::SideType Side>
-int PawnInfoTable::evaluate_pawn_storm(Square s, Rank r, File f, Bitboard theirPawns) const {
+  const int Shift = (Us == WHITE ? 8 : -8);
 
-  const Bitboard StormFilesBB = (Side == KingSide ? FileFBB | FileGBB | FileHBB
-                                                  : FileABB | FileBBB | FileCBB);
-  const int K = (Side == KingSide ? 2 : 4);
-  const File RookFile = (Side == KingSide ? FILE_H : FILE_A);
+  Bitboard pawns;
+  int r, shelter = 0;
 
-  Bitboard b = attack_span_mask(Us, s) & theirPawns & StormFilesBB;
-  int bonus = 0;
-
-  while (b)
+  if (relative_rank(Us, ksq) <= RANK_4)
   {
-      // Give a bonus according to the distance of the nearest enemy pawn
-      Square s2 = pop_1st_bit(&b);
-      Rank r2 = square_rank(s2);
-      int v = StormLeverBonus[f] - K * rank_distance(r, r2);
-
-      // If enemy pawn has no pawn beside itself is particularly vulnerable.
-      // Big bonus, especially against a weakness on the rook file
-      if (!(theirPawns & neighboring_files_bb(s2) & rank_bb(s2)))
-          v *= (square_file(s2) == RookFile ? 4 : 2);
-
-      bonus += v;
+      pawns = pos.pieces(PAWN, Us) & this_and_neighboring_files_bb(file_of(ksq));
+      r = ksq & (7 << 3);
+      for (int i = 0; i < 3; i++)
+      {
+          r += Shift;
+          shelter += BitCount8Bit[(pawns >> r) & 0xFF] << (6 - i);
+      }
   }
-  return bonus;
+  kingSquares[Us] = ksq;
+  kingShelters[Us] = make_score(shelter, 0);
+  return kingShelters[Us];
 }
 
-
-/// PawnInfo::updateShelter calculates and caches king shelter. It is called
-/// only when king square changes, about 20% of total get_king_shelter() calls.
-int PawnInfo::updateShelter(const Position& pos, Color c, Square ksq) {
-
-  Bitboard pawns = pos.pieces(PAWN, c) & this_and_neighboring_files_bb(ksq);
-  unsigned shelter = 0;
-  unsigned r = ksq & (7 << 3);
-
-  for (int i = 1, k = (c ? -8 : 8); i < 4; i++)
-  {
-      r += k;
-      shelter += BitCount8Bit[(pawns >> r) & 0xFF] * (128 >> i);
-  }
-  kingSquares[c] = ksq;
-  kingShelters[c] = shelter;
-  return shelter;
-}
+// Explicit template instantiation
+template Score PawnInfo::updateShelter<WHITE>(const Position& pos, Square ksq);
+template Score PawnInfo::updateShelter<BLACK>(const Position& pos, Square ksq);

src/pawns.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,112 +17,78 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(PAWNS_H_INCLUDED)
 #define PAWNS_H_INCLUDED
 
-////
-//// Includes
-////
+#include "position.h"
+#include "tt.h"
+#include "types.h"
 
-#include "bitboard.h"
-#include "value.h"
-
-////
-//// Types
-////
+const int PawnTableSize = 16384;
 
 /// PawnInfo is a class which contains various information about a pawn
 /// structure. Currently, it only includes a middle game and an end game
 /// pawn structure evaluation, and a bitboard of passed pawns. We may want
-/// to add further information in the future. A lookup to the pawn hash table
-/// (performed by calling the get_pawn_info method in a PawnInfoTable object)
-/// returns a pointer to a PawnInfo object.
-class Position;
+/// to add further information in the future. A lookup to the pawn hash
+/// table (performed by calling the pawn_info method in a PawnInfoTable
+/// object) returns a pointer to a PawnInfo object.
 
 class PawnInfo {
 
   friend class PawnInfoTable;
 
 public:
-  PawnInfo() { clear(); }
-
   Score pawns_value() const;
-  Value kingside_storm_value(Color c) const;
-  Value queenside_storm_value(Color c) const;
   Bitboard pawn_attacks(Color c) const;
-  Bitboard passed_pawns() const;
+  Bitboard passed_pawns(Color c) const;
   int file_is_half_open(Color c, File f) const;
   int has_open_file_to_left(Color c, File f) const;
   int has_open_file_to_right(Color c, File f) const;
-  int get_king_shelter(const Position& pos, Color c, Square ksq);
 
-private:
-  void clear();
-  int updateShelter(const Position& pos, Color c, Square ksq);
-
-  Key key;
-  Bitboard passedPawns;
-  Bitboard pawnAttacks[2];
-  Square kingSquares[2];
-  Score value;
-  int16_t ksStormValue[2], qsStormValue[2];
-  uint8_t halfOpenFiles[2];
-  uint8_t kingShelters[2];
-};
-
-/// The PawnInfoTable class represents a pawn hash table.  It is basically
-/// just an array of PawnInfo objects and a few methods for accessing these
-/// objects.  The most important method is get_pawn_info, which looks up a
-/// position in the table and returns a pointer to a PawnInfo object.
-
-class PawnInfoTable {
-
-  enum SideType { KingSide, QueenSide };
-
-public:
-  PawnInfoTable(unsigned numOfEntries);
-  ~PawnInfoTable();
-  PawnInfo* get_pawn_info(const Position& pos) const;
+  template<Color Us>
+  Score king_shelter(const Position& pos, Square ksq);
 
 private:
   template<Color Us>
-  Score evaluate_pawns(const Position& pos, Bitboard ourPawns, Bitboard theirPawns, PawnInfo* pi) const;
+  Score updateShelter(const Position& pos, Square ksq);
 
-  template<Color Us, SideType Side>
-  int evaluate_pawn_storm(Square s, Rank r, File f, Bitboard theirPawns) const;
-
-  unsigned size;
-  PawnInfo* entries;
+  Key key;
+  Bitboard passedPawns[2];
+  Bitboard pawnAttacks[2];
+  Square kingSquares[2];
+  Score value;
+  int halfOpenFiles[2];
+  Score kingShelters[2];
 };
 
 
-////
-//// Inline functions
-////
+/// The PawnInfoTable class represents a pawn hash table. The most important
+/// method is pawn_info, which returns a pointer to a PawnInfo object.
+
+class PawnInfoTable : public SimpleHash<PawnInfo, PawnTableSize> {
+public:
+  PawnInfo* pawn_info(const Position& pos) const;
+
+private:
+  template<Color Us>
+  static Score evaluate_pawns(const Position& pos, Bitboard ourPawns, Bitboard theirPawns, PawnInfo* pi);
+};
+
 
 inline Score PawnInfo::pawns_value() const {
   return value;
 }
 
-inline Bitboard PawnInfo::passed_pawns() const {
-  return passedPawns;
-}
-
 inline Bitboard PawnInfo::pawn_attacks(Color c) const {
   return pawnAttacks[c];
 }
 
-inline Value PawnInfo::kingside_storm_value(Color c) const {
-  return Value(ksStormValue[c]);
-}
-
-inline Value PawnInfo::queenside_storm_value(Color c) const {
-  return Value(qsStormValue[c]);
+inline Bitboard PawnInfo::passed_pawns(Color c) const {
+  return passedPawns[c];
 }
 
 inline int PawnInfo::file_is_half_open(Color c, File f) const {
-  return (halfOpenFiles[c] & (1 << int(f)));
+  return halfOpenFiles[c] & (1 << int(f));
 }
 
 inline int PawnInfo::has_open_file_to_left(Color c, File f) const {
@@ -133,8 +99,9 @@ inline int PawnInfo::has_open_file_to_right(Color c, File f) const {
   return halfOpenFiles[c] & ~((1 << int(f+1)) - 1);
 }
 
-inline int PawnInfo::get_king_shelter(const Position& pos, Color c, Square ksq) {
-  return (kingSquares[c] == ksq ? kingShelters[c] : updateShelter(pos, c, ksq));
+template<Color Us>
+inline Score PawnInfo::king_shelter(const Position& pos, Square ksq) {
+  return kingSquares[Us] == ksq ? kingShelters[Us] : updateShelter<Us>(pos, ksq);
 }
 
 #endif // !defined(PAWNS_H_INCLUDED)

src/piece.cpp

@@ -1,49 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include <string>
-
-#include "piece.h"
-
-using namespace std;
-
-////
-//// Functions
-////
-
-/// Translating piece types to/from English piece letters
-
-static const string PieceChars(" pnbrqk PNBRQK");
-
-char piece_type_to_char(PieceType pt, bool upcase) {
-
-  return PieceChars[pt + int(upcase) * 7];
-}
-
-PieceType piece_type_from_char(char c) {
-
-  size_t idx = PieceChars.find(c);
-
-  return idx != string::npos ? PieceType(idx % 7) : NO_PIECE_TYPE;
-}

src/piece.h

@@ -1,107 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(PIECE_H_INCLUDED)
-#define PIECE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include "color.h"
-#include "square.h"
-
-
-////
-//// Types
-////
-
-enum PieceType {
-  NO_PIECE_TYPE = 0,
-  PAWN = 1, KNIGHT = 2, BISHOP = 3, ROOK = 4, QUEEN = 5, KING = 6
-};
-
-enum Piece {
-  NO_PIECE = 0, WP = 1, WN = 2, WB = 3, WR = 4, WQ = 5, WK = 6,
-  BP = 9, BN = 10, BB = 11, BR = 12, BQ = 13, BK = 14,
-  EMPTY = 16, OUTSIDE = 17
-};
-
-
-////
-//// Constants
-////
-
-const int SlidingArray[18] = {
-  0, 0, 0, 1, 2, 3, 0, 0, 0, 0, 0, 1, 2, 3, 0, 0, 0, 0
-};
-
-
-////
-//// Inline functions
-////
-
-inline Piece operator+ (Piece p, int i) { return Piece(int(p) + i); }
-inline void operator++ (Piece &p, int) { p = Piece(int(p) + 1); }
-inline Piece operator- (Piece p, int i) { return Piece(int(p) - i); }
-inline void operator-- (Piece &p, int) { p = Piece(int(p) - 1); }
-inline PieceType operator+ (PieceType p, int i) {return PieceType(int(p) + i);}
-inline void operator++ (PieceType &p, int) { p = PieceType(int(p) + 1); }
-inline PieceType operator- (PieceType p, int i) {return PieceType(int(p) - i);}
-inline void operator-- (PieceType &p, int) { p = PieceType(int(p) - 1); }
-
-inline PieceType type_of_piece(Piece p)  {
-  return PieceType(int(p) & 7);
-}
-
-inline Color color_of_piece(Piece p) {
-  return Color(int(p) >> 3);
-}
-
-inline Piece piece_of_color_and_type(Color c, PieceType pt) {
-  return Piece((int(c) << 3) | int(pt));
-}
-
-inline int piece_is_slider(Piece p) {
-  return SlidingArray[int(p)];
-}
-
-inline SquareDelta pawn_push(Color c) {
-    return (c == WHITE ? DELTA_N : DELTA_S);
-}
-
-inline bool piece_type_is_ok(PieceType pc) {
-  return pc >= PAWN && pc <= KING;
-}
-
-inline bool piece_is_ok(Piece pc) {
-  return piece_type_is_ok(type_of_piece(pc)) && color_is_ok(color_of_piece(pc));
-}
-
-
-////
-//// Prototypes
-////
-
-extern char piece_type_to_char(PieceType pt, bool upcase = false);
-extern PieceType piece_type_from_char(char c);
-
-
-#endif // !defined(PIECE_H_INCLUDED)

src/position.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,79 +17,26 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(POSITION_H_INCLUDED)
 #define POSITION_H_INCLUDED
 
-// Disable some silly and noisy warning from MSVC compiler
-#if defined(_MSC_VER)
-
-// Forcing value to bool 'true' or 'false' (performance warning)
-#pragma warning(disable: 4800)
-
-// Conditional expression is constant
-#pragma warning(disable: 4127)
-
-
-#endif
-
-////
-//// Includes
-////
+#include <cassert>
 
 #include "bitboard.h"
-#include "color.h"
-#include "direction.h"
-#include "move.h"
-#include "piece.h"
-#include "square.h"
-#include "value.h"
+#include "types.h"
 
 
-////
-//// Constants
-////
-
-/// FEN string for the initial position
-const std::string StartPosition = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
-
-/// Maximum number of plies per game (220 should be enough, because the
-/// maximum search depth is 100, and during position setup we reset the
-/// move counter for every non-reversible move).
-const int MaxGameLength = 220;
-
-
-////
-//// Types
-////
-
-/// struct checkInfo is initialized at c'tor time and keeps
-/// info used to detect if a move gives check.
+/// The checkInfo struct is initialized at c'tor time and keeps info used
+/// to detect if a move gives check.
+class Position;
 
 struct CheckInfo {
 
-    explicit CheckInfo(const Position&);
+  explicit CheckInfo(const Position&);
 
-    Bitboard dcCandidates;
-    Bitboard checkSq[8];
-    Square ksq;
-};
-
-/// Castle rights, encoded as bit fields
-
-enum CastleRights {
-  NO_CASTLES  = 0,
-  WHITE_OO    = 1,
-  BLACK_OO    = 2,
-  WHITE_OOO   = 4,
-  BLACK_OOO   = 8,
-  ALL_CASTLES = 15
-};
-
-/// Game phase
-enum Phase {
-  PHASE_ENDGAME = 0,
-  PHASE_MIDGAME = 128
+  Bitboard dcCandidates;
+  Bitboard pinned;
+  Bitboard checkSq[8];
 };
 
 
@@ -100,14 +47,14 @@ enum Phase {
 
 struct StateInfo {
   Key pawnKey, materialKey;
-  int castleRights, rule50, gamePly, pliesFromNull;
-  Square epSquare;
-  Score value;
   Value npMaterial[2];
+  int castleRights, rule50, pliesFromNull;
+  Score value;
+  Square epSquare;
 
-  PieceType capture;
   Key key;
   Bitboard checkersBB;
+  PieceType capturedType;
   StateInfo* previous;
 };
 
@@ -136,39 +83,24 @@ struct StateInfo {
 
 class Position {
 
-  friend class MaterialInfo;
-  friend class EndgameFunctions;
-
-  Position(); // No default or copy c'tor allowed
-  Position(const Position& pos);
+  // No copy c'tor or assignment operator allowed
+  Position(const Position&);
+  Position& operator=(const Position&);
 
 public:
-  enum GamePhase {
-      MidGame,
-      EndGame
-  };
-
-  // Constructors
-  explicit Position(int threadID);
-  Position(const Position& pos, int threadID);
-  Position(const std::string& fen, int threadID);
+  Position() {}
+  Position(const Position& pos, int th) { copy(pos, th); }
+  Position(const std::string& fen, bool isChess960, int th);
 
   // Text input/output
-  void from_fen(const std::string& fen);
+  void copy(const Position& pos, int th);
+  void from_fen(const std::string& fen, bool isChess960);
   const std::string to_fen() const;
   void print(Move m = MOVE_NONE) const;
 
-  // Copying
-  void flipped_copy(const Position& pos);
-
   // The piece on a given square
   Piece piece_on(Square s) const;
-  PieceType type_of_piece_on(Square s) const;
-  Color color_of_piece_on(Square s) const;
   bool square_is_empty(Square s) const;
-  bool square_is_occupied(Square s) const;
-  Value midgame_value_of_piece_on(Square s) const;
-  Value endgame_value_of_piece_on(Square s) const;
 
   // Side to move
   Color side_to_move() const;
@@ -176,7 +108,7 @@ public:
   // Bitboard representation of the position
   Bitboard empty_squares() const;
   Bitboard occupied_squares() const;
-  Bitboard pieces_of_color(Color c) const;
+  Bitboard pieces(Color c) const;
   Bitboard pieces(PieceType pt) const;
   Bitboard pieces(PieceType pt, Color c) const;
   Bitboard pieces(PieceType pt1, PieceType pt2) const;
@@ -192,68 +124,59 @@ public:
   Square king_square(Color c) const;
 
   // Castling rights
-  bool can_castle_kingside(Color c) const;
-  bool can_castle_queenside(Color c) const;
+  bool can_castle(CastleRight f) const;
   bool can_castle(Color c) const;
-  Square initial_kr_square(Color c) const;
-  Square initial_qr_square(Color c) const;
+  Square castle_rook_square(CastleRight f) const;
 
   // Bitboards for pinned pieces and discovered check candidates
-  Bitboard discovered_check_candidates(Color c) const;
-  Bitboard pinned_pieces(Color c) const;
+  Bitboard discovered_check_candidates() const;
+  Bitboard pinned_pieces() const;
 
   // Checking pieces and under check information
   Bitboard checkers() const;
-  bool is_check() const;
+  bool in_check() const;
 
   // Piece lists
-  Square piece_list(Color c, PieceType pt, int index) const;
-  const Square* piece_list_begin(Color c, PieceType pt) const;
+  const Square* piece_list(Color c, PieceType pt) const;
 
   // Information about attacks to or from a given square
   Bitboard attackers_to(Square s) const;
+  Bitboard attackers_to(Square s, Bitboard occ) const;
   Bitboard attacks_from(Piece p, Square s) const;
+  static Bitboard attacks_from(Piece p, Square s, Bitboard occ);
   template<PieceType> Bitboard attacks_from(Square s) const;
   template<PieceType> Bitboard attacks_from(Square s, Color c) const;
 
   // Properties of moves
-  bool pl_move_is_legal(Move m, Bitboard pinned) const;
-  bool pl_move_is_evasion(Move m, Bitboard pinned) const;
-  bool move_is_check(Move m) const;
-  bool move_is_check(Move m, const CheckInfo& ci) const;
-  bool move_is_capture(Move m) const;
-  bool move_is_capture_or_promotion(Move m) const;
-  bool move_is_passed_pawn_push(Move m) const;
+  bool move_gives_check(Move m, const CheckInfo& ci) const;
   bool move_attacks_square(Move m, Square s) const;
+  bool pl_move_is_legal(Move m, Bitboard pinned) const;
+  bool is_pseudo_legal(const Move m) const;
+  bool is_capture(Move m) const;
+  bool is_capture_or_promotion(Move m) const;
+  bool is_passed_pawn_push(Move m) const;
 
   // Piece captured with previous moves
-  PieceType captured_piece() const;
+  PieceType captured_piece_type() const;
 
   // Information about pawns
   bool pawn_is_passed(Color c, Square s) const;
 
-  // Weak squares
-  bool square_is_weak(Square s, Color c) const;
-
   // Doing and undoing moves
-  void detach();
   void do_move(Move m, StateInfo& st);
   void do_move(Move m, StateInfo& st, const CheckInfo& ci, bool moveIsCheck);
   void undo_move(Move m);
-  void do_null_move(StateInfo& st);
-  void undo_null_move();
+  template<bool Do> void do_null_move(StateInfo& st);
 
   // Static exchange evaluation
-  int see(Square from, Square to) const;
   int see(Move m) const;
-  int see(Square to) const;
   int see_sign(Move m) const;
 
   // Accessing hash keys
-  Key get_key() const;
-  Key get_exclusion_key() const;
-  Key get_pawn_key() const;
-  Key get_material_key() const;
+  Key key() const;
+  Key exclusion_key() const;
+  Key pawn_key() const;
+  Key material_key() const;
 
   // Incremental evaluation
   Score value() const;
@@ -262,47 +185,40 @@ public:
 
   // Game termination checks
   bool is_mate() const;
-  bool is_draw() const;
+  template<bool SkipRepetition> bool is_draw() const;
 
-  // Check if one side threatens a mate in one
-  bool has_mate_threat(Color c);
-
-  // Number of plies since the last non-reversible move
-  int rule_50_counter() const;
+  // Plies from start position to the beginning of search
+  int startpos_ply_counter() const;
 
   // Other properties of the position
   bool opposite_colored_bishops() const;
   bool has_pawn_on_7th(Color c) const;
+  bool is_chess960() const;
 
   // Current thread ID searching on the position
   int thread() const;
 
-  // Reset the gamePly variable to 0
-  void reset_game_ply();
+  int64_t nodes_searched() const;
+  void set_nodes_searched(int64_t n);
 
   // Position consistency check, for debugging
-  bool is_ok(int* failedStep = NULL) const;
+  bool pos_is_ok(int* failedStep = NULL) const;
+  void flip_me();
 
-  // Static member functions
-  static void init_zobrist();
-  static void init_piece_square_tables();
+  // Global initialization
+  static void init();
 
 private:
 
   // Initialization helper functions (used while setting up a position)
   void clear();
   void put_piece(Piece p, Square s);
-  void allow_oo(Color c);
-  void allow_ooo(Color c);
+  void set_castle_right(Square ksq, Square rsq);
+  bool move_is_legal(const Move m) const;
 
-  // Helper functions for doing and undoing moves
-  void do_capture_move(Key& key, PieceType capture, Color them, Square to, bool ep);
-  void do_castle_move(Move m);
-  void undo_castle_move(Move m);
-  void find_checkers();
-
-  template<bool FindPinned>
-  Bitboard hidden_checkers(Color c) const;
+  // Helper template functions
+  template<bool Do> void do_castle_move(Move m);
+  template<bool FindPinned> Bitboard hidden_checkers() const;
 
   // Computing hash keys from scratch (for initialization and debugging)
   Key compute_key() const;
@@ -310,72 +226,59 @@ private:
   Key compute_material_key() const;
 
   // Computing incremental evaluation scores and material counts
-  Score pst(Color c, PieceType pt, Square s) const;
+  Score pst(Piece p, Square s) const;
   Score compute_value() const;
   Value compute_non_pawn_material(Color c) const;
 
   // Board
-  Piece board[64];
+  Piece board[64];             // [square]
 
   // Bitboards
-  Bitboard byTypeBB[8], byColorBB[2];
+  Bitboard byTypeBB[8];        // [pieceType]
+  Bitboard byColorBB[2];       // [color]
+  Bitboard occupied;
 
   // Piece counts
-  int pieceCount[2][8]; // [color][pieceType]
+  int pieceCount[2][8];        // [color][pieceType]
 
   // Piece lists
-  Square pieceList[2][8][16]; // [color][pieceType][index]
-  int index[64]; // [square]
+  Square pieceList[2][8][16];  // [color][pieceType][index]
+  int index[64];               // [square]
 
   // Other info
-  Color sideToMove;
-  Key history[MaxGameLength];
-  int castleRightsMask[64];
+  int castleRightsMask[64];    // [square]
+  Square castleRookSquare[16]; // [castleRight]
   StateInfo startState;
-  File initialKFile, initialKRFile, initialQRFile;
+  int64_t nodes;
+  int startPosPly;
+  Color sideToMove;
   int threadID;
   StateInfo* st;
+  int chess960;
 
   // Static variables
-  static Key zobrist[2][8][64];
-  static Key zobEp[64];
-  static Key zobCastle[16];
+  static Score pieceSquareTable[16][64]; // [piece][square]
+  static Key zobrist[2][8][64];          // [color][pieceType][square]/[piece count]
+  static Key zobEp[64];                  // [square]
+  static Key zobCastle[16];              // [castleRight]
   static Key zobSideToMove;
-  static Score PieceSquareTable[16][64];
   static Key zobExclusion;
 };
 
+inline int64_t Position::nodes_searched() const {
+  return nodes;
+}
 
-////
-//// Inline functions
-////
+inline void Position::set_nodes_searched(int64_t n) {
+  nodes = n;
+}
 
 inline Piece Position::piece_on(Square s) const {
   return board[s];
 }
 
-inline Color Position::color_of_piece_on(Square s) const {
-  return color_of_piece(piece_on(s));
-}
-
-inline PieceType Position::type_of_piece_on(Square s) const {
-  return type_of_piece(piece_on(s));
-}
-
 inline bool Position::square_is_empty(Square s) const {
-  return piece_on(s) == EMPTY;
-}
-
-inline bool Position::square_is_occupied(Square s) const {
-  return !square_is_empty(s);
-}
-
-inline Value Position::midgame_value_of_piece_on(Square s) const {
-  return piece_value_midgame(piece_on(s));
-}
-
-inline Value Position::endgame_value_of_piece_on(Square s) const {
-  return piece_value_endgame(piece_on(s));
+  return board[s] == NO_PIECE;
 }
 
 inline Color Position::side_to_move() const {
@@ -383,14 +286,14 @@ inline Color Position::side_to_move() const {
 }
 
 inline Bitboard Position::occupied_squares() const {
-  return byTypeBB[0];
+  return occupied;
 }
 
 inline Bitboard Position::empty_squares() const {
-  return ~(occupied_squares());
+  return ~occupied;
 }
 
-inline Bitboard Position::pieces_of_color(Color c) const {
+inline Bitboard Position::pieces(Color c) const {
   return byColorBB[c];
 }
 
@@ -414,11 +317,7 @@ inline int Position::piece_count(Color c, PieceType pt) const {
   return pieceCount[c][pt];
 }
 
-inline Square Position::piece_list(Color c, PieceType pt, int idx) const {
-  return pieceList[c][pt][idx];
-}
-
-inline const Square* Position::piece_list_begin(Color c, PieceType pt) const {
+inline const Square* Position::piece_list(Color c, PieceType pt) const {
   return pieceList[c][pt];
 }
 
@@ -430,34 +329,26 @@ inline Square Position::king_square(Color c) const {
   return pieceList[c][KING][0];
 }
 
-inline bool Position::can_castle_kingside(Color side) const {
-  return st->castleRights & (1+int(side));
+inline bool Position::can_castle(CastleRight f) const {
+  return st->castleRights & f;
 }
 
-inline bool Position::can_castle_queenside(Color side) const {
-  return st->castleRights & (4+4*int(side));
+inline bool Position::can_castle(Color c) const {
+  return st->castleRights & ((WHITE_OO | WHITE_OOO) << c);
 }
 
-inline bool Position::can_castle(Color side) const {
-  return can_castle_kingside(side) || can_castle_queenside(side);
-}
-
-inline Square Position::initial_kr_square(Color c) const {
-  return relative_square(c, make_square(initialKRFile, RANK_1));
-}
-
-inline Square Position::initial_qr_square(Color c) const {
-  return relative_square(c, make_square(initialQRFile, RANK_1));
+inline Square Position::castle_rook_square(CastleRight f) const {
+  return castleRookSquare[f];
 }
 
 template<>
 inline Bitboard Position::attacks_from<PAWN>(Square s, Color c) const {
-  return StepAttackBB[piece_of_color_and_type(c, PAWN)][s];
+  return StepAttacksBB[make_piece(c, PAWN)][s];
 }
 
 template<PieceType Piece> // Knight and King and white pawns
 inline Bitboard Position::attacks_from(Square s) const {
-  return StepAttackBB[Piece][s];
+  return StepAttacksBB[Piece][s];
 }
 
 template<>
@@ -475,44 +366,56 @@ inline Bitboard Position::attacks_from<QUEEN>(Square s) const {
   return attacks_from<ROOK>(s) | attacks_from<BISHOP>(s);
 }
 
+inline Bitboard Position::attacks_from(Piece p, Square s) const {
+  return attacks_from(p, s, occupied_squares());
+}
+
+inline Bitboard Position::attackers_to(Square s) const {
+  return attackers_to(s, occupied_squares());
+}
+
 inline Bitboard Position::checkers() const {
   return st->checkersBB;
 }
 
-inline bool Position::is_check() const {
-  return st->checkersBB != EmptyBoardBB;
+inline bool Position::in_check() const {
+  return st->checkersBB != 0;
+}
+
+inline Bitboard Position::discovered_check_candidates() const {
+  return hidden_checkers<false>();
+}
+
+inline Bitboard Position::pinned_pieces() const {
+  return hidden_checkers<true>();
 }
 
 inline bool Position::pawn_is_passed(Color c, Square s) const {
-  return !(pieces(PAWN, opposite_color(c)) & passed_pawn_mask(c, s));
+  return !(pieces(PAWN, flip(c)) & passed_pawn_mask(c, s));
 }
 
-inline bool Position::square_is_weak(Square s, Color c) const {
-  return !(pieces(PAWN, opposite_color(c)) & attack_span_mask(c, s));
-}
-
-inline Key Position::get_key() const {
+inline Key Position::key() const {
   return st->key;
 }
 
-inline Key Position::get_exclusion_key() const {
+inline Key Position::exclusion_key() const {
   return st->key ^ zobExclusion;
 }
 
-inline Key Position::get_pawn_key() const {
+inline Key Position::pawn_key() const {
   return st->pawnKey;
 }
 
-inline Key Position::get_material_key() const {
+inline Key Position::material_key() const {
   return st->materialKey;
 }
 
-inline Score Position::pst(Color c, PieceType pt, Square s) const {
-  return PieceSquareTable[piece_of_color_and_type(c, pt)][s];
+inline Score Position::pst(Piece p, Square s) const {
+  return pieceSquareTable[p][s];
 }
 
 inline Score Position::pst_delta(Piece piece, Square from, Square to) const {
-  return PieceSquareTable[piece][to] - PieceSquareTable[piece][from];
+  return pieceSquareTable[piece][to] - pieceSquareTable[piece][from];
 }
 
 inline Score Position::value() const {
@@ -523,44 +426,46 @@ inline Value Position::non_pawn_material(Color c) const {
   return st->npMaterial[c];
 }
 
-inline bool Position::move_is_passed_pawn_push(Move m) const {
+inline bool Position::is_passed_pawn_push(Move m) const {
 
-  Color c = side_to_move();
-  return   piece_on(move_from(m)) == piece_of_color_and_type(c, PAWN)
-        && pawn_is_passed(c, move_to(m));
+  return   board[from_sq(m)] == make_piece(sideToMove, PAWN)
+        && pawn_is_passed(sideToMove, to_sq(m));
 }
 
-inline int Position::rule_50_counter() const {
-
-  return st->rule50;
+inline int Position::startpos_ply_counter() const {
+  return startPosPly + st->pliesFromNull; // HACK
 }
 
 inline bool Position::opposite_colored_bishops() const {
 
-  return   piece_count(WHITE, BISHOP) == 1
-        && piece_count(BLACK, BISHOP) == 1
-        && square_color(piece_list(WHITE, BISHOP, 0)) != square_color(piece_list(BLACK, BISHOP, 0));
+  return   pieceCount[WHITE][BISHOP] == 1
+        && pieceCount[BLACK][BISHOP] == 1
+        && opposite_colors(pieceList[WHITE][BISHOP][0], pieceList[BLACK][BISHOP][0]);
 }
 
 inline bool Position::has_pawn_on_7th(Color c) const {
-
-  return pieces(PAWN, c) & relative_rank_bb(c, RANK_7);
+  return pieces(PAWN, c) & rank_bb(relative_rank(c, RANK_7));
 }
 
-inline bool Position::move_is_capture(Move m) const {
-
-  // Move must not be MOVE_NONE !
-  return (m & (3 << 15)) ? !move_is_castle(m) : !square_is_empty(move_to(m));
+inline bool Position::is_chess960() const {
+  return chess960;
 }
 
-inline bool Position::move_is_capture_or_promotion(Move m) const {
+inline bool Position::is_capture_or_promotion(Move m) const {
 
-  // Move must not be MOVE_NONE !
-  return (m & (0x1F << 12)) ? !move_is_castle(m) : !square_is_empty(move_to(m));
+  assert(is_ok(m));
+  return is_special(m) ? !is_castle(m) : !square_is_empty(to_sq(m));
 }
 
-inline PieceType Position::captured_piece() const {
-  return st->capture;
+inline bool Position::is_capture(Move m) const {
+
+  // Note that castle is coded as "king captures the rook"
+  assert(is_ok(m));
+  return (!square_is_empty(to_sq(m)) && !is_castle(m)) || is_enpassant(m);
+}
+
+inline PieceType Position::captured_piece_type() const {
+  return st->capturedType;
 }
 
 inline int Position::thread() const {

src/psqtab.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,172 +17,82 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(PSQTAB_H_INCLUDED)
 #define PSQTAB_H_INCLUDED
 
-////
-//// Includes
-////
+#include "types.h"
 
-#include "value.h"
+#define S(mg, eg) make_score(mg, eg)
 
 
-////
-//// Constants modified by Joona Kiiski
-////
+/// PSQT[PieceType][Square] contains Piece-Square scores. For each piece type on
+/// a given square a (midgame, endgame) score pair is assigned. PSQT is defined
+/// for white side, for black side the tables are symmetric.
 
-static const Value MP = PawnValueMidgame;
-static const Value MK = KnightValueMidgame;
-static const Value MB = BishopValueMidgame;
-static const Value MR = RookValueMidgame;
-static const Value MQ = QueenValueMidgame;
-
-static const int MgPST[][64] = {
+static const Score PSQT[][64] = {
   { },
-  {// Pawn
-   // A      B      C     D      E      F      G     H
-        0,    0,     0,     0,     0,     0,    0,     0,
-    MP-28, MP-6, MP+ 4, MP+14, MP+14, MP+ 4, MP-6, MP-28,
-    MP-28, MP-6, MP+ 9, MP+36, MP+36, MP+ 9, MP-6, MP-28,
-    MP-28, MP-6, MP+17, MP+58, MP+58, MP+17, MP-6, MP-28,
-    MP-28, MP-6, MP+17, MP+36, MP+36, MP+17, MP-6, MP-28,
-    MP-28, MP-6, MP+ 9, MP+14, MP+14, MP+ 9, MP-6, MP-28,
-    MP-28, MP-6, MP+ 4, MP+14, MP+14, MP+ 4, MP-6, MP-28,
-        0,    0,     0,     0,     0,     0,    0,     0
+  { // Pawn
+   S(  0, 0), S( 0, 0), S( 0, 0), S( 0, 0), S(0,  0), S( 0, 0), S( 0, 0), S(  0, 0),
+   S(-28,-8), S(-6,-8), S( 4,-8), S(14,-8), S(14,-8), S( 4,-8), S(-6,-8), S(-28,-8),
+   S(-28,-8), S(-6,-8), S( 9,-8), S(36,-8), S(36,-8), S( 9,-8), S(-6,-8), S(-28,-8),
+   S(-28,-8), S(-6,-8), S(17,-8), S(58,-8), S(58,-8), S(17,-8), S(-6,-8), S(-28,-8),
+   S(-28,-8), S(-6,-8), S(17,-8), S(36,-8), S(36,-8), S(17,-8), S(-6,-8), S(-28,-8),
+   S(-28,-8), S(-6,-8), S( 9,-8), S(14,-8), S(14,-8), S( 9,-8), S(-6,-8), S(-28,-8),
+   S(-28,-8), S(-6,-8), S( 4,-8), S(14,-8), S(14,-8), S( 4,-8), S(-6,-8), S(-28,-8),
+   S(  0, 0), S( 0, 0), S( 0, 0), S( 0, 0), S(0,  0), S( 0, 0), S( 0, 0), S(  0, 0)
   },
-  {// Knight
-   //  A      B       C      D      E      F      G       H
-    MK-135, MK-107, MK-80, MK-67, MK-67, MK-80, MK-107, MK-135,
-    MK- 93, MK- 67, MK-39, MK-25, MK-25, MK-39, MK- 67, MK- 93,
-    MK- 53, MK- 25, MK+ 1, MK+13, MK+13, MK+ 1, MK- 25, MK- 53,
-    MK- 25, MK+  1, MK+27, MK+41, MK+41, MK+27, MK+  1, MK- 25,
-    MK- 11, MK+ 13, MK+41, MK+55, MK+55, MK+41, MK+ 13, MK- 11,
-    MK- 11, MK+ 13, MK+41, MK+55, MK+55, MK+41, MK+ 13, MK- 11,
-    MK- 53, MK- 25, MK+ 1, MK+13, MK+13, MK+ 1, MK- 25, MK- 53,
-    MK-193, MK- 67, MK-39, MK-25, MK-25, MK-39, MK- 67, MK-193
+  { // Knight
+   S(-135,-104), S(-107,-79), S(-80,-55), S(-67,-42), S(-67,-42), S(-80,-55), S(-107,-79), S(-135,-104),
+   S( -93, -79), S( -67,-55), S(-39,-30), S(-25,-17), S(-25,-17), S(-39,-30), S( -67,-55), S( -93, -79),
+   S( -53, -55), S( -25,-30), S(  1, -6), S( 13,  5), S( 13,  5), S(  1, -6), S( -25,-30), S( -53, -55),
+   S( -25, -42), S(   1,-17), S( 27,  5), S( 41, 18), S( 41, 18), S( 27,  5), S(   1,-17), S( -25, -42),
+   S( -11, -42), S(  13,-17), S( 41,  5), S( 55, 18), S( 55, 18), S( 41,  5), S(  13,-17), S( -11, -42),
+   S( -11, -55), S(  13,-30), S( 41, -6), S( 55,  5), S( 55,  5), S( 41, -6), S(  13,-30), S( -11, -55),
+   S( -53, -79), S( -25,-55), S(  1,-30), S( 13,-17), S( 13,-17), S(  1,-30), S( -25,-55), S( -53, -79),
+   S(-193,-104), S( -67,-79), S(-39,-55), S(-25,-42), S(-25,-42), S(-39,-55), S( -67,-79), S(-193,-104)
   },
-  {// Bishop
-   // A      B      C      D      E      F      G      H
-    MB-40, MB-40, MB-35, MB-30, MB-30, MB-35, MB-40, MB-40,
-    MB-17, MB+ 0, MB- 4, MB+ 0, MB+ 0, MB- 4, MB+ 0, MB-17,
-    MB-13, MB- 4, MB+ 8, MB+ 4, MB+ 4, MB+ 8, MB- 4, MB-13,
-    MB- 8, MB+ 0, MB+ 4, MB+17, MB+17, MB+ 4, MB+ 0, MB- 8,
-    MB- 8, MB+ 0, MB+ 4, MB+17, MB+17, MB+ 4, MB+ 0, MB- 8,
-    MB-13, MB- 4, MB+ 8, MB+ 4, MB+ 4, MB+ 8, MB- 4, MB-13,
-    MB-17, MB+ 0, MB- 4, MB+ 0, MB+ 0, MB- 4, MB+ 0, MB-17,
-    MB-17, MB-17, MB-13, MB- 8, MB- 8, MB-13, MB-17, MB-17
+  { // Bishop
+   S(-40,-59), S(-40,-42), S(-35,-35), S(-30,-26), S(-30,-26), S(-35,-35), S(-40,-42), S(-40,-59),
+   S(-17,-42), S(  0,-26), S( -4,-18), S(  0,-11), S(  0,-11), S( -4,-18), S(  0,-26), S(-17,-42),
+   S(-13,-35), S( -4,-18), S(  8,-11), S(  4, -4), S(  4, -4), S(  8,-11), S( -4,-18), S(-13,-35),
+   S( -8,-26), S(  0,-11), S(  4, -4), S( 17,  4), S( 17,  4), S(  4, -4), S(  0,-11), S( -8,-26),
+   S( -8,-26), S(  0,-11), S(  4, -4), S( 17,  4), S( 17,  4), S(  4, -4), S(  0,-11), S( -8,-26),
+   S(-13,-35), S( -4,-18), S(  8,-11), S(  4, -4), S(  4, -4), S(  8,-11), S( -4,-18), S(-13,-35),
+   S(-17,-42), S(  0,-26), S( -4,-18), S(  0,-11), S(  0,-11), S( -4,-18), S(  0,-26), S(-17,-42),
+   S(-17,-59), S(-17,-42), S(-13,-35), S( -8,-26), S( -8,-26), S(-13,-35), S(-17,-42), S(-17,-59)
   },
-  {// Rook
-   // A      B     C     D     E     F     G     H
-    MR-12, MR-7, MR-2, MR+2, MR+2, MR-2, MR-7, MR-12,
-    MR-12, MR-7, MR-2, MR+2, MR+2, MR-2, MR-7, MR-12,
-    MR-12, MR-7, MR-2, MR+2, MR+2, MR-2, MR-7, MR-12,
-    MR-12, MR-7, MR-2, MR+2, MR+2, MR-2, MR-7, MR-12,
-    MR-12, MR-7, MR-2, MR+2, MR+2, MR-2, MR-7, MR-12,
-    MR-12, MR-7, MR-2, MR+2, MR+2, MR-2, MR-7, MR-12,
-    MR-12, MR-7, MR-2, MR+2, MR+2, MR-2, MR-7, MR-12,
-    MR-12, MR-7, MR-2, MR+2, MR+2, MR-2, MR-7, MR-12
+  { // Rook
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3),
+   S(-12, 3), S(-7, 3), S(-2, 3), S(2, 3), S(2, 3), S(-2, 3), S(-7, 3), S(-12, 3)
   },
-  {// Queen
-   // A     B     C     D     E     F     G     H
-    MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8,
-    MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8,
-    MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8,
-    MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8,
-    MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8,
-    MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8,
-    MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8,
-    MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8, MQ+8
+  { // Queen
+   S(8,-80), S(8,-54), S(8,-42), S(8,-30), S(8,-30), S(8,-42), S(8,-54), S(8,-80),
+   S(8,-54), S(8,-30), S(8,-18), S(8, -6), S(8, -6), S(8,-18), S(8,-30), S(8,-54),
+   S(8,-42), S(8,-18), S(8, -6), S(8,  6), S(8,  6), S(8, -6), S(8,-18), S(8,-42),
+   S(8,-30), S(8, -6), S(8,  6), S(8, 18), S(8, 18), S(8,  6), S(8, -6), S(8,-30),
+   S(8,-30), S(8, -6), S(8,  6), S(8, 18), S(8, 18), S(8,  6), S(8, -6), S(8,-30),
+   S(8,-42), S(8,-18), S(8, -6), S(8,  6), S(8,  6), S(8, -6), S(8,-18), S(8,-42),
+   S(8,-54), S(8,-30), S(8,-18), S(8, -6), S(8, -6), S(8,-18), S(8,-30), S(8,-54),
+   S(8,-80), S(8,-54), S(8,-42), S(8,-30), S(8,-30), S(8,-42), S(8,-54), S(8,-80)
   },
-  {// King
-   //A    B    C    D    E    F    G    H
-    287, 311, 262, 214, 214, 262, 311, 287,
-    262, 287, 238, 190, 190, 238, 287, 262,
-    214, 238, 190, 142, 142, 190, 238, 214,
-    190, 214, 167, 119, 119, 167, 214, 190,
-    167, 190, 142,  94,  94, 142, 190, 167,
-    142, 167, 119,  69,  69, 119, 167, 142,
-    119, 142,  94,  46,  46,  94, 142, 119,
-     94, 119,  69,  21,  21,  69, 119,  94
-  }
-};
-
-static const Value EP = PawnValueEndgame;
-static const Value EK = KnightValueEndgame;
-static const Value EB = BishopValueEndgame;
-static const Value ER = RookValueEndgame;
-static const Value EQ = QueenValueEndgame;
-
-static const int EgPST[][64] = {
-  { },
-  {// Pawn
-   // A     B     C     D     E     F     G     H
-       0,    0,    0,    0,    0,    0,    0,    0,
-    EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8,
-    EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8,
-    EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8,
-    EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8,
-    EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8,
-    EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8, EP-8,
-       0,    0,    0,    0,    0,    0,    0,    0
-  },
-  {// Knight
-   // A       B      C      D      E      F      G      H
-    EK-104, EK-79, EK-55, EK-42, EK-42, EK-55, EK-79, EK-104,
-    EK- 79, EK-55, EK-30, EK-17, EK-17, EK-30, EK-55, EK- 79,
-    EK- 55, EK-30, EK- 6, EK+ 5, EK+ 5, EK- 6, EK-30, EK- 55,
-    EK- 42, EK-17, EK+ 5, EK+18, EK+18, EK+ 5, EK-17, EK- 42,
-    EK- 42, EK-17, EK+ 5, EK+18, EK+18, EK+ 5, EK-17, EK- 42,
-    EK- 55, EK-30, EK- 6, EK+ 5, EK+ 5, EK- 6, EK-30, EK- 55,
-    EK- 79, EK-55, EK-30, EK-17, EK-17, EK-30, EK-55, EK- 79,
-    EK-104, EK-79, EK-55, EK-42, EK-42, EK-55, EK-79, EK-104
-  },
-  {// Bishop
-   // A      B      C      D      E      F      G      H
-    EB-59, EB-42, EB-35, EB-26, EB-26, EB-35, EB-42, EB-59,
-    EB-42, EB-26, EB-18, EB-11, EB-11, EB-18, EB-26, EB-42,
-    EB-35, EB-18, EB-11, EB- 4, EB- 4, EB-11, EB-18, EB-35,
-    EB-26, EB-11, EB- 4, EB+ 4, EB+ 4, EB- 4, EB-11, EB-26,
-    EB-26, EB-11, EB- 4, EB+ 4, EB+ 4, EB- 4, EB-11, EB-26,
-    EB-35, EB-18, EB-11, EB- 4, EB- 4, EB-11, EB-18, EB-35,
-    EB-42, EB-26, EB-18, EB-11, EB-11, EB-18, EB-26, EB-42,
-    EB-59, EB-42, EB-35, EB-26, EB-26, EB-35, EB-42, EB-59
-  },
-  {// Rook
-   // A     B     C     D     E     F     G     H
-    ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3,
-    ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3,
-    ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3,
-    ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3,
-    ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3,
-    ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3,
-    ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3,
-    ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3, ER+3
-  },
-  {// Queen
-   // A      B      C      D      E      F      G      H
-    EQ-80, EQ-54, EQ-42, EQ-30, EQ-30, EQ-42, EQ-54, EQ-80,
-    EQ-54, EQ-30, EQ-18, EQ- 6, EQ- 6, EQ-18, EQ-30, EQ-54,
-    EQ-42, EQ-18, EQ- 6, EQ+ 6, EQ+ 6, EQ- 6, EQ-18, EQ-42,
-    EQ-30, EQ- 6, EQ+ 6, EQ+18, EQ+18, EQ+ 6, EQ- 6, EQ-30,
-    EQ-30, EQ- 6, EQ+ 6, EQ+18, EQ+18, EQ+ 6, EQ- 6, EQ-30,
-    EQ-42, EQ-18, EQ- 6, EQ+ 6, EQ+ 6, EQ- 6, EQ-18, EQ-42,
-    EQ-54, EQ-30, EQ-18, EQ- 6, EQ- 6, EQ-18, EQ-30, EQ-54,
-    EQ-80, EQ-54, EQ-42, EQ-30, EQ-30, EQ-42, EQ-54, EQ-80
-  },
-  {// King
-   //A    B    C    D    E    F    G    H
-     18,  77, 105, 135, 135, 105,  77,  18,
-     77, 135, 165, 193, 193, 165, 135,  77,
-    105, 165, 193, 222, 222, 193, 165, 105,
-    135, 193, 222, 251, 251, 222, 193, 135,
-    135, 193, 222, 251, 251, 222, 193, 135,
-    105, 165, 193, 222, 222, 193, 165, 105,
-     77, 135, 165, 193, 193, 165, 135,  77,
-     18,  77, 105, 135, 135, 105,  77,  18
+  { // King
+   S(287, 18), S(311, 77), S(262,105), S(214,135), S(214,135), S(262,105), S(311, 77), S(287, 18),
+   S(262, 77), S(287,135), S(238,165), S(190,193), S(190,193), S(238,165), S(287,135), S(262, 77),
+   S(214,105), S(238,165), S(190,193), S(142,222), S(142,222), S(190,193), S(238,165), S(214,105),
+   S(190,135), S(214,193), S(167,222), S(119,251), S(119,251), S(167,222), S(214,193), S(190,135),
+   S(167,135), S(190,193), S(142,222), S( 94,251), S( 94,251), S(142,222), S(190,193), S(167,135),
+   S(142,105), S(167,165), S(119,193), S( 69,222), S( 69,222), S(119,193), S(167,165), S(142,105),
+   S(119, 77), S(142,135), S( 94,165), S( 46,193), S( 46,193), S( 94,165), S(142,135), S(119, 77),
+   S(94,  18), S(119, 77), S( 69,105), S( 21,135), S( 21,135), S( 69,105), S(119, 77), S( 94, 18)
   }
 };
 
+#undef S
 
 #endif // !defined(PSQTAB_H_INCLUDED)

src/rkiss.h

@@ -0,0 +1,78 @@
+/*
+  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+
+  Stockfish is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Stockfish is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+  This file is based on original code by Heinz van Saanen and is
+  available under the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+*/
+
+#if !defined(RKISS_H_INCLUDED)
+#define RKISS_H_INCLUDED
+
+#include "types.h"
+
+/// RKISS is our pseudo random number generator (PRNG) used to compute hash keys.
+/// George Marsaglia invented the RNG-Kiss-family in the early 90's. This is a
+/// specific version that Heinz van Saanen derived from some public domain code
+/// by Bob Jenkins. Following the feature list, as tested by Heinz.
+///
+/// - Quite platform independent
+/// - Passes ALL dieharder tests! Here *nix sys-rand() e.g. fails miserably:-)
+/// - ~12 times faster than my *nix sys-rand()
+/// - ~4 times faster than SSE2-version of Mersenne twister
+/// - Average cycle length: ~2^126
+/// - 64 bit seed
+/// - Return doubles with a full 53 bit mantissa
+/// - Thread safe
+
+class RKISS {
+
+  // Keep variables always together
+  struct S { uint64_t a, b, c, d; } s;
+
+  uint64_t rotate(uint64_t x, uint64_t k) const {
+    return (x << k) | (x >> (64 - k));
+  }
+
+  // Return 64 bit unsigned integer in between [0, 2^64 - 1]
+  uint64_t rand64() {
+
+    const uint64_t
+      e = s.a - rotate(s.b,  7);
+    s.a = s.b ^ rotate(s.c, 13);
+    s.b = s.c + rotate(s.d, 37);
+    s.c = s.d + e;
+    return s.d = e + s.a;
+  }
+
+  // Init seed and scramble a few rounds
+  void raninit() {
+
+    s.a = 0xf1ea5eed;
+    s.b = s.c = s.d = 0xd4e12c77;
+    for (int i = 0; i < 73; i++)
+        rand64();
+  }
+
+public:
+  RKISS() { raninit(); }
+  template<typename T> T rand() { return T(rand64()); }
+};
+
+#endif // !defined(RKISS_H_INCLUDED)

src/san.cpp

@@ -1,440 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include <cassert>
-#include <cstring>
-#include <iomanip>
-#include <string>
-#include <sstream>
-
-#include "history.h"
-#include "movepick.h"
-#include "san.h"
-
-using std::string;
-
-////
-//// Local definitions
-////
-
-namespace {
-
-  enum Ambiguity {
-    AMBIGUITY_NONE,
-    AMBIGUITY_FILE,
-    AMBIGUITY_RANK,
-    AMBIGUITY_BOTH
-  };
-
-  const History H; // Used as dummy argument for MovePicker c'tor
-
-  Ambiguity move_ambiguity(const Position& pos, Move m);
-  const string time_string(int milliseconds);
-  const string score_string(Value v);
-}
-
-
-////
-//// Functions
-////
-
-/// move_to_san() takes a position and a move as input, where it is assumed
-/// that the move is a legal move from the position. The return value is
-/// a string containing the move in short algebraic notation.
-
-const string move_to_san(Position& pos, Move m) {
-
-  assert(pos.is_ok());
-  assert(move_is_ok(m));
-
-  string san;
-  Square from = move_from(m);
-  Square to = move_to(m);
-  PieceType pt = type_of_piece(pos.piece_on(move_from(m)));
-
-  if (m == MOVE_NONE)
-      return "(none)";
-  else if (m == MOVE_NULL)
-      return "(null)";
-  else if (move_is_long_castle(m)  || (int(to - from) == -2 && pt == KING))
-      san = "O-O-O";
-  else if (move_is_short_castle(m) || (int(to - from) ==  2 && pt == KING))
-      san = "O-O";
-  else
-  {
-      if (pt != PAWN)
-      {
-          san += piece_type_to_char(pt, true);
-
-          switch (move_ambiguity(pos, m)) {
-          case AMBIGUITY_NONE:
-            break;
-          case AMBIGUITY_FILE:
-            san += file_to_char(square_file(from));
-            break;
-          case AMBIGUITY_RANK:
-            san += rank_to_char(square_rank(from));
-            break;
-          case AMBIGUITY_BOTH:
-            san += square_to_string(from);
-            break;
-          default:
-            assert(false);
-          }
-      }
-      if (pos.move_is_capture(m))
-      {
-          if (pt == PAWN)
-              san += file_to_char(square_file(move_from(m)));
-          san += "x";
-      }
-      san += square_to_string(move_to(m));
-      if (move_is_promotion(m))
-      {
-          san += "=";
-          san += piece_type_to_char(move_promotion_piece(m), true);
-      }
-  }
-
-  // The move gives check ? We don't use pos.move_is_check() here
-  // because we need to test for mate after the move is done.
-  StateInfo st;
-  pos.do_move(m, st);
-  if (pos.is_check())
-      san += pos.is_mate() ? "#" : "+";
-  pos.undo_move(m);
-
-  return san;
-}
-
-
-/// move_from_san() takes a position and a string as input, and tries to
-/// interpret the string as a move in short algebraic notation. On success,
-/// the move is returned.  On failure (i.e. if the string is unparsable, or
-/// if the move is illegal or ambiguous), MOVE_NONE is returned.
-
-Move move_from_san(const Position& pos, const string& movestr) {
-
-  assert(pos.is_ok());
-
-  MovePicker mp = MovePicker(pos, MOVE_NONE, OnePly, H);
-  Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
-
-  // Castling moves
-  if (movestr == "O-O-O" || movestr == "O-O-O+")
-  {
-      Move m;
-      while ((m = mp.get_next_move()) != MOVE_NONE)
-          if (move_is_long_castle(m) && pos.pl_move_is_legal(m, pinned))
-              return m;
-
-      return MOVE_NONE;
-  }
-  else if (movestr == "O-O" || movestr == "O-O+")
-  {
-      Move m;
-      while ((m = mp.get_next_move()) != MOVE_NONE)
-          if (move_is_short_castle(m) && pos.pl_move_is_legal(m, pinned))
-              return m;
-
-    return MOVE_NONE;
-  }
-
-  // Normal moves. We use a simple FSM to parse the san string.
-  enum { START, TO_FILE, TO_RANK, PROMOTION_OR_CHECK, PROMOTION, CHECK, END };
-  static const string pieceLetters = "KQRBN";
-  PieceType pt = NO_PIECE_TYPE, promotion = NO_PIECE_TYPE;
-  File fromFile = FILE_NONE, toFile = FILE_NONE;
-  Rank fromRank = RANK_NONE, toRank = RANK_NONE;
-  Square to;
-  int state = START;
-
-  for (size_t i = 0; i < movestr.length(); i++)
-  {
-      char type, c = movestr[i];
-      if (pieceLetters.find(c) != string::npos)
-          type = 'P';
-      else if (c >= 'a' && c <= 'h')
-          type = 'F';
-      else if (c >= '1' && c <= '8')
-          type = 'R';
-      else
-          type = c;
-
-      switch (type) {
-      case 'P':
-          if (state == START)
-          {
-              pt = piece_type_from_char(c);
-              state = TO_FILE;
-          }
-          else if (state == PROMOTION)
-          {
-              promotion = piece_type_from_char(c);
-              state = (i < movestr.length() - 1) ? CHECK : END;
-          }
-          else
-              return MOVE_NONE;
-          break;
-      case 'F':
-          if (state == START)
-          {
-              pt = PAWN;
-              fromFile = toFile = file_from_char(c);
-              state = TO_RANK;
-          }
-          else if (state == TO_FILE)
-          {
-              toFile = file_from_char(c);
-              state = TO_RANK;
-          }
-          else if (state == TO_RANK && toFile != FILE_NONE)
-          {
-              // Previous file was for disambiguation
-              fromFile = toFile;
-              toFile = file_from_char(c);
-          }
-          else
-              return MOVE_NONE;
-          break;
-      case 'R':
-          if (state == TO_RANK)
-          {
-              toRank = rank_from_char(c);
-              state = (i < movestr.length() - 1) ? PROMOTION_OR_CHECK : END;
-          }
-          else if (state == TO_FILE && fromRank == RANK_NONE)
-          {
-              // It's a disambiguation rank instead of a file
-              fromRank = rank_from_char(c);
-          }
-          else
-              return MOVE_NONE;
-          break;
-      case 'x': case 'X':
-          if (state == TO_RANK)
-          {
-              // Previous file was for disambiguation, or it's a pawn capture
-              fromFile = toFile;
-              state = TO_FILE;
-          }
-          else if (state != TO_FILE)
-              return MOVE_NONE;
-          break;
-      case '=':
-          if (state == PROMOTION_OR_CHECK)
-              state = PROMOTION;
-          else
-              return MOVE_NONE;
-          break;
-      case '+': case '#':
-          if (state == PROMOTION_OR_CHECK || state == CHECK)
-              state = END;
-          else
-              return MOVE_NONE;
-          break;
-      default:
-          return MOVE_NONE;
-          break;
-      }
-  }
-
-  if (state != END)
-      return MOVE_NONE;
-
-  // Look for a matching move
-  Move m, move = MOVE_NONE;
-  to = make_square(toFile, toRank);
-  int matches = 0;
-
-  while ((m = mp.get_next_move()) != MOVE_NONE)
-      if (   pos.type_of_piece_on(move_from(m)) == pt
-          && move_to(m) == to
-          && move_promotion_piece(m) == promotion
-          && (fromFile == FILE_NONE || fromFile == square_file(move_from(m)))
-          && (fromRank == RANK_NONE || fromRank == square_rank(move_from(m))))
-      {
-          move = m;
-          matches++;
-      }
-  return (matches == 1 ? move : MOVE_NONE);
-}
-
-
-/// line_to_san() takes a position and a line (an array of moves representing
-/// a sequence of legal moves from the position) as input, and returns a
-/// string containing the line in short algebraic notation.  If the boolean
-/// parameter 'breakLines' is true, line breaks are inserted, with a line
-/// length of 80 characters.  After a line break, 'startColumn' spaces are
-/// inserted at the beginning of the new line.
-
-const string line_to_san(const Position& pos, Move line[], int startColumn, bool breakLines) {
-
-  StateInfo st;
-  std::stringstream s;
-  string moveStr;
-  size_t length = 0;
-  size_t maxLength = 80 - startColumn;
-  Position p(pos, pos.thread());
-
-  for (Move* m = line; *m != MOVE_NONE; m++)
-  {
-      moveStr = move_to_san(p, *m);
-      length += moveStr.length() + 1;
-      if (breakLines && length > maxLength)
-      {
-          s << "\n" << std::setw(startColumn) << " ";
-          length = moveStr.length() + 1;
-      }
-      s << moveStr << ' ';
-
-      if (*m == MOVE_NULL)
-          p.do_null_move(st);
-      else
-          p.do_move(*m, st);
-  }
-  return s.str();
-}
-
-
-/// pretty_pv() creates a human-readable string from a position and a PV.
-/// It is used to write search information to the log file (which is created
-/// when the UCI parameter "Use Search Log" is "true").
-
-const string pretty_pv(const Position& pos, int time, int depth, uint64_t nodes,
-                       Value score, ValueType type, Move pv[]) {
-
-  const uint64_t K = 1000;
-  const uint64_t M = 1000000;
-
-  std::stringstream s;
-
-  // Depth
-  s << std::setw(2) << depth << "  ";
-
-  // Score
-  s << (type == VALUE_TYPE_LOWER ? ">" : type == VALUE_TYPE_UPPER ? "<" : " ")
-    << std::setw(7) << score_string(score);
-
-  // Time
-  s << std::setw(8) << time_string(time) << " ";
-
-  // Nodes
-  if (nodes < M)
-      s << std::setw(8) << nodes / 1 << " ";
-  else if (nodes < K * M)
-      s << std::setw(7) << nodes / K << "K ";
-  else
-      s << std::setw(7) << nodes / M << "M ";
-
-  // PV
-  s << line_to_san(pos, pv, 30, true);
-
-  return s.str();
-}
-
-
-namespace {
-
-  Ambiguity move_ambiguity(const Position& pos, Move m) {
-
-    Square from = move_from(m);
-    Square to = move_to(m);
-    Piece pc = pos.piece_on(from);
-
-    // King moves are never ambiguous, because there is never two kings of
-    // the same color.
-    if (type_of_piece(pc) == KING)
-        return AMBIGUITY_NONE;
-
-    MovePicker mp = MovePicker(pos, MOVE_NONE, OnePly, H);
-    Bitboard pinned = pos.pinned_pieces(pos.side_to_move());
-    Move mv, moveList[8];
-
-    int n = 0;
-    while ((mv = mp.get_next_move()) != MOVE_NONE)
-        if (move_to(mv) == to && pos.piece_on(move_from(mv)) == pc && pos.pl_move_is_legal(mv, pinned))
-            moveList[n++] = mv;
-
-    if (n == 1)
-        return AMBIGUITY_NONE;
-
-    int f = 0, r = 0;
-    for (int i = 0; i < n; i++)
-    {
-        if (square_file(move_from(moveList[i])) == square_file(from))
-            f++;
-
-        if (square_rank(move_from(moveList[i])) == square_rank(from))
-            r++;
-    }
-    if (f == 1)
-        return AMBIGUITY_FILE;
-
-    if (r == 1)
-        return AMBIGUITY_RANK;
-
-    return AMBIGUITY_BOTH;
-  }
-
-
-  const string time_string(int millisecs) {
-
-    const int MSecMinute = 1000 * 60;
-    const int MSecHour   = 1000 * 60 * 60;
-
-    std::stringstream s;
-    s << std::setfill('0');
-
-    int hours = millisecs / MSecHour;
-    int minutes = (millisecs - hours * MSecHour) / MSecMinute;
-    int seconds = (millisecs - hours * MSecHour - minutes * MSecMinute) / 1000;
-
-    if (hours)
-        s << hours << ':';
-
-    s << std::setw(2) << minutes << ':' << std::setw(2) << seconds;
-    return s.str();
-  }
-
-
-  const string score_string(Value v) {
-
-    std::stringstream s;
-
-    if (v >= VALUE_MATE - 200)
-        s << "#" << (VALUE_MATE - v + 1) / 2;
-    else if (v <= -VALUE_MATE + 200)
-        s << "-#" << (VALUE_MATE + v) / 2;
-    else
-    {
-        float floatScore = float(v) / float(PawnValueMidgame);
-        if (v >= 0)
-            s << '+';
-
-        s << std::setprecision(2) << std::fixed << floatScore;
-    }
-    return s.str();
-  }
-}

src/san.h

@@ -1,44 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(SAN_H_INCLUDED)
-#define SAN_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include <string>
-
-#include "move.h"
-#include "position.h"
-#include "value.h"
-
-
-////
-//// Prototypes
-////
-
-extern const std::string move_to_san(Position& pos, Move m);
-extern Move move_from_san(const Position& pos, const std::string& str);
-extern const std::string line_to_san(const Position& pos, Move line[], int startColumn, bool breakLines);
-extern const std::string pretty_pv(const Position& pos, int time, int depth, uint64_t nodes, Value score, ValueType type, Move pv[]);
-
-#endif // !defined(SAN_H_INCLUDED)

src/scale.h

@@ -1,52 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(SCALE_H_INCLUDED)
-#define SCALE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include "value.h"
-
-
-////
-//// Types
-////
-
-enum ScaleFactor {
-  SCALE_FACTOR_ZERO = 0,
-  SCALE_FACTOR_NORMAL = 64,
-  SCALE_FACTOR_MAX = 128,
-  SCALE_FACTOR_NONE = 255
-};
-
-
-////
-//// Inline functions
-////
-
-inline Value apply_scale_factor(Value v, ScaleFactor f) {
-  return Value((v * f) / int(SCALE_FACTOR_NORMAL));
-}
-
-
-#endif // !defined(SCALE_H_INCLUDED)

src/search.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,66 +17,66 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(SEARCH_H_INCLUDED)
 #define SEARCH_H_INCLUDED
 
-////
-//// Includes
-////
+#include <cstring>
+#include <vector>
 
-#include "depth.h"
-#include "move.h"
-#include "value.h"
+#include "types.h"
 
+class Position;
+struct SplitPoint;
 
-////
-//// Constants
-////
+namespace Search {
 
-const int PLY_MAX = 100;
-const int PLY_MAX_PLUS_2 = 102;
-const int KILLER_MAX = 2;
+/// The Stack struct keeps track of the information we need to remember from
+/// nodes shallower and deeper in the tree during the search. Each search thread
+/// has its own array of Stack objects, indexed by the current ply.
 
-
-////
-//// Types
-////
-
-/// The SearchStack struct keeps track of the information we need to remember
-/// from nodes shallower and deeper in the tree during the search.  Each
-/// search thread has its own array of SearchStack objects, indexed by the
-/// current ply.
-struct EvalInfo;
-
-struct SearchStack {
+struct Stack {
+  SplitPoint* sp;
+  int ply;
   Move currentMove;
-  Move mateKiller;
-  Move threatMove;
   Move excludedMove;
   Move bestMove;
-  Move killers[KILLER_MAX];
+  Move killers[2];
   Depth reduction;
   Value eval;
-  bool skipNullMove;
-
-  void init();
-  void initKillers();
+  Value evalMargin;
+  int skipNullMove;
 };
 
 
-////
-//// Prototypes
-////
+/// The LimitsType struct stores information sent by GUI about available time
+/// to search the current move, maximum depth/time, if we are in analysis mode
+/// or if we have to ponder while is our opponent's side to move.
 
-extern void init_search();
-extern void init_threads();
-extern void exit_threads();
-extern bool think(const Position &pos, bool infinite, bool ponder, int side_to_move,
-                  int time[], int increment[], int movesToGo, int maxDepth,
-                  int maxNodes, int maxTime, Move searchMoves[]);
-extern int perft(Position &pos, Depth depth);
-extern int64_t nodes_searched();
+struct LimitsType {
 
+  LimitsType() {  memset(this, 0, sizeof(LimitsType)); }
+  bool use_time_management() const { return !(maxTime | maxDepth | maxNodes | infinite); }
+
+  int time, increment, movesToGo, maxTime, maxDepth, maxNodes, infinite, ponder;
+};
+
+
+/// The SignalsType struct stores volatile flags updated during the search
+/// typically in an async fashion, for instance to stop the search by the GUI.
+
+struct SignalsType {
+  bool stopOnPonderhit, firstRootMove, stop, failedLowAtRoot;
+};
+
+extern volatile SignalsType Signals;
+extern LimitsType Limits;
+extern std::vector<Move> SearchMoves;
+extern Position RootPosition;
+
+extern void init();
+extern int64_t perft(Position& pos, Depth depth);
+extern void think();
+
+} // namespace
 
 #endif // !defined(SEARCH_H_INCLUDED)

src/square.h

@@ -1,201 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(SQUARE_H_INCLUDED)
-#define SQUARE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include <cstdlib> // for abs()
-#include <string>
-
-#include "color.h"
-#include "misc.h"
-
-
-////
-//// Types
-////
-
-enum Square {
-  SQ_A1, SQ_B1, SQ_C1, SQ_D1, SQ_E1, SQ_F1, SQ_G1, SQ_H1,
-  SQ_A2, SQ_B2, SQ_C2, SQ_D2, SQ_E2, SQ_F2, SQ_G2, SQ_H2,
-  SQ_A3, SQ_B3, SQ_C3, SQ_D3, SQ_E3, SQ_F3, SQ_G3, SQ_H3,
-  SQ_A4, SQ_B4, SQ_C4, SQ_D4, SQ_E4, SQ_F4, SQ_G4, SQ_H4,
-  SQ_A5, SQ_B5, SQ_C5, SQ_D5, SQ_E5, SQ_F5, SQ_G5, SQ_H5,
-  SQ_A6, SQ_B6, SQ_C6, SQ_D6, SQ_E6, SQ_F6, SQ_G6, SQ_H6,
-  SQ_A7, SQ_B7, SQ_C7, SQ_D7, SQ_E7, SQ_F7, SQ_G7, SQ_H7,
-  SQ_A8, SQ_B8, SQ_C8, SQ_D8, SQ_E8, SQ_F8, SQ_G8, SQ_H8,
-  SQ_NONE
-};
-
-enum File {
-  FILE_A, FILE_B, FILE_C, FILE_D, FILE_E, FILE_F, FILE_G, FILE_H, FILE_NONE
-};
-
-enum Rank {
-  RANK_1, RANK_2, RANK_3, RANK_4, RANK_5, RANK_6, RANK_7, RANK_8, RANK_NONE
-};
-
-enum SquareDelta {
-  DELTA_SSW = -021, DELTA_SS = -020, DELTA_SSE = -017, DELTA_SWW = -012,
-  DELTA_SW = -011, DELTA_S = -010, DELTA_SE = -07, DELTA_SEE = -06,
-  DELTA_W = -01, DELTA_ZERO = 0, DELTA_E = 01, DELTA_NWW = 06, DELTA_NW = 07,
-  DELTA_N = 010, DELTA_NE = 011, DELTA_NEE = 012, DELTA_NNW = 017,
-  DELTA_NN = 020, DELTA_NNE = 021
-};
-
-
-////
-//// Constants
-////
-
-const int FlipMask = 070;
-const int FlopMask = 07;
-
-
-////
-//// Inline functions
-////
-
-inline File operator+ (File x, int i) { return File(int(x) + i); }
-inline File operator+ (File x, File y) { return x + int(y); }
-inline void operator++ (File &x, int) { x = File(int(x) + 1); }
-inline void operator+= (File &x, int i) { x = File(int(x) + i); }
-inline File operator- (File x, int i) { return File(int(x) - i); }
-inline void operator-- (File &x, int) { x = File(int(x) - 1); }
-inline void operator-= (File &x, int i) { x = File(int(x) - i); }
-
-inline Rank operator+ (Rank x, int i) { return Rank(int(x) + i); }
-inline Rank operator+ (Rank x, Rank y) { return x + int(y); }
-inline void operator++ (Rank &x, int) { x = Rank(int(x) + 1); }
-inline void operator+= (Rank &x, int i) { x = Rank(int(x) + i); }
-inline Rank operator- (Rank x, int i) { return Rank(int(x) - i); }
-inline void operator-- (Rank &x, int) { x = Rank(int(x) - 1); }
-inline void operator-= (Rank &x, int i) { x = Rank(int(x) - i); }
-
-inline Square operator+ (Square x, int i) { return Square(int(x) + i); }
-inline void operator++ (Square &x, int) { x = Square(int(x) + 1); }
-inline void operator+= (Square &x, int i) { x = Square(int(x) + i); }
-inline Square operator- (Square x, int i) { return Square(int(x) - i); }
-inline void operator-- (Square &x, int) { x = Square(int(x) - 1); }
-inline void operator-= (Square &x, int i) { x = Square(int(x) - i); }
-inline Square operator+ (Square x, SquareDelta i) { return Square(int(x) + i); }
-inline void operator+= (Square &x, SquareDelta i) { x = Square(int(x) + i); }
-inline Square operator- (Square x, SquareDelta i) { return Square(int(x) - i); }
-inline void operator-= (Square &x, SquareDelta i) { x = Square(int(x) - i); }
-inline SquareDelta operator- (Square x, Square y) {
-  return SquareDelta(int(x) - int(y));
-}
-
-inline Square make_square(File f, Rank r) {
-  return Square(int(f) | (int(r) << 3));
-}
-
-inline File square_file(Square s) {
-  return File(int(s) & 7);
-}
-
-inline Rank square_rank(Square s) {
-  return Rank(int(s) >> 3);
-}
-
-inline Square flip_square(Square s) {
-  return Square(int(s) ^ FlipMask);
-}
-
-inline Square flop_square(Square s) {
-  return Square(int(s) ^ FlopMask);
-}
-
-inline Square relative_square(Color c, Square s) {
-  return Square(int(s) ^ (int(c) * FlipMask));
-}
-
-inline Rank relative_rank(Color c, Square s) {
-  return square_rank(relative_square(c, s));
-}
-
-inline Color square_color(Square s) {
-  return Color((int(square_file(s)) + int(square_rank(s))) & 1);
-}
-
-inline int file_distance(File f1, File f2) {
-  return abs(int(f1) - int(f2));
-}
-
-inline int file_distance(Square s1, Square s2) {
-  return file_distance(square_file(s1), square_file(s2));
-}
-
-inline int rank_distance(Rank r1, Rank r2) {
-  return abs(int(r1) - int(r2));
-}
-
-inline int rank_distance(Square s1, Square s2) {
-  return rank_distance(square_rank(s1), square_rank(s2));
-}
-
-inline int square_distance(Square s1, Square s2) {
-  return Max(file_distance(s1, s2), rank_distance(s1, s2));
-}
-
-inline File file_from_char(char c) {
-  return File(c - 'a') + FILE_A;
-}
-
-inline char file_to_char(File f) {
-  return char(f - FILE_A + int('a'));
-}
-
-inline Rank rank_from_char(char c) {
-  return Rank(c - '1') + RANK_1;
-}
-
-inline char rank_to_char(Rank r) {
-  return char(r - RANK_1 + int('1'));
-}
-
-inline Square square_from_string(const std::string& str) {
-  return make_square(file_from_char(str[0]), rank_from_char(str[1]));
-}
-
-inline const std::string square_to_string(Square s) {
-  std::string str;
-  str += file_to_char(square_file(s));
-  str += rank_to_char(square_rank(s));
-  return str;
-}
-
-inline bool file_is_ok(File f) {
-  return f >= FILE_A && f <= FILE_H;
-}
-
-inline bool rank_is_ok(Rank r) {
-  return r >= RANK_1 && r <= RANK_8;
-}
-
-inline bool square_is_ok(Square s) {
-  return file_is_ok(square_file(s)) && rank_is_ok(square_rank(s));
-}
-
-#endif // !defined(SQUARE_H_INCLUDED)

src/thread.cpp

@@ -0,0 +1,502 @@
+/*
+  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+
+  Stockfish is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Stockfish is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <iostream>
+
+#include "search.h"
+#include "thread.h"
+#include "ucioption.h"
+
+using namespace Search;
+
+ThreadsManager Threads; // Global object
+
+namespace { extern "C" {
+
+ // start_routine() is the C function which is called when a new thread
+ // is launched. It simply calls idle_loop() of the supplied thread. The first
+ // and last thread are special. First one is the main search thread while the
+ // last one mimics a timer, they run in main_loop() and timer_loop().
+
+#if defined(_MSC_VER)
+  DWORD WINAPI start_routine(LPVOID thread) {
+#else
+  void* start_routine(void* thread) {
+#endif
+
+    Thread* th = (Thread*)thread;
+
+    if (th->threadID == 0)
+        th->main_loop();
+
+    else if (th->threadID == MAX_THREADS)
+        th->timer_loop();
+
+    else
+        th->idle_loop(NULL);
+
+    return 0;
+  }
+
+} }
+
+
+// wake_up() wakes up the thread, normally at the beginning of the search or,
+// if "sleeping threads" is used, when there is some work to do.
+
+void Thread::wake_up() {
+
+  lock_grab(&sleepLock);
+  cond_signal(&sleepCond);
+  lock_release(&sleepLock);
+}
+
+
+// cutoff_occurred() checks whether a beta cutoff has occurred in the current
+// active split point, or in some ancestor of the split point.
+
+bool Thread::cutoff_occurred() const {
+
+  for (SplitPoint* sp = splitPoint; sp; sp = sp->parent)
+      if (sp->is_betaCutoff)
+          return true;
+
+  return false;
+}
+
+
+// is_available_to() checks whether the thread is available to help the thread with
+// threadID "master" at a split point. An obvious requirement is that thread must be
+// idle. With more than two threads, this is not by itself sufficient: If the thread
+// is the master of some active split point, it is only available as a slave to the
+// threads which are busy searching the split point at the top of "slave"'s split
+// point stack (the "helpful master concept" in YBWC terminology).
+
+bool Thread::is_available_to(int master) const {
+
+  if (is_searching)
+      return false;
+
+  // Make a local copy to be sure doesn't become zero under our feet while
+  // testing next condition and so leading to an out of bound access.
+  int localActiveSplitPoints = activeSplitPoints;
+
+  // No active split points means that the thread is available as a slave for any
+  // other thread otherwise apply the "helpful master" concept if possible.
+  if (   !localActiveSplitPoints
+      || splitPoints[localActiveSplitPoints - 1].is_slave[master])
+      return true;
+
+  return false;
+}
+
+
+// read_uci_options() updates number of active threads and other parameters
+// according to the UCI options values. It is called before to start a new search.
+
+void ThreadsManager::read_uci_options() {
+
+  maxThreadsPerSplitPoint = Options["Max Threads per Split Point"];
+  minimumSplitDepth       = Options["Min Split Depth"] * ONE_PLY;
+  useSleepingThreads      = Options["Use Sleeping Threads"];
+
+  set_size(Options["Threads"]);
+}
+
+
+// set_size() changes the number of active threads and raises do_sleep flag for
+// all the unused threads that will go immediately to sleep.
+
+void ThreadsManager::set_size(int cnt) {
+
+  assert(cnt > 0 && cnt <= MAX_THREADS);
+
+  activeThreads = cnt;
+
+  for (int i = 1; i < MAX_THREADS; i++) // Ignore main thread
+      if (i < activeThreads)
+      {
+          // Dynamically allocate pawn and material hash tables according to the
+          // number of active threads. This avoids preallocating memory for all
+          // possible threads if only few are used.
+          threads[i].pawnTable.init();
+          threads[i].materialTable.init();
+
+          threads[i].do_sleep = false;
+      }
+      else
+          threads[i].do_sleep = true;
+}
+
+
+// init() is called during startup. Initializes locks and condition variables
+// and launches all threads sending them immediately to sleep.
+
+void ThreadsManager::init() {
+
+  // Initialize sleep condition and lock used by thread manager
+  cond_init(&sleepCond);
+  lock_init(&threadsLock);
+
+  // Initialize thread's sleep conditions and split point locks
+  for (int i = 0; i <= MAX_THREADS; i++)
+  {
+      lock_init(&threads[i].sleepLock);
+      cond_init(&threads[i].sleepCond);
+
+      for (int j = 0; j < MAX_ACTIVE_SPLIT_POINTS; j++)
+          lock_init(&(threads[i].splitPoints[j].lock));
+  }
+
+  // Allocate main thread tables to call evaluate() also when not searching
+  threads[0].pawnTable.init();
+  threads[0].materialTable.init();
+
+  // Create and launch all the threads, threads will go immediately to sleep
+  for (int i = 0; i <= MAX_THREADS; i++)
+  {
+      threads[i].is_searching = false;
+      threads[i].do_sleep = (i != 0); // Avoid a race with start_thinking()
+      threads[i].threadID = i;
+
+#if defined(_MSC_VER)
+      threads[i].handle = CreateThread(NULL, 0, start_routine, &threads[i], 0, NULL);
+      bool ok = (threads[i].handle != NULL);
+#else
+      bool ok = !pthread_create(&threads[i].handle, NULL, start_routine, &threads[i]);
+#endif
+
+      if (!ok)
+      {
+          std::cerr << "Failed to create thread number " << i << std::endl;
+          ::exit(EXIT_FAILURE);
+      }
+  }
+}
+
+
+// exit() is called to cleanly terminate the threads when the program finishes
+
+void ThreadsManager::exit() {
+
+  for (int i = 0; i <= MAX_THREADS; i++)
+  {
+      threads[i].do_terminate = true; // Search must be already finished
+      threads[i].wake_up();
+
+      // Wait for thread termination
+#if defined(_MSC_VER)
+      WaitForSingleObject(threads[i].handle, INFINITE);
+      CloseHandle(threads[i].handle);
+#else
+      pthread_join(threads[i].handle, NULL);
+#endif
+
+      // Now we can safely destroy associated locks and wait conditions
+      lock_destroy(&threads[i].sleepLock);
+      cond_destroy(&threads[i].sleepCond);
+
+      for (int j = 0; j < MAX_ACTIVE_SPLIT_POINTS; j++)
+          lock_destroy(&(threads[i].splitPoints[j].lock));
+  }
+
+  lock_destroy(&threadsLock);
+  cond_destroy(&sleepCond);
+}
+
+
+// available_slave_exists() tries to find an idle thread which is available as
+// a slave for the thread with threadID 'master'.
+
+bool ThreadsManager::available_slave_exists(int master) const {
+
+  assert(master >= 0 && master < activeThreads);
+
+  for (int i = 0; i < activeThreads; i++)
+      if (threads[i].is_available_to(master))
+          return true;
+
+  return false;
+}
+
+
+// split_point_finished() checks if all the slave threads of a given split
+// point have finished searching.
+
+bool ThreadsManager::split_point_finished(SplitPoint* sp) const {
+
+  for (int i = 0; i < activeThreads; i++)
+      if (sp->is_slave[i])
+          return false;
+
+  return true;
+}
+
+
+// split() does the actual work of distributing the work at a node between
+// several available threads. If it does not succeed in splitting the node
+// (because no idle threads are available, or because we have no unused split
+// point objects), the function immediately returns. If splitting is possible, a
+// SplitPoint object is initialized with all the data that must be copied to the
+// helper threads and then helper threads are told that they have been assigned
+// work. This will cause them to instantly leave their idle loops and call
+// search(). When all threads have returned from search() then split() returns.
+
+template <bool Fake>
+Value ThreadsManager::split(Position& pos, Stack* ss, Value alpha, Value beta,
+                            Value bestValue, Depth depth, Move threatMove,
+                            int moveCount, MovePicker* mp, int nodeType) {
+  assert(pos.pos_is_ok());
+  assert(bestValue > -VALUE_INFINITE);
+  assert(bestValue <= alpha);
+  assert(alpha < beta);
+  assert(beta <= VALUE_INFINITE);
+  assert(depth > DEPTH_ZERO);
+  assert(pos.thread() >= 0 && pos.thread() < activeThreads);
+  assert(activeThreads > 1);
+
+  int i, master = pos.thread();
+  Thread& masterThread = threads[master];
+
+  // If we already have too many active split points, don't split
+  if (masterThread.activeSplitPoints >= MAX_ACTIVE_SPLIT_POINTS)
+      return bestValue;
+
+  // Pick the next available split point from the split point stack
+  SplitPoint* sp = &masterThread.splitPoints[masterThread.activeSplitPoints];
+
+  // Initialize the split point
+  sp->parent = masterThread.splitPoint;
+  sp->master = master;
+  sp->is_betaCutoff = false;
+  sp->depth = depth;
+  sp->threatMove = threatMove;
+  sp->alpha = alpha;
+  sp->beta = beta;
+  sp->nodeType = nodeType;
+  sp->bestValue = bestValue;
+  sp->mp = mp;
+  sp->moveCount = moveCount;
+  sp->pos = &pos;
+  sp->nodes = 0;
+  sp->ss = ss;
+
+  for (i = 0; i < activeThreads; i++)
+      sp->is_slave[i] = false;
+
+  // If we are here it means we are not available
+  assert(masterThread.is_searching);
+
+  int workersCnt = 1; // At least the master is included
+
+  // Try to allocate available threads and ask them to start searching setting
+  // is_searching flag. This must be done under lock protection to avoid concurrent
+  // allocation of the same slave by another master.
+  lock_grab(&threadsLock);
+
+  for (i = 0; !Fake && i < activeThreads && workersCnt < maxThreadsPerSplitPoint; i++)
+      if (threads[i].is_available_to(master))
+      {
+          workersCnt++;
+          sp->is_slave[i] = true;
+          threads[i].splitPoint = sp;
+
+          // This makes the slave to exit from idle_loop()
+          threads[i].is_searching = true;
+
+          if (useSleepingThreads)
+              threads[i].wake_up();
+      }
+
+  lock_release(&threadsLock);
+
+  // We failed to allocate even one slave, return
+  if (!Fake && workersCnt == 1)
+      return bestValue;
+
+  masterThread.splitPoint = sp;
+  masterThread.activeSplitPoints++;
+
+  // Everything is set up. The master thread enters the idle loop, from which
+  // it will instantly launch a search, because its is_searching flag is set.
+  // We pass the split point as a parameter to the idle loop, which means that
+  // the thread will return from the idle loop when all slaves have finished
+  // their work at this split point.
+  masterThread.idle_loop(sp);
+
+  // In helpful master concept a master can help only a sub-tree of its split
+  // point, and because here is all finished is not possible master is booked.
+  assert(!masterThread.is_searching);
+
+  // We have returned from the idle loop, which means that all threads are
+  // finished. Note that changing state and decreasing activeSplitPoints is done
+  // under lock protection to avoid a race with Thread::is_available_to().
+  lock_grab(&threadsLock);
+
+  masterThread.is_searching = true;
+  masterThread.activeSplitPoints--;
+
+  lock_release(&threadsLock);
+
+  masterThread.splitPoint = sp->parent;
+  pos.set_nodes_searched(pos.nodes_searched() + sp->nodes);
+
+  return sp->bestValue;
+}
+
+// Explicit template instantiations
+template Value ThreadsManager::split<false>(Position&, Stack*, Value, Value, Value, Depth, Move, int, MovePicker*, int);
+template Value ThreadsManager::split<true>(Position&, Stack*, Value, Value, Value, Depth, Move, int, MovePicker*, int);
+
+
+// Thread::timer_loop() is where the timer thread waits maxPly milliseconds and
+// then calls do_timer_event(). If maxPly is 0 thread sleeps until is woken up.
+extern void check_time();
+
+void Thread::timer_loop() {
+
+  while (!do_terminate)
+  {
+      lock_grab(&sleepLock);
+      timed_wait(&sleepCond, &sleepLock, maxPly ? maxPly : INT_MAX);
+      lock_release(&sleepLock);
+      check_time();
+  }
+}
+
+
+// ThreadsManager::set_timer() is used to set the timer to trigger after msec
+// milliseconds. If msec is 0 then timer is stopped.
+
+void ThreadsManager::set_timer(int msec) {
+
+  Thread& timer = threads[MAX_THREADS];
+
+  lock_grab(&timer.sleepLock);
+  timer.maxPly = msec;
+  cond_signal(&timer.sleepCond); // Wake up and restart the timer
+  lock_release(&timer.sleepLock);
+}
+
+
+// Thread::main_loop() is where the main thread is parked waiting to be started
+// when there is a new search. Main thread will launch all the slave threads.
+
+void Thread::main_loop() {
+
+  while (true)
+  {
+      lock_grab(&sleepLock);
+
+      do_sleep = true; // Always return to sleep after a search
+      is_searching = false;
+
+      while (do_sleep && !do_terminate)
+      {
+          cond_signal(&Threads.sleepCond); // Wake up UI thread if needed
+          cond_wait(&sleepCond, &sleepLock);
+      }
+
+      is_searching = true;
+
+      lock_release(&sleepLock);
+
+      if (do_terminate)
+          return;
+
+      think(); // This is the search entry point
+  }
+}
+
+
+// ThreadsManager::start_thinking() is used by UI thread to wake up the main
+// thread parked in main_loop() and starting a new search. If asyncMode is true
+// then function returns immediately, otherwise caller is blocked waiting for
+// the search to finish.
+
+void ThreadsManager::start_thinking(const Position& pos, const LimitsType& limits,
+                                    const std::vector<Move>& searchMoves, bool asyncMode) {
+  Thread& main = threads[0];
+
+  lock_grab(&main.sleepLock);
+
+  // Wait main thread has finished before to launch a new search
+  while (!main.do_sleep)
+      cond_wait(&sleepCond, &main.sleepLock);
+
+  // Copy input arguments to initialize the search
+  RootPosition.copy(pos, 0);
+  Limits = limits;
+  SearchMoves = searchMoves;
+
+  // Reset signals before to start the new search
+  memset((void*)&Signals, 0, sizeof(Signals));
+
+  main.do_sleep = false;
+  cond_signal(&main.sleepCond); // Wake up main thread and start searching
+
+  if (!asyncMode)
+      while (!main.do_sleep)
+          cond_wait(&sleepCond, &main.sleepLock);
+
+  lock_release(&main.sleepLock);
+}
+
+
+// ThreadsManager::stop_thinking() is used by UI thread to raise a stop request
+// and to wait for the main thread finishing the search. Needed to wait exiting
+// and terminate the threads after a 'quit' command.
+
+void ThreadsManager::stop_thinking() {
+
+  Thread& main = threads[0];
+
+  Search::Signals.stop = true;
+
+  lock_grab(&main.sleepLock);
+
+  cond_signal(&main.sleepCond); // In case is waiting for stop or ponderhit
+
+  while (!main.do_sleep)
+      cond_wait(&sleepCond, &main.sleepLock);
+
+  lock_release(&main.sleepLock);
+}
+
+
+// ThreadsManager::wait_for_stop_or_ponderhit() is called when the maximum depth
+// is reached while the program is pondering. The point is to work around a wrinkle
+// in the UCI protocol: When pondering, the engine is not allowed to give a
+// "bestmove" before the GUI sends it a "stop" or "ponderhit" command. We simply
+// wait here until one of these commands (that raise StopRequest) is sent and
+// then return, after which the bestmove and pondermove will be printed.
+
+void ThreadsManager::wait_for_stop_or_ponderhit() {
+
+  Signals.stopOnPonderhit = true;
+
+  Thread& main = threads[0];
+
+  lock_grab(&main.sleepLock);
+
+  while (!Signals.stop)
+      cond_wait(&main.sleepCond, &main.sleepLock);
+
+  lock_release(&main.sleepLock);
+}

src/thread.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,34 +17,20 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(THREAD_H_INCLUDED)
 #define THREAD_H_INCLUDED
 
-
-////
-//// Includes
-////
-
 #include <cstring>
 
 #include "lock.h"
+#include "material.h"
 #include "movepick.h"
+#include "pawns.h"
 #include "position.h"
 #include "search.h"
 
-
-////
-//// Constants and variables
-////
-
-const int MAX_THREADS = 8;
-const int ACTIVE_SPLIT_POINTS_MAX = 8;
-
-
-////
-//// Types
-////
+const int MAX_THREADS = 32;
+const int MAX_ACTIVE_SPLIT_POINTS = 8;
 
 struct SplitPoint {
 
@@ -52,44 +38,105 @@ struct SplitPoint {
   SplitPoint* parent;
   const Position* pos;
   Depth depth;
-  bool pvNode, mateThreat;
   Value beta;
+  int nodeType;
   int ply;
-  SearchStack sstack[MAX_THREADS][PLY_MAX_PLUS_2];
+  int master;
+  Move threatMove;
 
   // Const pointers to shared data
   MovePicker* mp;
-  SearchStack* parentSstack;
+  Search::Stack* ss;
 
   // Shared data
   Lock lock;
+  volatile int64_t nodes;
   volatile Value alpha;
   volatile Value bestValue;
   volatile int moveCount;
-  volatile bool stopRequest;
-  volatile int slaves[MAX_THREADS];
+  volatile bool is_betaCutoff;
+  volatile bool is_slave[MAX_THREADS];
 };
 
-// ThreadState type is used to represent thread's current state
 
-enum ThreadState
-{
-  THREAD_SEARCHING,     // thread is performing work
-  THREAD_AVAILABLE,     // thread is polling for work
-  THREAD_SLEEPING,      // we are not thinking, so thread is sleeping
-  THREAD_BOOKED,        // other thread (master) has booked us as a slave
-  THREAD_WORKISWAITING, // master has ordered us to start
-  THREAD_TERMINATED     // we are quitting and thread is terminated
-};
+/// Thread struct keeps together all the thread related stuff like locks, state
+/// and especially split points. We also use per-thread pawn and material hash
+/// tables so that once we get a pointer to an entry its life time is unlimited
+/// and we don't have to care about someone changing the entry under our feet.
 
 struct Thread {
+
+  void wake_up();
+  bool cutoff_occurred() const;
+  bool is_available_to(int master) const;
+  void idle_loop(SplitPoint* sp);
+  void main_loop();
+  void timer_loop();
+
+  SplitPoint splitPoints[MAX_ACTIVE_SPLIT_POINTS];
+  MaterialInfoTable materialTable;
+  PawnInfoTable pawnTable;
+  int threadID;
+  int maxPly;
+  Lock sleepLock;
+  WaitCondition sleepCond;
   SplitPoint* volatile splitPoint;
   volatile int activeSplitPoints;
-  uint64_t nodes;
-  uint64_t betaCutOffs[2];
-  volatile ThreadState state;
-  unsigned char pad[64]; // set some distance among local data for each thread
+  volatile bool is_searching;
+  volatile bool do_sleep;
+  volatile bool do_terminate;
+
+#if defined(_MSC_VER)
+  HANDLE handle;
+#else
+  pthread_t handle;
+#endif
 };
 
 
+/// ThreadsManager class handles all the threads related stuff like init, starting,
+/// parking and, the most important, launching a slave thread at a split point.
+/// All the access to shared thread data is done through this class.
+
+class ThreadsManager {
+  /* As long as the single ThreadsManager object is defined as a global we don't
+     need to explicitly initialize to zero its data members because variables with
+     static storage duration are automatically set to zero before enter main()
+  */
+public:
+  Thread& operator[](int threadID) { return threads[threadID]; }
+  void init();
+  void exit();
+
+  bool use_sleeping_threads() const { return useSleepingThreads; }
+  int min_split_depth() const { return minimumSplitDepth; }
+  int size() const { return activeThreads; }
+
+  void set_size(int cnt);
+  void read_uci_options();
+  bool available_slave_exists(int master) const;
+  bool split_point_finished(SplitPoint* sp) const;
+  void set_timer(int msec);
+  void wait_for_stop_or_ponderhit();
+  void stop_thinking();
+  void start_thinking(const Position& pos, const Search::LimitsType& limits,
+                      const std::vector<Move>& searchMoves, bool asyncMode);
+
+  template <bool Fake>
+  Value split(Position& pos, Search::Stack* ss, Value alpha, Value beta, Value bestValue,
+              Depth depth, Move threatMove, int moveCount, MovePicker* mp, int nodeType);
+private:
+  friend struct Thread;
+
+  Thread threads[MAX_THREADS + 1]; // Last one is used as a timer
+  Lock threadsLock;
+  Depth minimumSplitDepth;
+  int maxThreadsPerSplitPoint;
+  int activeThreads;
+  bool useSleepingThreads;
+  WaitCondition sleepCond;
+};
+
+extern ThreadsManager Threads;
+
 #endif // !defined(THREAD_H_INCLUDED)

src/timeman.cpp

@@ -0,0 +1,162 @@
+/*
+  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
+  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+
+  Stockfish is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Stockfish is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <cmath>
+#include <algorithm>
+
+#include "misc.h"
+#include "search.h"
+#include "timeman.h"
+#include "ucioption.h"
+
+namespace {
+
+  /// Constants
+
+  const int MoveHorizon  = 50;    // Plan time management at most this many moves ahead
+  const float MaxRatio   = 3.0f;  // When in trouble, we can step over reserved time with this ratio
+  const float StealRatio = 0.33f; // However we must not steal time from remaining moves over this ratio
+
+
+  // MoveImportance[] is based on naive statistical analysis of "how many games are still undecided
+  // after n half-moves". Game is considered "undecided" as long as neither side has >275cp advantage.
+  // Data was extracted from CCRL game database with some simple filtering criteria.
+  const int MoveImportance[512] = {
+    7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780, 7780,
+    7780, 7780, 7780, 7780, 7778, 7778, 7776, 7776, 7776, 7773, 7770, 7768, 7766, 7763, 7757, 7751,
+    7743, 7735, 7724, 7713, 7696, 7689, 7670, 7656, 7627, 7605, 7571, 7549, 7522, 7493, 7462, 7425,
+    7385, 7350, 7308, 7272, 7230, 7180, 7139, 7094, 7055, 7010, 6959, 6902, 6841, 6778, 6705, 6651,
+    6569, 6508, 6435, 6378, 6323, 6253, 6152, 6085, 5995, 5931, 5859, 5794, 5717, 5646, 5544, 5462,
+    5364, 5282, 5172, 5078, 4988, 4901, 4831, 4764, 4688, 4609, 4536, 4443, 4365, 4293, 4225, 4155,
+    4085, 4005, 3927, 3844, 3765, 3693, 3634, 3560, 3479, 3404, 3331, 3268, 3207, 3146, 3077, 3011,
+    2947, 2894, 2828, 2776, 2727, 2676, 2626, 2589, 2538, 2490, 2442, 2394, 2345, 2302, 2243, 2192,
+    2156, 2115, 2078, 2043, 2004, 1967, 1922, 1893, 1845, 1809, 1772, 1736, 1702, 1674, 1640, 1605,
+    1566, 1536, 1509, 1479, 1452, 1423, 1388, 1362, 1332, 1304, 1289, 1266, 1250, 1228, 1206, 1180,
+    1160, 1134, 1118, 1100, 1080, 1068, 1051, 1034, 1012, 1001, 980, 960, 945, 934, 916, 900, 888,
+    878, 865, 852, 828, 807, 787, 770, 753, 744, 731, 722, 706, 700, 683, 676, 671, 664, 652, 641,
+    634, 627, 613, 604, 591, 582, 568, 560, 552, 540, 534, 529, 519, 509, 495, 484, 474, 467, 460,
+    450, 438, 427, 419, 410, 406, 399, 394, 387, 382, 377, 372, 366, 359, 353, 348, 343, 337, 333,
+    328, 321, 315, 309, 303, 298, 293, 287, 284, 281, 277, 273, 265, 261, 255, 251, 247, 241, 240,
+    235, 229, 218, 217, 213, 212, 208, 206, 197, 193, 191, 189, 185, 184, 180, 177, 172, 170, 170,
+    170, 166, 163, 159, 158, 156, 155, 151, 146, 141, 138, 136, 132, 130, 128, 125, 123, 122, 118,
+    118, 118, 117, 115, 114, 108, 107, 105, 105, 105, 102, 97, 97, 95, 94, 93, 91, 88, 86, 83, 80,
+    80, 79, 79, 79, 78, 76, 75, 72, 72, 71, 70, 68, 65, 63, 61, 61, 59, 59, 59, 58, 56, 55, 54, 54,
+    52, 49, 48, 48, 48, 48, 45, 45, 45, 44, 43, 41, 41, 41, 41, 40, 40, 38, 37, 36, 34, 34, 34, 33,
+    31, 29, 29, 29, 28, 28, 28, 28, 28, 28, 28, 27, 27, 27, 27, 27, 24, 24, 23, 23, 22, 21, 20, 20,
+    19, 19, 19, 19, 19, 18, 18, 18, 18, 17, 17, 17, 17, 17, 16, 16, 15, 15, 14, 14, 14, 12, 12, 11,
+    9, 9, 9, 9, 9, 9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8,
+    8, 8, 8, 8, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4,
+    4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2,
+    2, 1, 1, 1, 1, 1, 1, 1 };
+
+  int move_importance(int ply) { return MoveImportance[std::min(ply, 511)]; }
+
+
+  /// Function Prototypes
+
+  enum TimeType { OptimumTime, MaxTime };
+
+  template<TimeType>
+  int remaining(int myTime, int movesToGo, int fullMoveNumber);
+}
+
+
+void TimeManager::pv_instability(int curChanges, int prevChanges) {
+
+  unstablePVExtraTime =  curChanges  * (optimumSearchTime / 2)
+                       + prevChanges * (optimumSearchTime / 3);
+}
+
+
+void TimeManager::init(const Search::LimitsType& limits, int currentPly)
+{
+  /* We support four different kind of time controls:
+
+      increment == 0 && movesToGo == 0 means: x basetime  [sudden death!]
+      increment == 0 && movesToGo != 0 means: x moves in y minutes
+      increment >  0 && movesToGo == 0 means: x basetime + z increment
+      increment >  0 && movesToGo != 0 means: x moves in y minutes + z increment
+
+    Time management is adjusted by following UCI parameters:
+
+      emergencyMoveHorizon: Be prepared to always play at least this many moves
+      emergencyBaseTime   : Always attempt to keep at least this much time (in ms) at clock
+      emergencyMoveTime   : Plus attempt to keep at least this much time for each remaining emergency move
+      minThinkingTime     : No matter what, use at least this much thinking before doing the move
+  */
+
+  int hypMTG, hypMyTime, t1, t2;
+
+  // Read uci parameters
+  int emergencyMoveHorizon = Options["Emergency Move Horizon"];
+  int emergencyBaseTime    = Options["Emergency Base Time"];
+  int emergencyMoveTime    = Options["Emergency Move Time"];
+  int minThinkingTime      = Options["Minimum Thinking Time"];
+
+  // Initialize to maximum values but unstablePVExtraTime that is reset
+  unstablePVExtraTime = 0;
+  optimumSearchTime = maximumSearchTime = limits.time;
+
+  // We calculate optimum time usage for different hypothetic "moves to go"-values and choose the
+  // minimum of calculated search time values. Usually the greatest hypMTG gives the minimum values.
+  for (hypMTG = 1; hypMTG <= (limits.movesToGo ? std::min(limits.movesToGo, MoveHorizon) : MoveHorizon); hypMTG++)
+  {
+      // Calculate thinking time for hypothetic "moves to go"-value
+      hypMyTime =  limits.time
+                 + limits.increment * (hypMTG - 1)
+                 - emergencyBaseTime
+                 - emergencyMoveTime * std::min(hypMTG, emergencyMoveHorizon);
+
+      hypMyTime = std::max(hypMyTime, 0);
+
+      t1 = minThinkingTime + remaining<OptimumTime>(hypMyTime, hypMTG, currentPly);
+      t2 = minThinkingTime + remaining<MaxTime>(hypMyTime, hypMTG, currentPly);
+
+      optimumSearchTime = std::min(optimumSearchTime, t1);
+      maximumSearchTime = std::min(maximumSearchTime, t2);
+  }
+
+  if (Options["Ponder"])
+      optimumSearchTime += optimumSearchTime / 4;
+
+  // Make sure that maxSearchTime is not over absoluteMaxSearchTime
+  optimumSearchTime = std::min(optimumSearchTime, maximumSearchTime);
+}
+
+
+namespace {
+
+  template<TimeType T>
+  int remaining(int myTime, int movesToGo, int currentPly)
+  {
+    const float TMaxRatio   = (T == OptimumTime ? 1 : MaxRatio);
+    const float TStealRatio = (T == OptimumTime ? 0 : StealRatio);
+
+    int thisMoveImportance = move_importance(currentPly);
+    int otherMovesImportance = 0;
+
+    for (int i = 1; i < movesToGo; i++)
+        otherMovesImportance += move_importance(currentPly + 2 * i);
+
+    float ratio1 = (TMaxRatio * thisMoveImportance) / float(TMaxRatio * thisMoveImportance + otherMovesImportance);
+    float ratio2 = (thisMoveImportance + TStealRatio * otherMovesImportance) / float(thisMoveImportance + otherMovesImportance);
+
+    return int(floor(myTime * std::min(ratio1, ratio2)));
+  }
+}

src/timeman.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,23 +17,23 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
+#if !defined(TIMEMAN_H_INCLUDED)
+#define TIMEMAN_H_INCLUDED
 
-#if !defined(APPLICATION_H_INCLUDED)
-#define APPLICATION_H_INCLUDED
-
-
-/// Singleton class used to housekeep memory and global resources
-/// so to be sure we always leave in a clean state.
-
-class Application {
-
-  Application();
-  Application(const Application&);
+/// The TimeManager class computes the optimal time to think depending on the
+/// maximum available time, the move game number and other parameters.
 
+class TimeManager {
 public:
-  static void initialize();
-  static void free_resources();
-  static void exit_with_failure();
+  void init(const Search::LimitsType& limits, int currentPly);
+  void pv_instability(int curChanges, int prevChanges);
+  int available_time() const { return optimumSearchTime + unstablePVExtraTime; }
+  int maximum_time() const { return maximumSearchTime; }
+
+private:
+  int optimumSearchTime;
+  int maximumSearchTime;
+  int unstablePVExtraTime;
 };
 
-#endif // !defined(APPLICATION_H_INCLUDED)
+#endif // !defined(TIMEMAN_H_INCLUDED)

src/tt.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,30 +17,17 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
-#include <cassert>
-#include <cmath>
 #include <cstring>
+#include <iostream>
 
-#include "movegen.h"
 #include "tt.h"
 
-// The main transposition table
-TranspositionTable TT;
-
-////
-//// Functions
-////
+TranspositionTable TT; // Our global transposition table
 
 TranspositionTable::TranspositionTable() {
 
-  size = overwrites = 0;
-  entries = 0;
-  generation = 0;
+  size = generation = 0;
+  entries = NULL;
 }
 
 TranspositionTable::~TranspositionTable() {
@@ -49,38 +36,39 @@ TranspositionTable::~TranspositionTable() {
 }
 
 
-/// TranspositionTable::set_size sets the size of the transposition table,
+/// TranspositionTable::set_size() sets the size of the transposition table,
 /// measured in megabytes.
 
 void TranspositionTable::set_size(size_t mbSize) {
 
   size_t newSize = 1024;
 
-  // We store a cluster of ClusterSize number of TTEntry for each position
-  // and newSize is the maximum number of storable positions.
-  while ((2 * newSize) * sizeof(TTCluster) <= (mbSize << 20))
+  // Transposition table consists of clusters and each cluster consists
+  // of ClusterSize number of TTEntries. Each non-empty entry contains
+  // information of exactly one position and newSize is the number of
+  // clusters we are going to allocate.
+  while (2ULL * newSize * sizeof(TTCluster) <= (mbSize << 20))
       newSize *= 2;
 
-  if (newSize != size)
+  if (newSize == size)
+      return;
+
+  size = newSize;
+  delete [] entries;
+  entries = new (std::nothrow) TTCluster[size];
+  if (!entries)
   {
-      size = newSize;
-      delete [] entries;
-      entries = new TTCluster[size];
-      if (!entries)
-      {
-          std::cerr << "Failed to allocate " << mbSize
-                    << " MB for transposition table." << std::endl;
-          Application::exit_with_failure();
-      }
-      clear();
+      std::cerr << "Failed to allocate " << mbSize
+                << "MB for transposition table." << std::endl;
+      exit(EXIT_FAILURE);
   }
+  clear();
 }
 
 
-/// TranspositionTable::clear overwrites the entire transposition table
+/// TranspositionTable::clear() overwrites the entire transposition table
 /// with zeroes. It is called whenever the table is resized, or when the
 /// user asks the program to clear the table (from the UCI interface).
-/// Perhaps we should also clear it when the "ucinewgame" command is recieved?
 
 void TranspositionTable::clear() {
 
@@ -88,28 +76,27 @@ void TranspositionTable::clear() {
 }
 
 
-/// TranspositionTable::store writes a new entry containing a position,
-/// a value, a value type, a search depth, and a best move to the
-/// transposition table. Transposition table is organized in clusters of
-/// four TTEntry objects, and when a new entry is written, it replaces
-/// the least valuable of the four entries in a cluster. A TTEntry t1 is
-/// considered to be more valuable than a TTEntry t2 if t1 is from the
-/// current search and t2 is from a previous search, or if the depth of t1
-/// is bigger than the depth of t2. A TTEntry of type VALUE_TYPE_EVAL
-/// never replaces another entry for the same position.
+/// TranspositionTable::store() writes a new entry containing position key and
+/// valuable information of current position. The lowest order bits of position
+/// key are used to decide on which cluster the position will be placed.
+/// When a new entry is written and there are no empty entries available in cluster,
+/// it replaces the least valuable of entries. A TTEntry t1 is considered to be
+/// more valuable than a TTEntry t2 if t1 is from the current search and t2 is from
+/// a previous search, or if the depth of t1 is bigger than the depth of t2.
 
 void TranspositionTable::store(const Key posKey, Value v, ValueType t, Depth d, Move m, Value statV, Value kingD) {
 
   int c1, c2, c3;
   TTEntry *tte, *replace;
-  uint32_t posKey32 = posKey >> 32; // Use the high 32 bits as key
+  uint32_t posKey32 = posKey >> 32; // Use the high 32 bits as key inside the cluster
 
   tte = replace = first_entry(posKey);
+
   for (int i = 0; i < ClusterSize; i++, tte++)
   {
-      if (!tte->key() || tte->key() == posKey32) // empty or overwrite old
+      if (!tte->key() || tte->key() == posKey32) // Empty or overwrite old
       {
-          // Preserve any exsisting ttMove
+          // Preserve any existing ttMove
           if (m == MOVE_NONE)
               m = tte->move();
 
@@ -117,26 +104,23 @@ void TranspositionTable::store(const Key posKey, Value v, ValueType t, Depth d,
           return;
       }
 
-      if (i == 0)  // replace would be a no-op in this common case
-          continue;
-
+      // Implement replace strategy
       c1 = (replace->generation() == generation ?  2 : 0);
-      c2 = (tte->generation() == generation ? -2 : 0);
+      c2 = (tte->generation() == generation || tte->type() == VALUE_TYPE_EXACT ? -2 : 0);
       c3 = (tte->depth() < replace->depth() ?  1 : 0);
 
       if (c1 + c2 + c3 > 0)
           replace = tte;
   }
   replace->save(posKey32, v, t, d, m, generation, statV, kingD);
-  overwrites++;
 }
 
 
-/// TranspositionTable::retrieve looks up the current position in the
-/// transposition table. Returns a pointer to the TTEntry or NULL
-/// if position is not found.
+/// TranspositionTable::probe() looks up the current position in the
+/// transposition table. Returns a pointer to the TTEntry or NULL if
+/// position is not found.
 
-TTEntry* TranspositionTable::retrieve(const Key posKey) const {
+TTEntry* TranspositionTable::probe(const Key posKey) const {
 
   uint32_t posKey32 = posKey >> 32;
   TTEntry* tte = first_entry(posKey);
@@ -155,72 +139,5 @@ TTEntry* TranspositionTable::retrieve(const Key posKey) const {
 /// entries from the current search.
 
 void TranspositionTable::new_search() {
-
   generation++;
-  overwrites = 0;
-}
-
-
-/// TranspositionTable::insert_pv() is called at the end of a search
-/// iteration, and inserts the PV back into the PV. This makes sure
-/// the old PV moves are searched first, even if the old TT entries
-/// have been overwritten.
-
-void TranspositionTable::insert_pv(const Position& pos, Move pv[]) {
-
-  StateInfo st;
-  Position p(pos, pos.thread());
-
-  for (int i = 0; pv[i] != MOVE_NONE; i++)
-  {
-      TTEntry *tte = retrieve(p.get_key());
-      if (!tte || tte->move() != pv[i])
-          store(p.get_key(), VALUE_NONE, VALUE_TYPE_NONE, Depth(-127*OnePly), pv[i], VALUE_NONE, VALUE_NONE);
-      p.do_move(pv[i], st);
-  }
-}
-
-
-/// TranspositionTable::extract_pv() extends a PV by adding moves from the
-/// transposition table at the end. This should ensure that the PV is almost
-/// always at least two plies long, which is important, because otherwise we
-/// will often get single-move PVs when the search stops while failing high,
-/// and a single-move PV means that we don't have a ponder move.
-
-void TranspositionTable::extract_pv(const Position& pos, Move bestMove, Move pv[], const int PLY_MAX) {
-
-  const TTEntry* tte;
-  StateInfo st;
-  Position p(pos, pos.thread());
-  int ply = 0;
-
-  assert(bestMove != MOVE_NONE);
-
-  pv[ply] = bestMove;
-  p.do_move(pv[ply++], st);
-
-  // Extract moves from TT when possible. We try hard to always
-  // get a ponder move, that's the reason of ply < 2 conditions.
-  while (   (tte = retrieve(p.get_key())) != NULL
-         && tte->move() != MOVE_NONE
-         && (tte->type() == VALUE_TYPE_EXACT || ply < 2)
-         && move_is_legal(p, tte->move())
-         && (!p.is_draw() || ply < 2)
-         && ply < PLY_MAX)
-  {
-      pv[ply] = tte->move();
-      p.do_move(pv[ply++], st);
-  }
-  pv[ply] = MOVE_NONE;
-}
-
-
-/// TranspositionTable::full() returns the permill of all transposition table
-/// entries which have received at least one overwrite during the current search.
-/// It is used to display the "info hashfull ..." information in UCI.
-
-int TranspositionTable::full() const {
-
-  double N = double(size) * ClusterSize;
-  return int(1000 * (1 - exp(overwrites * log(1.0 - 1.0/N))));
 }

src/tt.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,125 +17,157 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(TT_H_INCLUDED)
 #define TT_H_INCLUDED
 
-////
-//// Includes
-////
+#include <iostream>
 
-#include "depth.h"
-#include "position.h"
-#include "value.h"
+#include "misc.h"
+#include "types.h"
 
 
-////
-//// Types
-////
-
-/// The TTEntry class is the class of transposition table entries
+/// The TTEntry is the class of transposition table entries
 ///
-/// A TTEntry needs 96 bits to be stored
+/// A TTEntry needs 128 bits to be stored
 ///
 /// bit  0-31: key
 /// bit 32-63: data
 /// bit 64-79: value
 /// bit 80-95: depth
+/// bit 96-111: static value
+/// bit 112-127: margin of static value
 ///
 /// the 32 bits of the data field are so defined
 ///
-/// bit  0-16: move
-/// bit 17-19: not used
-/// bit 20-22: value type
+/// bit  0-15: move
+/// bit 16-20: not used
+/// bit 21-22: value type
 /// bit 23-31: generation
 
 class TTEntry {
 
 public:
-  void save(uint32_t k, Value v, ValueType t, Depth d, Move m, int g, Value statV, Value kd) {
+  void save(uint32_t k, Value v, ValueType t, Depth d, Move m, int g, Value statV, Value statM) {
 
-      key32 = k;
-      data = (m & 0x1FFFF) | (t << 20) | (g << 23);
-      value16     = int16_t(v);
-      depth16     = int16_t(d);
-      staticValue = int16_t(statV);
-      kingDanger  = int16_t(kd);
+    key32        = (uint32_t)k;
+    move16       = (uint16_t)m;
+    valueType    = (uint8_t)t;
+    generation8  = (uint8_t)g;
+    value16      = (int16_t)v;
+    depth16      = (int16_t)d;
+    staticValue  = (int16_t)statV;
+    staticMargin = (int16_t)statM;
   }
+  void set_generation(int g) { generation8 = (uint8_t)g; }
 
-  uint32_t key() const { return key32; }
-  Depth depth() const { return Depth(depth16); }
-  Move move() const { return Move(data & 0x1FFFF); }
-  Value value() const { return Value(value16); }
-  ValueType type() const { return ValueType((data >> 20) & 7); }
-  int generation() const { return data >> 23; }
-  Value static_value() const { return Value(staticValue); }
-  Value king_danger() const { return Value(kingDanger); }
+  uint32_t key() const              { return key32; }
+  Depth depth() const               { return (Depth)depth16; }
+  Move move() const                 { return (Move)move16; }
+  Value value() const               { return (Value)value16; }
+  ValueType type() const            { return (ValueType)valueType; }
+  int generation() const            { return (int)generation8; }
+  Value static_value() const        { return (Value)staticValue; }
+  Value static_value_margin() const { return (Value)staticMargin; }
 
 private:
   uint32_t key32;
-  uint32_t data;
-  int16_t value16;
-  int16_t depth16;
-  int16_t staticValue;
-  int16_t kingDanger;
+  uint16_t move16;
+  uint8_t valueType, generation8;
+  int16_t value16, depth16, staticValue, staticMargin;
 };
 
 
-/// This is the number of TTEntry slots for each position
+/// This is the number of TTEntry slots for each cluster
 const int ClusterSize = 4;
 
-/// Each group of ClusterSize number of TTEntry form a TTCluster
-/// that is indexed by a single position key. TTCluster size must
-///  be not bigger then a cache line size, in case it is less then
-/// it should be padded to guarantee always aligned accesses.
+
+/// TTCluster consists of ClusterSize number of TTEntries. Size of TTCluster
+/// must not be bigger than a cache line size. In case it is less, it should
+/// be padded to guarantee always aligned accesses.
 
 struct TTCluster {
   TTEntry data[ClusterSize];
 };
 
 
-/// The transposition table class. This is basically just a huge array
-/// containing TTEntry objects, and a few methods for writing new entries
-/// and reading new ones.
+/// The transposition table class. This is basically just a huge array containing
+/// TTCluster objects, and a few methods for writing and reading entries.
 
 class TranspositionTable {
 
+  TranspositionTable(const TranspositionTable&);
+  TranspositionTable& operator=(const TranspositionTable&);
+
 public:
   TranspositionTable();
   ~TranspositionTable();
   void set_size(size_t mbSize);
   void clear();
   void store(const Key posKey, Value v, ValueType type, Depth d, Move m, Value statV, Value kingD);
-  TTEntry* retrieve(const Key posKey) const;
+  TTEntry* probe(const Key posKey) const;
   void new_search();
-  void insert_pv(const Position& pos, Move pv[]);
-  void extract_pv(const Position& pos, Move bestMove, Move pv[], const int PLY_MAX);
-  int full() const;
   TTEntry* first_entry(const Key posKey) const;
+  void refresh(const TTEntry* tte) const;
 
 private:
-  // Be sure 'overwrites' is at least one cache line away
-  // from read only variables.
-  unsigned char pad_before[64 - sizeof(unsigned)];
-  unsigned overwrites; // heavy SMP read/write access here
-  unsigned char pad_after[64];
-
   size_t size;
   TTCluster* entries;
-  uint8_t generation;
+  uint8_t generation; // Size must be not bigger then TTEntry::generation8
 };
 
 extern TranspositionTable TT;
 
 
-/// TranspositionTable::first_entry returns a pointer to the first
-/// entry of a cluster given a position. The low 32 bits of the key
-/// are used to get the index in the table.
+/// TranspositionTable::first_entry() returns a pointer to the first entry of
+/// a cluster given a position. The lowest order bits of the key are used to
+/// get the index of the cluster.
 
 inline TTEntry* TranspositionTable::first_entry(const Key posKey) const {
 
-  return entries[uint32_t(posKey) & (size - 1)].data;
+  return entries[((uint32_t)posKey) & (size - 1)].data;
 }
 
+
+/// TranspositionTable::refresh() updates the 'generation' value of the TTEntry
+/// to avoid aging. Normally called after a TT hit.
+
+inline void TranspositionTable::refresh(const TTEntry* tte) const {
+
+  const_cast<TTEntry*>(tte)->set_generation(generation);
+}
+
+
+/// A simple fixed size hash table used to store pawns and material
+/// configurations. It is basically just an array of Entry objects.
+/// Without cluster concept or overwrite policy.
+
+template<class Entry, int HashSize>
+struct SimpleHash {
+
+  typedef SimpleHash<Entry, HashSize> Base;
+
+  void init() {
+
+    if (entries)
+        return;
+
+    entries = new (std::nothrow) Entry[HashSize];
+    if (!entries)
+    {
+        std::cerr << "Failed to allocate " << HashSize * sizeof(Entry)
+                  << " bytes for hash table." << std::endl;
+        exit(EXIT_FAILURE);
+    }
+    memset(entries, 0, HashSize * sizeof(Entry));
+  }
+
+  virtual ~SimpleHash() { delete [] entries; }
+
+  Entry* probe(Key key) const { return entries + ((uint32_t)key & (HashSize - 1)); }
+  void prefetch(Key key) const { ::prefetch((char*)probe(key)); }
+
+protected:
+  Entry* entries;
+};
+
 #endif // !defined(TT_H_INCLUDED)

src/types.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,96 +17,496 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(TYPES_H_INCLUDED)
 #define TYPES_H_INCLUDED
 
-#if !defined(_MSC_VER)
+/// For Linux and OSX configuration is done automatically using Makefile. To get
+/// started type 'make help'.
+///
+/// For Windows, part of the configuration is detected automatically, but some
+/// switches need to be set manually:
+///
+/// -DNDEBUG      | Disable debugging mode. Use always.
+///
+/// -DNO_PREFETCH | Disable use of prefetch asm-instruction. A must if you want
+///               | the executable to run on some very old machines.
+///
+/// -DUSE_POPCNT  | Add runtime support for use of popcnt asm-instruction. Works
+///               | only in 64-bit mode. For compiling requires hardware with
+///               | popcnt support.
+///
+/// -DOLD_LOCKS   | Under Windows are used the fast Slim Reader/Writer (SRW)
+///               | Locks and Condition Variables: these are not supported by
+///               | Windows XP and older, to compile for those platforms you
+///               | should enable OLD_LOCKS.
 
-#include <inttypes.h>
+#include <climits>
+#include <cstdlib>
 
-#else
+#if defined(_MSC_VER)
 
-typedef __int8 int8_t;
-typedef unsigned __int8 uint8_t;
-typedef __int16 int16;
+// Disable some silly and noisy warning from MSVC compiler
+#pragma warning(disable: 4127) // Conditional expression is constant
+#pragma warning(disable: 4146) // Unary minus operator applied to unsigned type
+#pragma warning(disable: 4800) // Forcing value to bool 'true' or 'false'
+
+// MSVC does not support <inttypes.h>
+typedef   signed __int8    int8_t;
+typedef unsigned __int8   uint8_t;
+typedef   signed __int16  int16_t;
 typedef unsigned __int16 uint16_t;
-typedef __int32 int32_t;
+typedef   signed __int32  int32_t;
 typedef unsigned __int32 uint32_t;
-typedef __int64 int64_t;
+typedef   signed __int64  int64_t;
 typedef unsigned __int64 uint64_t;
 
-typedef __int16 int16_t;
-typedef __int64 int64_t;
+#else
+#  include <inttypes.h>
+#endif
 
-#endif // !defined(_MSC_VER)
+#if defined(_WIN64)
+#  include <intrin.h> // MSVC popcnt and bsfq instrinsics
+#  define IS_64BIT
+#  define USE_BSFQ
+#endif
+
+#if defined(USE_POPCNT) && defined(_MSC_VER) && defined(__INTEL_COMPILER)
+#  include <nmmintrin.h> // Intel header for _mm_popcnt_u64() intrinsic
+#endif
+
+#if defined(_MSC_VER) || defined(__INTEL_COMPILER)
+#  define CACHE_LINE_ALIGNMENT __declspec(align(64))
+#else
+#  define CACHE_LINE_ALIGNMENT  __attribute__ ((aligned(64)))
+#endif
+
+#if defined(_MSC_VER)
+#  define FORCE_INLINE  __forceinline
+#elif defined(__GNUC__)
+#  define FORCE_INLINE  inline __attribute__((always_inline))
+#else
+#  define FORCE_INLINE  inline
+#endif
+
+#if defined(USE_POPCNT)
+const bool HasPopCnt = true;
+#else
+const bool HasPopCnt = false;
+#endif
+
+#if defined(IS_64BIT)
+const bool Is64Bit = true;
+#else
+const bool Is64Bit = false;
+#endif
 
-// Hash keys
 typedef uint64_t Key;
-
-// Bitboard type
 typedef uint64_t Bitboard;
 
+const int MAX_MOVES      = 256;
+const int MAX_PLY        = 100;
+const int MAX_PLY_PLUS_2 = MAX_PLY + 2;
 
-////
-//// Configuration
-////
+const Bitboard FileABB = 0x0101010101010101ULL;
+const Bitboard FileBBB = FileABB << 1;
+const Bitboard FileCBB = FileABB << 2;
+const Bitboard FileDBB = FileABB << 3;
+const Bitboard FileEBB = FileABB << 4;
+const Bitboard FileFBB = FileABB << 5;
+const Bitboard FileGBB = FileABB << 6;
+const Bitboard FileHBB = FileABB << 7;
 
-//// For Linux and OSX configuration is done automatically using Makefile.
-//// To get started type "make help".
-////
-//// For windows part of the configuration is detected automatically, but
-//// some switches need to be set manually:
-////
-//// -DNDEBUG       | Disable debugging mode. Use always.
-////
-//// -DNO_PREFETCH  | Disable use of prefetch asm-instruction. A must if you want the
-////                | executable to run on some very old machines.
-////
-//// -DUSE_POPCNT   | Add runtime support for use of popcnt asm-instruction.
-////                | Works only in 64-bit mode. For compiling requires hardware
-////                | with popcnt support. Around 4% speed-up.
+const Bitboard Rank1BB = 0xFF;
+const Bitboard Rank2BB = Rank1BB << (8 * 1);
+const Bitboard Rank3BB = Rank1BB << (8 * 2);
+const Bitboard Rank4BB = Rank1BB << (8 * 3);
+const Bitboard Rank5BB = Rank1BB << (8 * 4);
+const Bitboard Rank6BB = Rank1BB << (8 * 5);
+const Bitboard Rank7BB = Rank1BB << (8 * 6);
+const Bitboard Rank8BB = Rank1BB << (8 * 7);
 
-// Automatic detection for 64-bit under Windows
-#if defined(_WIN64)
-#define IS_64BIT
-#endif
 
-// Automatic detection for use of bsfq asm-instruction under Windows.
-// Works only in 64-bit mode. Does not work with MSVC.
-#if defined(_WIN64) && defined(__INTEL_COMPILER)
-#define USE_BSFQ
-#endif
+/// A move needs 16 bits to be stored
+///
+/// bit  0- 5: destination square (from 0 to 63)
+/// bit  6-11: origin square (from 0 to 63)
+/// bit 12-13: promotion piece type - 2 (from KNIGHT-2 to QUEEN-2)
+/// bit 14-15: special move flag: promotion (1), en passant (2), castle (3)
+///
+/// Special cases are MOVE_NONE and MOVE_NULL. We can sneak these in because in
+/// any normal move destination square is always different from origin square
+/// while MOVE_NONE and MOVE_NULL have the same origin and destination square.
 
-// Cache line alignment specification
-#if defined(_MSC_VER) || defined(__INTEL_COMPILER)
-#define CACHE_LINE_ALIGNMENT __declspec(align(64))
-#else
-#define CACHE_LINE_ALIGNMENT  __attribute__ ((aligned(64)))
-#endif
+enum Move {
+  MOVE_NONE = 0,
+  MOVE_NULL = 65
+};
 
-// Define a __cpuid() function for gcc compilers, for Intel and MSVC
-// is already available as an intrinsic.
-#if defined(_MSC_VER)
-#include <intrin.h>
-#elif defined(__GNUC__) && (defined(__i386__) || defined(__x86_64__))
-inline void __cpuid(int CPUInfo[4], int InfoType)
-{
-  int* eax = CPUInfo + 0;
-  int* ebx = CPUInfo + 1;
-  int* ecx = CPUInfo + 2;
-  int* edx = CPUInfo + 3;
+struct MoveStack {
+  Move move;
+  int score;
+};
 
-  *eax = InfoType;
-  *ecx = 0;
-  __asm__("cpuid" : "=a" (*eax), "=b" (*ebx), "=c" (*ecx), "=d" (*edx)
-                  : "0" (*eax), "2" (*ecx));
+inline bool operator<(const MoveStack& f, const MoveStack& s) {
+  return f.score < s.score;
 }
+
+enum CastleRight {
+  CASTLES_NONE = 0,
+  WHITE_OO     = 1,
+  BLACK_OO     = 2,
+  WHITE_OOO    = 4,
+  BLACK_OOO    = 8,
+  ALL_CASTLES  = 15
+};
+
+enum ScaleFactor {
+  SCALE_FACTOR_DRAW   = 0,
+  SCALE_FACTOR_NORMAL = 64,
+  SCALE_FACTOR_MAX    = 128,
+  SCALE_FACTOR_NONE   = 255
+};
+
+enum ValueType {
+  VALUE_TYPE_NONE  = 0,
+  VALUE_TYPE_UPPER = 1,
+  VALUE_TYPE_LOWER = 2,
+  VALUE_TYPE_EXACT = VALUE_TYPE_UPPER | VALUE_TYPE_LOWER
+};
+
+enum Value {
+  VALUE_ZERO      = 0,
+  VALUE_DRAW      = 0,
+  VALUE_KNOWN_WIN = 15000,
+  VALUE_MATE      = 30000,
+  VALUE_INFINITE  = 30001,
+  VALUE_NONE      = 30002,
+
+  VALUE_MATE_IN_MAX_PLY  =  VALUE_MATE - MAX_PLY,
+  VALUE_MATED_IN_MAX_PLY = -VALUE_MATE + MAX_PLY,
+
+  VALUE_ENSURE_INTEGER_SIZE_P = INT_MAX,
+  VALUE_ENSURE_INTEGER_SIZE_N = INT_MIN
+};
+
+enum PieceType {
+  NO_PIECE_TYPE = 0,
+  PAWN = 1, KNIGHT = 2, BISHOP = 3, ROOK = 4, QUEEN = 5, KING = 6
+};
+
+enum Piece {
+  NO_PIECE = 16, // color_of(NO_PIECE) == NO_COLOR
+  W_PAWN = 1, W_KNIGHT =  2, W_BISHOP =  3, W_ROOK =  4, W_QUEEN =  5, W_KING =  6,
+  B_PAWN = 9, B_KNIGHT = 10, B_BISHOP = 11, B_ROOK = 12, B_QUEEN = 13, B_KING = 14
+};
+
+enum Color {
+  WHITE, BLACK, NO_COLOR
+};
+
+enum Depth {
+
+  ONE_PLY = 2,
+
+  DEPTH_ZERO          =  0 * ONE_PLY,
+  DEPTH_QS_CHECKS     = -1 * ONE_PLY,
+  DEPTH_QS_NO_CHECKS  = -2 * ONE_PLY,
+  DEPTH_QS_RECAPTURES = -4 * ONE_PLY,
+
+  DEPTH_NONE = -127 * ONE_PLY
+};
+
+enum Square {
+  SQ_A1, SQ_B1, SQ_C1, SQ_D1, SQ_E1, SQ_F1, SQ_G1, SQ_H1,
+  SQ_A2, SQ_B2, SQ_C2, SQ_D2, SQ_E2, SQ_F2, SQ_G2, SQ_H2,
+  SQ_A3, SQ_B3, SQ_C3, SQ_D3, SQ_E3, SQ_F3, SQ_G3, SQ_H3,
+  SQ_A4, SQ_B4, SQ_C4, SQ_D4, SQ_E4, SQ_F4, SQ_G4, SQ_H4,
+  SQ_A5, SQ_B5, SQ_C5, SQ_D5, SQ_E5, SQ_F5, SQ_G5, SQ_H5,
+  SQ_A6, SQ_B6, SQ_C6, SQ_D6, SQ_E6, SQ_F6, SQ_G6, SQ_H6,
+  SQ_A7, SQ_B7, SQ_C7, SQ_D7, SQ_E7, SQ_F7, SQ_G7, SQ_H7,
+  SQ_A8, SQ_B8, SQ_C8, SQ_D8, SQ_E8, SQ_F8, SQ_G8, SQ_H8,
+  SQ_NONE,
+
+  DELTA_N =  8,
+  DELTA_E =  1,
+  DELTA_S = -8,
+  DELTA_W = -1,
+
+  DELTA_NN = DELTA_N + DELTA_N,
+  DELTA_NE = DELTA_N + DELTA_E,
+  DELTA_SE = DELTA_S + DELTA_E,
+  DELTA_SS = DELTA_S + DELTA_S,
+  DELTA_SW = DELTA_S + DELTA_W,
+  DELTA_NW = DELTA_N + DELTA_W
+};
+
+enum File {
+  FILE_A, FILE_B, FILE_C, FILE_D, FILE_E, FILE_F, FILE_G, FILE_H
+};
+
+enum Rank {
+  RANK_1, RANK_2, RANK_3, RANK_4, RANK_5, RANK_6, RANK_7, RANK_8
+};
+
+
+/// Score enum keeps a midgame and an endgame value in a single integer (enum),
+/// first LSB 16 bits are used to store endgame value, while upper bits are used
+/// for midgame value. Compiler is free to choose the enum type as long as can
+/// keep its data, so ensure Score to be an integer type.
+enum Score {
+  SCORE_ZERO = 0,
+  SCORE_ENSURE_INTEGER_SIZE_P = INT_MAX,
+  SCORE_ENSURE_INTEGER_SIZE_N = INT_MIN
+};
+
+inline Score make_score(int mg, int eg) { return Score((mg << 16) + eg); }
+
+/// Extracting the signed lower and upper 16 bits it not so trivial because
+/// according to the standard a simple cast to short is implementation defined
+/// and so is a right shift of a signed integer.
+inline Value mg_value(Score s) { return Value(((s + 32768) & ~0xffff) / 0x10000); }
+
+/// On Intel 64 bit we have a small speed regression with the standard conforming
+/// version, so use a faster code in this case that, although not 100% standard
+/// compliant it seems to work for Intel and MSVC.
+#if defined(IS_64BIT) && (!defined(__GNUC__) || defined(__INTEL_COMPILER))
+
+inline Value eg_value(Score s) { return Value(int16_t(s & 0xffff)); }
+
 #else
-inline void __cpuid(int CPUInfo[4], int)
-{
-   CPUInfo[0] = CPUInfo[1] = CPUInfo[2] = CPUInfo[3] = 0;
+
+inline Value eg_value(Score s) {
+  return Value((int)(unsigned(s) & 0x7fffu) - (int)(unsigned(s) & 0x8000u));
 }
+
 #endif
 
+#define ENABLE_SAFE_OPERATORS_ON(T)                                         \
+inline T operator+(const T d1, const T d2) { return T(int(d1) + int(d2)); } \
+inline T operator-(const T d1, const T d2) { return T(int(d1) - int(d2)); } \
+inline T operator*(int i, const T d) { return T(i * int(d)); }              \
+inline T operator*(const T d, int i) { return T(int(d) * i); }              \
+inline T operator-(const T d) { return T(-int(d)); }                        \
+inline T& operator+=(T& d1, const T d2) { d1 = d1 + d2; return d1; }        \
+inline T& operator-=(T& d1, const T d2) { d1 = d1 - d2; return d1; }        \
+inline T& operator*=(T& d, int i) { d = T(int(d) * i); return d; }
+
+#define ENABLE_OPERATORS_ON(T) ENABLE_SAFE_OPERATORS_ON(T)                  \
+inline T operator++(T& d, int) { d = T(int(d) + 1); return d; }             \
+inline T operator--(T& d, int) { d = T(int(d) - 1); return d; }             \
+inline T operator/(const T d, int i) { return T(int(d) / i); }              \
+inline T& operator/=(T& d, int i) { d = T(int(d) / i); return d; }
+
+ENABLE_OPERATORS_ON(Value)
+ENABLE_OPERATORS_ON(PieceType)
+ENABLE_OPERATORS_ON(Piece)
+ENABLE_OPERATORS_ON(Color)
+ENABLE_OPERATORS_ON(Depth)
+ENABLE_OPERATORS_ON(Square)
+ENABLE_OPERATORS_ON(File)
+ENABLE_OPERATORS_ON(Rank)
+
+/// Added operators for adding integers to a Value
+inline Value operator+(Value v, int i) { return Value(int(v) + i); }
+inline Value operator-(Value v, int i) { return Value(int(v) - i); }
+
+ENABLE_SAFE_OPERATORS_ON(Score)
+
+/// Only declared but not defined. We don't want to multiply two scores due to
+/// a very high risk of overflow. So user should explicitly convert to integer.
+inline Score operator*(Score s1, Score s2);
+
+/// Division of a Score must be handled separately for each term
+inline Score operator/(Score s, int i) {
+  return make_score(mg_value(s) / i, eg_value(s) / i);
+}
+
+#undef ENABLE_OPERATORS_ON
+#undef ENABLE_SAFE_OPERATORS_ON
+
+const Value PawnValueMidgame   = Value(0x0C6);
+const Value PawnValueEndgame   = Value(0x102);
+const Value KnightValueMidgame = Value(0x331);
+const Value KnightValueEndgame = Value(0x34E);
+const Value BishopValueMidgame = Value(0x344);
+const Value BishopValueEndgame = Value(0x359);
+const Value RookValueMidgame   = Value(0x4F6);
+const Value RookValueEndgame   = Value(0x4FE);
+const Value QueenValueMidgame  = Value(0x9D9);
+const Value QueenValueEndgame  = Value(0x9FE);
+
+extern const Value PieceValueMidgame[17];
+extern const Value PieceValueEndgame[17];
+extern int SquareDistance[64][64];
+
+inline Value mate_in(int ply) {
+  return VALUE_MATE - ply;
+}
+
+inline Value mated_in(int ply) {
+  return -VALUE_MATE + ply;
+}
+
+inline Piece make_piece(Color c, PieceType pt) {
+  return Piece((c << 3) | pt);
+}
+
+inline PieceType type_of(Piece p)  {
+  return PieceType(p & 7);
+}
+
+inline Color color_of(Piece p) {
+  return Color(p >> 3);
+}
+
+inline Color flip(Color c) {
+  return Color(c ^ 1);
+}
+
+inline Square make_square(File f, Rank r) {
+  return Square((r << 3) | f);
+}
+
+inline bool square_is_ok(Square s) {
+  return s >= SQ_A1 && s <= SQ_H8;
+}
+
+inline File file_of(Square s) {
+  return File(s & 7);
+}
+
+inline Rank rank_of(Square s) {
+  return Rank(s >> 3);
+}
+
+inline Square flip(Square s) {
+  return Square(s ^ 56);
+}
+
+inline Square mirror(Square s) {
+  return Square(s ^ 7);
+}
+
+inline Square relative_square(Color c, Square s) {
+  return Square(s ^ (c * 56));
+}
+
+inline Rank relative_rank(Color c, Rank r) {
+  return Rank(r ^ (c * 7));
+}
+
+inline Rank relative_rank(Color c, Square s) {
+  return relative_rank(c, rank_of(s));
+}
+
+inline bool opposite_colors(Square s1, Square s2) {
+  int s = s1 ^ s2;
+  return ((s >> 3) ^ s) & 1;
+}
+
+inline int file_distance(Square s1, Square s2) {
+  return abs(file_of(s1) - file_of(s2));
+}
+
+inline int rank_distance(Square s1, Square s2) {
+  return abs(rank_of(s1) - rank_of(s2));
+}
+
+inline int square_distance(Square s1, Square s2) {
+  return SquareDistance[s1][s2];
+}
+
+inline char piece_type_to_char(PieceType pt) {
+  return " PNBRQK"[pt];
+}
+
+inline char file_to_char(File f) {
+  return char(f - FILE_A + int('a'));
+}
+
+inline char rank_to_char(Rank r) {
+  return char(r - RANK_1 + int('1'));
+}
+
+inline Square pawn_push(Color c) {
+  return c == WHITE ? DELTA_N : DELTA_S;
+}
+
+inline Square from_sq(Move m) {
+  return Square((m >> 6) & 0x3F);
+}
+
+inline Square to_sq(Move m) {
+  return Square(m & 0x3F);
+}
+
+inline bool is_special(Move m) {
+  return m & (3 << 14);
+}
+
+inline bool is_promotion(Move m) {
+  return (m & (3 << 14)) == (1 << 14);
+}
+
+inline int is_enpassant(Move m) {
+  return (m & (3 << 14)) == (2 << 14);
+}
+
+inline int is_castle(Move m) {
+  return (m & (3 << 14)) == (3 << 14);
+}
+
+inline PieceType promotion_piece_type(Move m) {
+  return PieceType(((m >> 12) & 3) + 2);
+}
+
+inline Move make_move(Square from, Square to) {
+  return Move(to | (from << 6));
+}
+
+inline Move make_promotion(Square from, Square to, PieceType pt) {
+  return Move(to | (from << 6) | (1 << 14) | ((pt - 2) << 12)) ;
+}
+
+inline Move make_enpassant(Square from, Square to) {
+  return Move(to | (from << 6) | (2 << 14));
+}
+
+inline Move make_castle(Square from, Square to) {
+  return Move(to | (from << 6) | (3 << 14));
+}
+
+inline bool is_ok(Move m) {
+  return from_sq(m) != to_sq(m); // Catches also MOVE_NULL and MOVE_NONE
+}
+
+#include <string>
+
+inline const std::string square_to_string(Square s) {
+  char ch[] = { file_to_char(file_of(s)), rank_to_char(rank_of(s)), 0 };
+  return ch;
+}
+
+/// Our insertion sort implementation, works with pointers and iterators and is
+/// guaranteed to be stable, as is needed.
+template<typename T, typename K>
+void sort(K firstMove, K lastMove)
+{
+  T value;
+  K cur, p, d;
+
+  if (firstMove != lastMove)
+      for (cur = firstMove + 1; cur != lastMove; cur++)
+      {
+          p = d = cur;
+          value = *p--;
+          if (*p < value)
+          {
+              do *d = *p;
+              while (--d != firstMove && *--p < value);
+              *d = value;
+          }
+      }
+}
+
 #endif // !defined(TYPES_H_INCLUDED)

src/uci.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,309 +17,246 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
-#include <cassert>
 #include <iostream>
 #include <sstream>
 #include <string>
+#include <vector>
 
-#include "book.h"
 #include "evaluate.h"
 #include "misc.h"
-#include "move.h"
-#include "movegen.h"
 #include "position.h"
-#include "san.h"
 #include "search.h"
-#include "uci.h"
+#include "thread.h"
 #include "ucioption.h"
 
 using namespace std;
 
-////
-//// Local definitions:
-////
-
 namespace {
 
-  // UCIInputParser is a class for parsing UCI input. The class
-  // is actually a string stream built on a given input string.
+  // FEN string of the initial position, normal chess
+  const char* StartFEN = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1";
 
-  typedef istringstream UCIInputParser;
+  // Keep track of position keys along the setup moves (from start position to the
+  // position just before to start searching). This is needed by draw detection
+  // where, due to 50 moves rule, we need to check at most 100 plies back.
+  StateInfo StateRingBuf[102], *SetupState = StateRingBuf;
 
-  // The root position. This is set up when the user (or in practice, the GUI)
-  // sends the "position" UCI command. The root position is sent to the think()
-  // function when the program receives the "go" command.
-  Position RootPosition(0);
-
-  // Local functions
-  bool handle_command(const string& command);
-  void set_option(UCIInputParser& uip);
-  void set_position(UCIInputParser& uip);
-  bool go(UCIInputParser& uip);
-  void perft(UCIInputParser& uip);
+  void set_option(istringstream& up);
+  void set_position(Position& pos, istringstream& up);
+  void go(Position& pos, istringstream& up);
+  void perft(Position& pos, istringstream& up);
 }
 
 
-////
-//// Functions
-////
+/// Wait for a command from the user, parse this text string as an UCI command,
+/// and call the appropriate functions. Also intercepts EOF from stdin to ensure
+/// that we exit gracefully if the GUI dies unexpectedly. In addition to the UCI
+/// commands, the function also supports a few debug commands.
 
-/// uci_main_loop() is the only global function in this file. It is
-/// called immediately after the program has finished initializing.
-/// The program remains in this loop until it receives the "quit" UCI
-/// command. It waits for a command from the user, and passes this
-/// command to handle_command and also intercepts EOF from stdin,
-/// by translating EOF to the "quit" command. This ensures that Stockfish
-/// exits gracefully if the GUI dies unexpectedly.
+void uci_loop() {
 
-void uci_main_loop() {
+  Position pos(StartFEN, false, 0); // The root position
+  string cmd, token;
 
-  RootPosition.from_fen(StartPosition);
-  string command;
+  while (token != "quit")
+  {
+      if (!getline(cin, cmd)) // Block here waiting for input
+          cmd = "quit";
 
-  do {
-      // Wait for a command from stdin
-      if (!getline(cin, command))
-          command = "quit";
+      istringstream is(cmd);
 
-  } while (handle_command(command));
-}
+      is >> skipws >> token;
 
+      if (token == "quit" || token == "stop")
+          Threads.stop_thinking();
 
-////
-//// Local functions
-////
+      else if (token == "ponderhit")
+      {
+          // The opponent has played the expected move. GUI sends "ponderhit" if
+          // we were told to ponder on the same move the opponent has played. We
+          // should continue searching but switching from pondering to normal search.
+          Search::Limits.ponder = false;
 
-namespace {
+          if (Search::Signals.stopOnPonderhit)
+              Threads.stop_thinking();
+      }
 
-  // handle_command() takes a text string as input, uses a
-  // UCIInputParser object to parse this text string as a UCI command,
-  // and calls the appropriate functions. In addition to the UCI
-  // commands, the function also supports a few debug commands.
+      else if (token == "go")
+          go(pos, is);
 
-  bool handle_command(const string& command) {
+      else if (token == "ucinewgame")
+          pos.from_fen(StartFEN, false);
 
-    UCIInputParser uip(command);
-    string token;
+      else if (token == "isready")
+          cout << "readyok" << endl;
 
-    if (!(uip >> token)) // operator>>() skips any whitespace
-        return true;
+      else if (token == "position")
+          set_position(pos, is);
 
-    if (token == "quit")
-        return false;
+      else if (token == "setoption")
+          set_option(is);
 
-    if (token == "go")
-        return go(uip);
+      else if (token == "perft")
+          perft(pos, is);
 
-    if (token == "uci")
-    {
-        cout << "id name " << engine_name()
-             << "\nid author Tord Romstad, Marco Costalba, Joona Kiiski\n";
-        print_uci_options();
-        cout << "uciok" << endl;
-    }
-    else if (token == "ucinewgame")
-    {
-        push_button("New Game");
-        Position::init_piece_square_tables();
-        RootPosition.from_fen(StartPosition);
-    }
-    else if (token == "isready")
-        cout << "readyok" << endl;
-    else if (token == "position")
-        set_position(uip);
-    else if (token == "setoption")
-        set_option(uip);
+      else if (token == "d")
+          pos.print();
 
-    // The remaining commands are for debugging purposes only.
-    // Perhaps they should be removed later in order to reduce the
-    // size of the program binary.
-    else if (token == "d")
-        RootPosition.print();
-    else if (token == "flip")
-    {
-        Position p(RootPosition, RootPosition.thread());
-        RootPosition.flipped_copy(p);
-    }
-    else if (token == "eval")
-    {
-        EvalInfo ei;
-        cout << "Incremental mg: " << mg_value(RootPosition.value())
-             << "\nIncremental eg: " << eg_value(RootPosition.value())
-             << "\nFull eval: " << evaluate(RootPosition, ei) << endl;
-    }
-    else if (token == "key")
-        cout << "key: " << hex << RootPosition.get_key()
-             << "\nmaterial key: " << RootPosition.get_material_key()
-             << "\npawn key: " << RootPosition.get_pawn_key() << endl;
-    else if (token == "perft")
-        perft(uip);
-    else
-        cout << "Unknown command: " << command << endl;
+      else if (token == "flip")
+          pos.flip_me();
 
-    return true;
+      else if (token == "eval")
+      {
+          read_evaluation_uci_options(pos.side_to_move());
+          cout << trace_evaluate(pos) << endl;
+      }
+
+      else if (token == "key")
+          cout << "key: " << hex     << pos.key()
+               << "\nmaterial key: " << pos.material_key()
+               << "\npawn key: "     << pos.pawn_key() << endl;
+
+      else if (token == "uci")
+          cout << "id name "     << engine_info(true)
+               << "\n"           << Options
+               << "\nuciok"      << endl;
+      else
+          cout << "Unknown command: " << cmd << endl;
   }
+}
 
 
-  // set_position() is called when Stockfish receives the "position" UCI
-  // command. The input parameter is a UCIInputParser. It is assumed
-  // that this parser has consumed the first token of the UCI command
-  // ("position"), and is ready to read the second token ("startpos"
-  // or "fen", if the input is well-formed).
+namespace {
 
-  void set_position(UCIInputParser& uip) {
+  // set_position() is called when engine receives the "position" UCI
+  // command. The function sets up the position described in the given
+  // fen string ("fen") or the starting position ("startpos") and then
+  // makes the moves given in the following move list ("moves").
 
-    string token;
+  void set_position(Position& pos, istringstream& is) {
 
-    if (!(uip >> token)) // operator>>() skips any whitespace
-        return;
+    Move m;
+    string token, fen;
+
+    is >> token;
 
     if (token == "startpos")
-        RootPosition.from_fen(StartPosition);
-    else if (token == "fen")
     {
-        string fen;
-        while (uip >> token && token != "moves")
-        {
-            fen += token;
-            fen += ' ';
-        }
-        RootPosition.from_fen(fen);
+        fen = StartFEN;
+        is >> token; // Consume "moves" token if any
     }
+    else if (token == "fen")
+        while (is >> token && token != "moves")
+            fen += token + " ";
+    else
+        return;
 
-    if (uip.good())
+    pos.from_fen(fen, Options["UCI_Chess960"]);
+
+    // Parse move list (if any)
+    while (is >> token && (m = move_from_uci(pos, token)) != MOVE_NONE)
     {
-        if (token != "moves")
-          uip >> token;
+        pos.do_move(m, *SetupState);
 
-        if (token == "moves")
-        {
-            Move move;
-            StateInfo st;
-            while (uip >> token)
-            {
-                move = move_from_string(RootPosition, token);
-                RootPosition.do_move(move, st);
-                if (RootPosition.rule_50_counter() == 0)
-                    RootPosition.reset_game_ply();
-            }
-            // Our StateInfo st is about going out of scope so copy
-            // its content inside RootPosition before they disappear.
-            RootPosition.detach();
-        }
+        // Increment pointer to StateRingBuf circular buffer
+        if (++SetupState - StateRingBuf >= 102)
+            SetupState = StateRingBuf;
     }
   }
 
 
-  // set_option() is called when Stockfish receives the "setoption" UCI
-  // command. The input parameter is a UCIInputParser. It is assumed
-  // that this parser has consumed the first token of the UCI command
-  // ("setoption"), and is ready to read the second token ("name", if
-  // the input is well-formed).
+  // set_option() is called when engine receives the "setoption" UCI command. The
+  // function updates the UCI option ("name") to the given value ("value").
 
-  void set_option(UCIInputParser& uip) {
+  void set_option(istringstream& is) {
 
     string token, name, value;
 
-    if (!(uip >> token)) // operator>>() skips any whitespace
-        return;
+    is >> token; // Consume "name" token
 
-    if (token == "name" && uip >> name)
-    {
-        while (uip >> token && token != "value")
-            name += (" " + token);
+    // Read option name (can contain spaces)
+    while (is >> token && token != "value")
+        name += string(" ", !name.empty()) + token;
 
-        if (token == "value" && uip >> value)
-        {
-            while (uip >> token)
-                value += (" " + token);
+    // Read option value (can contain spaces)
+    while (is >> token)
+        value += string(" ", !value.empty()) + token;
 
-            set_option_value(name, value);
-        } else
-            push_button(name);
-    }
+    if (!Options.count(name))
+        cout << "No such option: " << name << endl;
+
+    else if (value.empty()) // UCI buttons don't have a value
+        Options[name] = true;
+
+    else
+        Options[name] = value;
   }
 
 
-  // go() is called when Stockfish receives the "go" UCI command. The
-  // input parameter is a UCIInputParser. It is assumed that this
-  // parser has consumed the first token of the UCI command ("go"),
-  // and is ready to read the second token. The function sets the
-  // thinking time and other parameters from the input string, and
-  // calls think() (defined in search.cpp) with the appropriate
-  // parameters. Returns false if a quit command is received while
-  // thinking, returns true otherwise.
+  // go() is called when engine receives the "go" UCI command. The function sets
+  // the thinking time and other parameters from the input string, and then starts
+  // the main searching thread.
 
-  bool go(UCIInputParser& uip) {
+  void go(Position& pos, istringstream& is) {
 
     string token;
+    Search::LimitsType limits;
+    std::vector<Move> searchMoves;
+    int time[] = { 0, 0 }, inc[] = { 0, 0 };
 
-    int time[2] = {0, 0}, inc[2] = {0, 0};
-    int movesToGo = 0, depth = 0, nodes = 0, moveTime = 0;
-    bool infinite = false, ponder = false;
-    Move searchMoves[500];
-
-    searchMoves[0] = MOVE_NONE;
-
-    while (uip >> token)
+    while (is >> token)
     {
         if (token == "infinite")
-            infinite = true;
+            limits.infinite = true;
         else if (token == "ponder")
-            ponder = true;
+            limits.ponder = true;
         else if (token == "wtime")
-            uip >> time[0];
+            is >> time[WHITE];
         else if (token == "btime")
-            uip >> time[1];
+            is >> time[BLACK];
         else if (token == "winc")
-            uip >> inc[0];
+            is >> inc[WHITE];
         else if (token == "binc")
-            uip >> inc[1];
+            is >> inc[BLACK];
         else if (token == "movestogo")
-            uip >> movesToGo;
+            is >> limits.movesToGo;
         else if (token == "depth")
-            uip >> depth;
+            is >> limits.maxDepth;
         else if (token == "nodes")
-            uip >> nodes;
+            is >> limits.maxNodes;
         else if (token == "movetime")
-            uip >> moveTime;
+            is >> limits.maxTime;
         else if (token == "searchmoves")
-        {
-            int numOfMoves = 0;
-            while (uip >> token)
-                searchMoves[numOfMoves++] = move_from_string(RootPosition, token);
-
-            searchMoves[numOfMoves] = MOVE_NONE;
-        }
+            while (is >> token)
+                searchMoves.push_back(move_from_uci(pos, token));
     }
 
-    assert(RootPosition.is_ok());
+    limits.time = time[pos.side_to_move()];
+    limits.increment = inc[pos.side_to_move()];
 
-    return think(RootPosition, infinite, ponder, RootPosition.side_to_move(),
-                 time, inc, movesToGo, depth, nodes, moveTime, searchMoves);
+    Threads.start_thinking(pos, limits, searchMoves, true);
   }
 
-  void perft(UCIInputParser& uip) {
 
-    string token;
-    int depth, tm, n;
-    Position pos(RootPosition, RootPosition.thread());
+  // perft() is called when engine receives the "perft" command. The function
+  // calls perft() with the required search depth then prints counted leaf nodes
+  // and elapsed time.
 
-    if (!(uip >> depth))
+  void perft(Position& pos, istringstream& is) {
+
+    int depth, time;
+
+    if (!(is >> depth))
         return;
 
-    tm = get_system_time();
+    time = system_time();
 
-    n = perft(pos, depth * OnePly);
+    int64_t n = Search::perft(pos, depth * ONE_PLY);
+
+    time = system_time() - time;
 
-    tm = get_system_time() - tm;
     std::cout << "\nNodes " << n
-              << "\nTime (ms) " << tm
-              << "\nNodes/second " << (int)(n/(tm/1000.0)) << std::endl;
+              << "\nTime (ms) " << time
+              << "\nNodes/second " << int(n / (time / 1000.0)) << std::endl;
   }
 }

src/uci.h

@@ -1,31 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(UCI_H_INCLUDED)
-#define UCI_H_INCLUDED
-
-////
-//// Prototypes
-////
-
-extern void uci_main_loop();
-
-
-#endif // !defined(UCI_H_INCLUDED)

src/ucioption.cpp

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,17 +17,8 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
-////
-//// Includes
-////
-
 #include <algorithm>
-#include <cassert>
-#include <map>
-#include <string>
 #include <sstream>
-#include <vector>
 
 #include "misc.h"
 #include "thread.h"
@@ -35,308 +26,102 @@
 
 using std::string;
 
-////
-//// Local definitions
-////
-
-namespace {
-
-  ///
-  /// Types
-  ///
-
-  enum OptionType { SPIN, COMBO, CHECK, STRING, BUTTON };
-
-  typedef std::vector<string> ComboValues;
-
-  struct Option {
-
-    string name, defaultValue, currentValue;
-    OptionType type;
-    size_t idx;
-    int minValue, maxValue;
-    ComboValues comboValues;
-
-    Option();
-    Option(const char* defaultValue, OptionType = STRING);
-    Option(bool defaultValue, OptionType = CHECK);
-    Option(int defaultValue, int minValue, int maxValue);
-
-    bool operator<(const Option& o) const { return this->idx < o.idx; }
-  };
-
-  typedef std::map<string, Option> Options;
-
-  ///
-  /// Constants
-  ///
-
-  // load_defaults populates the options map with the hard
-  // coded names and default values.
-
-  void load_defaults(Options& o) {
-
-    o["Use Search Log"] = Option(false);
-    o["Search Log Filename"] = Option("SearchLog.txt");
-    o["Book File"] = Option("book.bin");
-    o["Best Book Move"] = Option(false);
-    o["Mobility (Middle Game)"] = Option(100, 0, 200);
-    o["Mobility (Endgame)"] = Option(100, 0, 200);
-    o["Pawn Structure (Middle Game)"] = Option(100, 0, 200);
-    o["Pawn Structure (Endgame)"] = Option(100, 0, 200);
-    o["Passed Pawns (Middle Game)"] = Option(100, 0, 200);
-    o["Passed Pawns (Endgame)"] = Option(100, 0, 200);
-    o["Space"] = Option(100, 0, 200);
-    o["Aggressiveness"] = Option(100, 0, 200);
-    o["Cowardice"] = Option(100, 0, 200);
-    o["Check Extension (PV nodes)"] = Option(2, 0, 2);
-    o["Check Extension (non-PV nodes)"] = Option(1, 0, 2);
-    o["Single Evasion Extension (PV nodes)"] = Option(2, 0, 2);
-    o["Single Evasion Extension (non-PV nodes)"] = Option(2, 0, 2);
-    o["Mate Threat Extension (PV nodes)"] = Option(2, 0, 2);
-    o["Mate Threat Extension (non-PV nodes)"] = Option(2, 0, 2);
-    o["Pawn Push to 7th Extension (PV nodes)"] = Option(1, 0, 2);
-    o["Pawn Push to 7th Extension (non-PV nodes)"] = Option(1, 0, 2);
-    o["Passed Pawn Extension (PV nodes)"] = Option(1, 0, 2);
-    o["Passed Pawn Extension (non-PV nodes)"] = Option(0, 0, 2);
-    o["Pawn Endgame Extension (PV nodes)"] = Option(2, 0, 2);
-    o["Pawn Endgame Extension (non-PV nodes)"] = Option(2, 0, 2);
-    o["Randomness"] = Option(0, 0, 10);
-    o["Minimum Split Depth"] = Option(4, 4, 7);
-    o["Maximum Number of Threads per Split Point"] = Option(5, 4, 8);
-    o["Threads"] = Option(1, 1, MAX_THREADS);
-    o["Hash"] = Option(32, 4, 8192);
-    o["Clear Hash"] = Option(false, BUTTON);
-    o["New Game"] = Option(false, BUTTON);
-    o["Ponder"] = Option(true);
-    o["OwnBook"] = Option(true);
-    o["MultiPV"] = Option(1, 1, 500);
-    o["UCI_Chess960"] = Option(false);
-    o["UCI_AnalyseMode"] = Option(false);
-
-    // Any option should know its name so to be easily printed
-    for (Options::iterator it = o.begin(); it != o.end(); ++it)
-        it->second.name = it->first;
-  }
-
-  ///
-  /// Variables
-  ///
-
-  Options options;
-
-  // stringify converts a value of type T to a std::string
-  template<typename T>
-  string stringify(const T& v) {
-
-     std::ostringstream ss;
-     ss << v;
-     return ss.str();
-  }
+OptionsMap Options; // Global object
 
 
-  // get_option_value implements the various get_option_value_<type>
-  // functions defined later, because only the option value
-  // type changes a template seems a proper solution.
+/// Our case insensitive less() function as required by UCI protocol
+static bool ci_less(char c1, char c2) { return tolower(c1) < tolower(c2); }
 
-  template<typename T>
-  T get_option_value(const string& optionName) {
-
-      T ret = T();
-      if (options.find(optionName) == options.end())
-          return ret;
-
-      std::istringstream ss(options[optionName].currentValue);
-      ss >> ret;
-      return ret;
-  }
-
-  // Specialization for std::string where instruction 'ss >> ret;'
-  // would erroneusly tokenize a string with spaces.
-
-  template<>
-  string get_option_value<string>(const string& optionName) {
-
-      if (options.find(optionName) == options.end())
-          return string();
-
-      return options[optionName].currentValue;
-  }
-
-}
-
-////
-//// Functions
-////
-
-/// init_uci_options() initializes the UCI options.  Currently, the only
-/// thing this function does is to initialize the default value of the
-/// "Threads" parameter to the number of available CPU cores.
-
-void init_uci_options() {
-
-  load_defaults(options);
-
-  // Set optimal value for parameter "Minimum Split Depth"
-  // according to number of available cores.
-  assert(options.find("Threads") != options.end());
-  assert(options.find("Minimum Split Depth") != options.end());
-
-  Option& thr = options["Threads"];
-  Option& msd = options["Minimum Split Depth"];
-
-  thr.defaultValue = thr.currentValue = stringify(cpu_count());
-
-  if (cpu_count() >= 8)
-      msd.defaultValue = msd.currentValue = stringify(7);
+bool CaseInsensitiveLess::operator() (const string& s1, const string& s2) const {
+  return lexicographical_compare(s1.begin(), s1.end(), s2.begin(), s2.end(), ci_less);
 }
 
 
-/// print_uci_options() prints all the UCI options to the standard output,
-/// in the format defined by the UCI protocol.
+/// OptionsMap c'tor initializes the UCI options to their hard coded default
+/// values and initializes the default value of "Threads" and "Min Split Depth"
+/// parameters according to the number of CPU cores detected.
 
-void print_uci_options() {
+OptionsMap::OptionsMap() {
 
-  static const char optionTypeName[][16] = {
-    "spin", "combo", "check", "string", "button"
-  };
+  int cpus = std::min(cpu_count(), MAX_THREADS);
+  int msd = cpus < 8 ? 4 : 7;
+  OptionsMap& o = *this;
 
-  // Build up a vector out of the options map and sort it according to idx
-  // field, that is the chronological insertion order in options map.
-  std::vector<Option> vec;
-  for (Options::const_iterator it = options.begin(); it != options.end(); ++it)
-      vec.push_back(it->second);
-
-  std::sort(vec.begin(), vec.end());
-
-  for (std::vector<Option>::const_iterator it = vec.begin(); it != vec.end(); ++it)
-  {
-      std::cout << "\noption name " << it->name
-                << " type "         << optionTypeName[it->type];
-
-      if (it->type == BUTTON)
-          continue;
-
-      if (it->type == CHECK)
-          std::cout << " default " << (it->defaultValue == "1" ? "true" : "false");
-      else
-          std::cout << " default " << it->defaultValue;
-
-      if (it->type == SPIN)
-          std::cout << " min " << it->minValue << " max " << it->maxValue;
-      else if (it->type == COMBO)
-          for (ComboValues::const_iterator itc = it->comboValues.begin();
-              itc != it->comboValues.end(); ++itc)
-              std::cout << " var " << *itc;
-  }
-  std::cout << std::endl;
+  o["Use Search Log"]              = UCIOption(false);
+  o["Search Log Filename"]         = UCIOption("SearchLog.txt");
+  o["Book File"]                   = UCIOption("book.bin");
+  o["Best Book Move"]              = UCIOption(false);
+  o["Mobility (Middle Game)"]      = UCIOption(100, 0, 200);
+  o["Mobility (Endgame)"]          = UCIOption(100, 0, 200);
+  o["Passed Pawns (Middle Game)"]  = UCIOption(100, 0, 200);
+  o["Passed Pawns (Endgame)"]      = UCIOption(100, 0, 200);
+  o["Space"]                       = UCIOption(100, 0, 200);
+  o["Aggressiveness"]              = UCIOption(100, 0, 200);
+  o["Cowardice"]                   = UCIOption(100, 0, 200);
+  o["Min Split Depth"]             = UCIOption(msd, 4, 7);
+  o["Max Threads per Split Point"] = UCIOption(5, 4, 8);
+  o["Threads"]                     = UCIOption(cpus, 1, MAX_THREADS);
+  o["Use Sleeping Threads"]        = UCIOption(false);
+  o["Hash"]                        = UCIOption(32, 4, 8192);
+  o["Clear Hash"]                  = UCIOption(false, "button");
+  o["Ponder"]                      = UCIOption(true);
+  o["OwnBook"]                     = UCIOption(true);
+  o["MultiPV"]                     = UCIOption(1, 1, 500);
+  o["Skill Level"]                 = UCIOption(20, 0, 20);
+  o["Emergency Move Horizon"]      = UCIOption(40, 0, 50);
+  o["Emergency Base Time"]         = UCIOption(200, 0, 30000);
+  o["Emergency Move Time"]         = UCIOption(70, 0, 5000);
+  o["Minimum Thinking Time"]       = UCIOption(20, 0, 5000);
+  o["UCI_Chess960"]                = UCIOption(false);
+  o["UCI_AnalyseMode"]             = UCIOption(false);
 }
 
 
-/// get_option_value_bool() returns the current value of a UCI parameter of
-/// type "check".
+/// operator<<() is used to output all the UCI options in chronological insertion
+/// order (the idx field) and in the format defined by the UCI protocol.
+std::ostream& operator<<(std::ostream& os, const OptionsMap& om) {
 
-bool get_option_value_bool(const string& optionName) {
+  for (size_t idx = 0; idx < om.size(); idx++)
+      for (OptionsMap::const_iterator it = om.begin(); it != om.end(); ++it)
+          if (it->second.idx == idx)
+          {
+              const UCIOption& o = it->second;
+              os << "\noption name " << it->first << " type " << o.type;
 
-  return get_option_value<bool>(optionName);
+              if (o.type != "button")
+                  os << " default " << o.defaultValue;
+
+              if (o.type == "spin")
+                  os << " min " << o.min << " max " << o.max;
+
+              break;
+          }
+  return os;
 }
 
 
-/// get_option_value_int() returns the value of a UCI parameter as an integer.
-/// Normally, this function will be used for a parameter of type "spin", but
-/// it could also be used with a "combo" parameter, where all the available
-/// values are integers.
+/// UCIOption class c'tors
 
-int get_option_value_int(const string& optionName) {
-
-  return get_option_value<int>(optionName);
-}
-
-
-/// get_option_value_string() returns the current value of a UCI parameter as
-/// a string. It is used with parameters of type "combo" and "string".
-
-string get_option_value_string(const string& optionName) {
-
-   return get_option_value<string>(optionName);
-}
-
-
-/// set_option_value() inserts a new value for a UCI parameter. Note that
-/// the function does not check that the new value is legal for the given
-/// parameter: This is assumed to be the responsibility of the GUI.
-
-void set_option_value(const string& name, const string& value) {
-
-  // UCI protocol uses "true" and "false" instead of "1" and "0", so convert
-  // value according to standard C++ convention before to store it.
-  string v(value);
-  if (v == "true")
-      v = "1";
-  else if (v == "false")
-      v = "0";
-
-  if (options.find(name) == options.end())
-  {
-      std::cout << "No such option: " << name << std::endl;
-      return;
-  }
-
-  // Normally it's up to the GUI to check for option's limits,
-  // but we could receive the new value directly from the user
-  // by teminal window. So let's check the bounds anyway.
-  Option& opt = options[name];
-
-  if (opt.type == CHECK && v != "0" && v != "1")
-      return;
-
-  else if (opt.type == SPIN)
-  {
-      int val = atoi(v.c_str());
-      if (val < opt.minValue || val > opt.maxValue)
-          return;
-  }
-
-  opt.currentValue = v;
-}
-
-
-/// push_button() is used to tell the engine that a UCI parameter of type
-/// "button" has been selected:
-
-void push_button(const string& buttonName) {
-
-  set_option_value(buttonName, "true");
-}
-
-
-/// button_was_pressed() tests whether a UCI parameter of type "button" has
-/// been selected since the last time the function was called, in this case
-/// it also resets the button.
-
-bool button_was_pressed(const string& buttonName) {
-
-  if (!get_option_value<bool>(buttonName))
-      return false;
-
-  set_option_value(buttonName, "false");
-  return true;
-}
-
-
-namespace {
-
-  // Define constructors of Option class.
-
-  Option::Option() {} // To allow insertion in a std::map
-
-  Option::Option(const char* def, OptionType t)
-  : defaultValue(def), currentValue(def), type(t), idx(options.size()), minValue(0), maxValue(0) {}
-
-  Option::Option(bool def, OptionType t)
-  : defaultValue(stringify(def)), currentValue(stringify(def)), type(t), idx(options.size()), minValue(0), maxValue(0) {}
-
-  Option::Option(int def, int minv, int maxv)
-  : defaultValue(stringify(def)), currentValue(stringify(def)), type(SPIN), idx(options.size()), minValue(minv), maxValue(maxv) {}
+UCIOption::UCIOption(const char* v) : type("string"), min(0), max(0), idx(Options.size())
+{ defaultValue = currentValue = v; }
 
+UCIOption::UCIOption(bool v, string t) : type(t), min(0), max(0), idx(Options.size())
+{ defaultValue = currentValue = (v ? "true" : "false"); }
+
+UCIOption::UCIOption(int v, int minv, int maxv) : type("spin"), min(minv), max(maxv), idx(Options.size())
+{ std::ostringstream ss; ss << v; defaultValue = currentValue = ss.str(); }
+
+
+/// UCIOption::operator=() updates currentValue. Normally it's up to the GUI to
+/// check for option's limits, but we could receive the new value directly from
+/// the user by teminal window, so let's check the bounds anyway.
+
+void UCIOption::operator=(const string& v) {
+
+  assert(!type.empty());
+
+  if (   !v.empty()
+      && (type == "check" || type == "button") == (v == "true" || v == "false")
+      && (type != "spin" || (atoi(v.c_str()) >= min && atoi(v.c_str()) <= max)))
+      currentValue = v;
 }

src/ucioption.h

@@ -1,7 +1,7 @@
 /*
   Stockfish, a UCI chess playing engine derived from Glaurung 2.1
   Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
+  Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
 
   Stockfish is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
@@ -17,28 +17,58 @@
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
 
-
 #if !defined(UCIOPTION_H_INCLUDED)
 #define UCIOPTION_H_INCLUDED
 
-////
-//// Includes
-////
-
+#include <cassert>
+#include <cstdlib>
+#include <map>
 #include <string>
 
-////
-//// Prototypes
-////
+struct OptionsMap;
 
-extern void init_uci_options();
-extern void print_uci_options();
-extern bool get_option_value_bool(const std::string& optionName);
-extern int get_option_value_int(const std::string& optionName);
-extern std::string get_option_value_string(const std::string& optionName);
-extern bool button_was_pressed(const std::string& buttonName);
-extern void set_option_value(const std::string& optionName,const std::string& newValue);
-extern void push_button(const std::string& buttonName);
+/// UCIOption class implements an option as defined by UCI protocol
+class UCIOption {
+public:
+  UCIOption() {} // Required by std::map::operator[]
+  UCIOption(const char* v);
+  UCIOption(bool v, std::string type = "check");
+  UCIOption(int v, int min, int max);
 
+  void operator=(const std::string& v);
+  void operator=(bool v) { *this = std::string(v ? "true" : "false"); }
+
+  operator int() const {
+    assert(type == "check" || type == "button" || type == "spin");
+    return (type == "spin" ? atoi(currentValue.c_str()) : currentValue == "true");
+  }
+
+  operator std::string() const {
+    assert(type == "string");
+    return currentValue;
+  }
+
+private:
+  friend std::ostream& operator<<(std::ostream&, const OptionsMap&);
+
+  std::string defaultValue, currentValue, type;
+  int min, max;
+  size_t idx;
+};
+
+
+/// Custom comparator because UCI options should be case insensitive
+struct CaseInsensitiveLess {
+  bool operator() (const std::string&, const std::string&) const;
+};
+
+
+/// Our options container is actually a map with a customized c'tor
+struct OptionsMap : public std::map<std::string, UCIOption, CaseInsensitiveLess> {
+  OptionsMap();
+};
+
+extern std::ostream& operator<<(std::ostream&, const OptionsMap&);
+extern OptionsMap Options;
 
 #endif // !defined(UCIOPTION_H_INCLUDED)

src/value.cpp

@@ -1,96 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-////
-//// Includes
-////
-
-#include <sstream>
-#include <string>
-
-#include "value.h"
-
-
-////
-//// Functions
-////
-
-/// value_to_tt() adjusts a mate score from "plies to mate from the root" to
-/// "plies to mate from the current ply".  Non-mate scores are unchanged.
-/// The function is called before storing a value to the transposition table.
-
-Value value_to_tt(Value v, int ply) {
-  if(v >= value_mate_in(100))
-    return v + ply;
-  else if(v <= value_mated_in(100))
-    return v - ply;
-  else
-    return v;
-}
-
-
-/// value_from_tt() is the inverse of value_to_tt():  It adjusts a mate score
-/// from the transposition table to a mate score corrected for the current
-/// ply depth.
-
-Value value_from_tt(Value v, int ply) {
-  if(v >= value_mate_in(100))
-    return v - ply;
-  else if(v <= value_mated_in(100))
-    return v + ply;
-  else
-    return v;
-}
-
-
-/// value_to_centipawns() converts a value from Stockfish's somewhat unusual
-/// scale of pawn = 256 to the more conventional pawn = 100.
-
-int value_to_centipawns(Value v) {
-  return (int(v) * 100) / int(PawnValueMidgame);
-}
-
-
-/// value_from_centipawns() converts a centipawn value to Stockfish's internal
-/// evaluation scale.  It's used when reading the values of UCI options
-/// containing material values (e.g. futility pruning margins).
-
-Value value_from_centipawns(int cp) {
-  return Value((cp * 256) / 100);
-}
-
-
-/// value_to_string() converts a value to a string suitable for use with the
-/// UCI protocol.
-
-const std::string value_to_string(Value v) {
-  std::stringstream s;
-
-  if(abs(v) < VALUE_MATE - 200)
-    s << "cp " << value_to_centipawns(v);
-  else {
-    s << "mate ";
-    if(v > 0)
-      s << (VALUE_MATE - v + 1) / 2;
-    else
-      s << -(VALUE_MATE + v) / 2;
-  }
-  return s.str();
-}

src/value.h

@@ -1,205 +0,0 @@
-/*
-  Stockfish, a UCI chess playing engine derived from Glaurung 2.1
-  Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
-  Copyright (C) 2008-2010 Marco Costalba, Joona Kiiski, Tord Romstad
-
-  Stockfish is free software: you can redistribute it and/or modify
-  it under the terms of the GNU General Public License as published by
-  the Free Software Foundation, either version 3 of the License, or
-  (at your option) any later version.
-
-  Stockfish is distributed in the hope that it will be useful,
-  but WITHOUT ANY WARRANTY; without even the implied warranty of
-  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-  GNU General Public License for more details.
-
-  You should have received a copy of the GNU General Public License
-  along with this program.  If not, see <http://www.gnu.org/licenses/>.
-*/
-
-
-#if !defined(VALUE_H_INCLUDED)
-#define VALUE_H_INCLUDED
-
-////
-//// Includes
-////
-
-#include "piece.h"
-
-
-////
-//// Types
-////
-
-enum ValueType {
-  VALUE_TYPE_NONE  = 0,
-  VALUE_TYPE_UPPER = 1,  // Upper bound
-  VALUE_TYPE_LOWER = 2,  // Lower bound
-  VALUE_TYPE_EXACT = VALUE_TYPE_UPPER | VALUE_TYPE_LOWER
-};
-
-
-enum Value {
-  VALUE_DRAW = 0,
-  VALUE_KNOWN_WIN = 15000,
-  VALUE_MATE = 30000,
-  VALUE_INFINITE = 30001,
-  VALUE_NONE = 30002,
-  VALUE_ENSURE_SIGNED = -1
-};
-
-
-/// Score enum keeps a midgame and an endgame value in a single
-/// integer (enum), first LSB 16 bits are used to store endgame
-/// value, while upper bits are used for midgame value.
-
-// Compiler is free to choose the enum type as long as can keep
-// its data, so ensure Score to be an integer type.
-enum Score { ENSURE_32_BITS_SIZE_P = (1 << 16), ENSURE_32_BITS_SIZE_N = -(1 << 16)};
-
-// Extracting the _signed_ lower and upper 16 bits it not so trivial
-// because according to the standard a simple cast to short is
-// implementation defined and so is a right shift of a signed integer.
-inline Value mg_value(Score s) { return Value(((int(s) + 32768) & ~0xffff) / 0x10000); }
-
-// Unfortunatly on Intel 64 bit we have a small speed regression, so use a faster code in
-// this case, although not 100% standard compliant it seems to work for Intel and MSVC.
-#if defined(IS_64BIT) && (!defined(__GNUC__) || defined(__INTEL_COMPILER))
-inline Value eg_value(Score s) { return Value(int16_t(s & 0xffff)); }
-#else
-inline Value eg_value(Score s) { return Value((int)(unsigned(s) & 0x7fffu) - (int)(unsigned(s) & 0x8000u)); }
-#endif
-
-inline Score make_score(int mg, int eg) { return Score((mg << 16) + eg); }
-
-inline Score operator-(Score s) { return Score(-int(s)); }
-inline Score operator+(Score s1, Score s2) { return Score(int(s1) + int(s2)); }
-inline Score operator-(Score s1, Score s2) { return Score(int(s1) - int(s2)); }
-inline void operator+=(Score& s1, Score s2) { s1 = Score(int(s1) + int(s2)); }
-inline void operator-=(Score& s1, Score s2) { s1 = Score(int(s1) - int(s2)); }
-inline Score operator*(int i, Score s) { return Score(i * int(s)); }
-
-// Division must be handled separately for each term
-inline Score operator/(Score s, int i) { return make_score(mg_value(s) / i, eg_value(s) / i); }
-
-// Only declared but not defined. We don't want to multiply two scores due to
-// a very high risk of overflow. So user should explicitly convert to integer.
-inline Score operator*(Score s1, Score s2);
-
-
-////
-//// Constants and variables
-////
-
-/// Piece values, middle game and endgame
-
-/// Important: If the material values are changed, one must also
-/// adjust the piece square tables, and the method game_phase() in the
-/// Position class!
-///
-/// Values modified by Joona Kiiski
-
-const Value PawnValueMidgame   = Value(0x0C6);
-const Value PawnValueEndgame   = Value(0x102);
-const Value KnightValueMidgame = Value(0x331);
-const Value KnightValueEndgame = Value(0x34E);
-const Value BishopValueMidgame = Value(0x344);
-const Value BishopValueEndgame = Value(0x359);
-const Value RookValueMidgame   = Value(0x4F6);
-const Value RookValueEndgame   = Value(0x4FE);
-const Value QueenValueMidgame  = Value(0x9D9);
-const Value QueenValueEndgame  = Value(0x9FE);
-
-const Value PieceValueMidgame[17] = {
-  Value(0),
-  PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
-  RookValueMidgame, QueenValueMidgame,
-  Value(0), Value(0), Value(0),
-  PawnValueMidgame, KnightValueMidgame, BishopValueMidgame,
-  RookValueMidgame, QueenValueMidgame,
-  Value(0), Value(0), Value(0)
-};
-
-const Value PieceValueEndgame[17] = {
-  Value(0),
-  PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
-  RookValueEndgame, QueenValueEndgame,
-  Value(0), Value(0), Value(0),
-  PawnValueEndgame, KnightValueEndgame, BishopValueEndgame,
-  RookValueEndgame, QueenValueEndgame,
-  Value(0), Value(0), Value(0)
-};
-
-/// Bonus for having the side to move (modified by Joona Kiiski)
-
-const Score TempoValue = make_score(48, 22);
-
-
-////
-//// Inline functions
-////
-
-inline Value operator+ (Value v, int i) { return Value(int(v) + i); }
-inline Value operator+ (Value v1, Value v2) { return Value(int(v1) + int(v2)); }
-inline void operator+= (Value &v1, Value v2) {
-  v1 = Value(int(v1) + int(v2));
-}
-inline Value operator- (Value v, int i) { return Value(int(v) - i); }
-inline Value operator- (Value v) { return Value(-int(v)); }
-inline Value operator- (Value v1, Value v2) { return Value(int(v1) - int(v2)); }
-inline void operator-= (Value &v1, Value v2) {
-  v1 = Value(int(v1) - int(v2));
-}
-inline Value operator* (Value v, int i) { return Value(int(v) * i); }
-inline void operator*= (Value &v, int i) { v = Value(int(v) * i); }
-inline Value operator* (int i, Value v) { return Value(int(v) * i); }
-inline Value operator/ (Value v, int i) { return Value(int(v) / i); }
-inline void operator/= (Value &v, int i) { v = Value(int(v) / i); }
-
-
-inline Value value_mate_in(int ply) {
-  return Value(VALUE_MATE - Value(ply));
-}
-
-inline Value value_mated_in(int ply) {
-  return Value(-VALUE_MATE + Value(ply));
-}
-
-inline bool is_upper_bound(ValueType vt) {
-  return (int(vt) & int(VALUE_TYPE_UPPER)) != 0;
-}
-
-inline bool is_lower_bound(ValueType vt) {
-  return (int(vt) & int(VALUE_TYPE_LOWER)) != 0;
-}
-
-inline Value piece_value_midgame(PieceType pt) {
-  return PieceValueMidgame[pt];
-}
-
-inline Value piece_value_endgame(PieceType pt) {
-  return PieceValueEndgame[pt];
-}
-
-inline Value piece_value_midgame(Piece p) {
-  return PieceValueMidgame[p];
-}
-
-inline Value piece_value_endgame(Piece p) {
-  return PieceValueEndgame[p];
-}
-
-
-////
-//// Prototypes
-////
-
-extern Value value_to_tt(Value v, int ply);
-extern Value value_from_tt(Value v, int ply);
-extern int value_to_centipawns(Value v);
-extern Value value_from_centipawns(int cp);
-extern const std::string value_to_string(Value v);
-
-
-#endif // !defined(VALUE_H_INCLUDED)