Stockfish 1.3

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

polyglot.ini

@@ -2,13 +2,13 @@
 [PolyGlot]
 
 EngineDir = .
-EngineCommand = ./glaurung
+EngineCommand = ./stockfish
 
 Book = false
 BookFile = book.bin
 
 Log = true
-LogFile = glaurung.log
+LogFile = stockfish.log
 
 Resign = true
 ResignScore = 600
@@ -34,8 +34,7 @@ King Safety Coefficient = 40
 King Safety X Intercept = 0
 King Safety Max Slope = 30
 King Safety Max Value = 500
-Queen Contact Check Bonus = 4
-Rook Contact Check Bonus = 2
+Queen Contact Check Bonus = 3
 Queen Check Bonus = 2
 Rook Check Bonus = 1
 Bishop Check Bonus = 1
@@ -57,14 +56,8 @@ Pawn Endgame Extension (non-PV nodes) = 2
 Full Depth Moves (PV nodes) = 14
 Full Depth Moves (non-PV nodes) = 3
 Threat Depth = 5
-Selective Plies = 7
 Futility Pruning (Main Search) = true
 Futility Pruning (Quiescence Search) = true
-Futility Margin 0 = 50
-Futility Margin 1 = 100
-Futility Margin 2 = 300
-Maximum Razoring Depth = 3
-Razoring Margin = 300
 Randomness = 0
 Minimum Split Depth = 4
 Maximum Number of Threads per Split Point = 5

src/misc.cpp

@@ -71,7 +71,7 @@ using namespace std;
 /// Version number. If this is left empty, the current date (in the format
 /// YYMMDD) is used as a version number.
 
-static const string EngineVersion = "1.3rc1";
+static const string EngineVersion = "1.3";
 static const string AppName = "Stockfish";
 static const string AppTag  = "";
 

src/move.h

@@ -62,6 +62,9 @@ struct MoveStack {
   int score;
 };
 
+// Note that operator< is set up such that std::sort() will sort in descending order
+inline bool operator<(const MoveStack& f, const MoveStack& s) { return s.score < f.score; }
+
 
 ////
 //// Inline functions

src/movepick.cpp

@@ -23,6 +23,7 @@
 //// Includes
 ////
 
+#include <algorithm>
 #include <cassert>
 
 #include "history.h"
@@ -136,16 +137,19 @@ Move MovePicker::get_next_move() {
     case PH_GOOD_CAPTURES:
         numOfMoves = generate_captures(pos, moves);
         score_captures();
+        std::sort(moves, moves + numOfMoves);
         movesPicked = 0;
         break;
 
     case PH_BAD_CAPTURES:
+        // It's probably a good idea to use SEE move ordering here. FIXME
         movesPicked = 0;
         break;
 
     case PH_NONCAPTURES:
         numOfMoves = generate_noncaptures(pos, moves);
         score_noncaptures();
+        std::sort(moves, moves + numOfMoves);
         movesPicked = 0;
         break;
 
@@ -153,16 +157,19 @@ Move MovePicker::get_next_move() {
         assert(pos.is_check());
         numOfMoves = generate_evasions(pos, moves, pinned);
         score_evasions();
+        std::sort(moves, moves + numOfMoves);
         movesPicked = 0;
         break;
 
     case PH_QCAPTURES:
         numOfMoves = generate_captures(pos, moves);
         score_qcaptures();
+        std::sort(moves, moves + numOfMoves);
         movesPicked = 0;
         break;
 
     case PH_QCHECKS:
+        // Perhaps we should order moves move here?  FIXME
         numOfMoves = generate_non_capture_checks(pos, moves, dc);
         movesPicked = 0;
         break;
@@ -299,26 +306,6 @@ void MovePicker::score_qcaptures() {
 }
 
 
-/// find_best_index() loops across the moves and returns index of
-/// the highest scored one.
-
-int MovePicker::find_best_index() const {
-
-  assert(movesPicked < numOfMoves);
-
-  int bestIndex = movesPicked;
-  int bestScore = moves[movesPicked].score;
-
-  for (int i = movesPicked + 1; i < numOfMoves; i++)
-      if (moves[i].score > bestScore)
-      {
-          bestIndex = i;
-          bestScore = moves[i].score;
-      }
-  return bestIndex;
-}
-
-
 /// MovePicker::pick_move_from_list() picks the move with the biggest score
 /// from a list of generated moves (moves[] or badCaptures[], depending on
 /// the current move generation phase).  It takes care not to return the
@@ -326,40 +313,17 @@ int MovePicker::find_best_index() const {
 
 Move MovePicker::pick_move_from_list() {
 
-  int bestIndex;
-  Move move;
+  assert(movesPicked >= 0);
+  assert(!pos.is_check() || PhaseTable[phaseIndex] == PH_EVASIONS || PhaseTable[phaseIndex] == PH_STOP);
+  assert( pos.is_check() || PhaseTable[phaseIndex] != PH_EVASIONS);
 
   switch (PhaseTable[phaseIndex]) {
 
   case PH_GOOD_CAPTURES:
-      assert(!pos.is_check());
-      assert(movesPicked >= 0);
-
-      while (movesPicked < numOfMoves)
-      {
-          bestIndex = find_best_index();
-          move = moves[bestIndex].move;
-          moves[bestIndex] = moves[movesPicked++];
-          if (   move != ttMove
-              && move != mateKiller
-              && pos.pl_move_is_legal(move, pinned))
-              return move;
-      }
-      break;
-
   case PH_NONCAPTURES:
-      assert(!pos.is_check());
-      assert(movesPicked >= 0);
-
       while (movesPicked < numOfMoves)
       {
-          // If this is a PV node or we have only picked a few moves, scan
-          // the entire move list for the best move.  If many moves have already
-          // been searched and it is not a PV node, we are probably failing low
-          // anyway, so we just pick the first move from the list.
-          bestIndex = (pvNode || movesPicked < 12) ? find_best_index() : movesPicked;
-          move = moves[bestIndex].move;
-          moves[bestIndex] = moves[movesPicked++];
+          Move move = moves[movesPicked++].move;
           if (   move != ttMove
               && move != mateKiller
               && pos.pl_move_is_legal(move, pinned))
@@ -368,26 +332,15 @@ Move MovePicker::pick_move_from_list() {
       break;
 
   case PH_EVASIONS:
-      assert(pos.is_check());
-      assert(movesPicked >= 0);
+      if (movesPicked < numOfMoves)
+          return moves[movesPicked++].move;
 
-      while (movesPicked < numOfMoves)
-      {
-          bestIndex = find_best_index();
-          move = moves[bestIndex].move;
-          moves[bestIndex] = moves[movesPicked++];
-          return move;
-    }
       break;
 
   case PH_BAD_CAPTURES:
-      assert(!pos.is_check());
-      assert(movesPicked >= 0);
-      // It's probably a good idea to use SEE move ordering here, instead
-      // of just picking the first move.  FIXME
       while (movesPicked < numOfBadCaptures)
       {
-          move = badCaptures[movesPicked++].move;
+          Move move = badCaptures[movesPicked++].move;
           if (   move != ttMove
               && move != mateKiller
               && pos.pl_move_is_legal(move, pinned))
@@ -396,28 +349,11 @@ Move MovePicker::pick_move_from_list() {
       break;
 
   case PH_QCAPTURES:
-      assert(!pos.is_check());
-      assert(movesPicked >= 0);
-      while (movesPicked < numOfMoves)
-      {
-          bestIndex = (movesPicked < 4 ? find_best_index() : movesPicked);
-          move = moves[bestIndex].move;
-          moves[bestIndex] = moves[movesPicked++];
-          // Maybe postpone the legality check until after futility pruning?
-          if (   move != ttMove
-              && pos.pl_move_is_legal(move, pinned))
-              return move;
-      }
-      break;
-
   case PH_QCHECKS:
-      assert(!pos.is_check());
-      assert(movesPicked >= 0);
-      // Perhaps we should do something better than just picking the first
-      // move here?  FIXME
       while (movesPicked < numOfMoves)
       {
-          move = moves[movesPicked++].move;
+          Move move = moves[movesPicked++].move;
+          // Maybe postpone the legality check until after futility pruning?
           if (   move != ttMove
               && pos.pl_move_is_legal(move, pinned))
               return move;

src/movepick.h

@@ -80,7 +80,6 @@ private:
   void score_evasions();
   void score_qcaptures();
   Move pick_move_from_list();
-  int find_best_index() const;
 
   const Position& pos;
   Move ttMove, mateKiller, killer1, killer2;

src/uci.cpp

@@ -251,11 +251,13 @@ namespace {
     if (token == "name")
     {
         uip >> name;
-        uip >> token;
-        while (!uip.eof() && token != "value")
+        while (!uip.eof())
         {
-          name += (" " + token);
             uip >> token;
+            if (token == "value")
+                break;
+
+            name += (" " + token);
         }
         if (token == "value")
         {