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66d5c13a88
Use the same scoring system used for evasions. Small if any increase, but should be in at least for completeness. After 999 games at 1+0 Mod vs Orig +208 =601 -190 +6 ELO Signed-off-by: Marco Costalba <mcostalba@gmail.com>
90 lines
2.6 KiB
C++
90 lines
2.6 KiB
C++
/*
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Stockfish, a UCI chess playing engine derived from Glaurung 2.1
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Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
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Copyright (C) 2008-2009 Marco Costalba
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Stockfish is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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Stockfish is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#if !defined MOVEPICK_H_INCLUDED
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#define MOVEPICK_H_INCLUDED
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////
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//// Includes
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////
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#include "depth.h"
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#include "history.h"
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#include "lock.h"
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#include "position.h"
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////
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//// Types
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////
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struct SearchStack;
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/// MovePicker is a class which is used to pick one legal move at a time from
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/// the current position. It is initialized with a Position object and a few
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/// moves we have reason to believe are good. The most important method is
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/// MovePicker::pick_next_move(), which returns a new legal move each time it
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/// is called, until there are no legal moves left, when MOVE_NONE is returned.
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/// In order to improve the efficiency of the alpha beta algorithm, MovePicker
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/// attempts to return the moves which are most likely to be strongest first.
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class MovePicker {
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MovePicker& operator=(const MovePicker&); // silence a warning under MSVC
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public:
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MovePicker(const Position& p, Move ttm, Depth d, const History& h, SearchStack* ss = NULL);
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Move get_next_move();
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Move get_next_move(Lock& lock);
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int number_of_evasions() const;
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private:
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void score_captures();
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void score_noncaptures();
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void score_evasions_or_checks();
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void go_next_phase();
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const Position& pos;
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const History& H;
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MoveStack ttMoves[2], killers[2];
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int phase;
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const uint8_t* phasePtr;
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MoveStack *curMove, *lastMove, *lastBadCapture;
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Bitboard pinned;
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MoveStack moves[256], badCaptures[64];
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};
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////
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//// Inline functions
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////
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/// MovePicker::number_of_evasions() simply returns the number of moves in
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/// evasions phase. It is intended to be used in positions where the side to
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/// move is in check, for detecting checkmates or situations where there is
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/// only a single reply to check.
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/// WARNING: It works as long as PH_EVASIONS is the _only_ phase for evasions.
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inline int MovePicker::number_of_evasions() const {
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return int(lastMove - moves);
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}
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#endif // !defined(MOVEPICK_H_INCLUDED)
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