/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2009 Marco Costalba
+ 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
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 "lock.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
-/// 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.
-/// 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.
+/// MovePicker class is used to pick one pseudo legal move at a time from the
+/// current position. The most important method is 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 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);
- Move get_next_move();
- Move get_next_move(Lock& lock);
- int number_of_evasions() const;
+ MovePicker(const Position&, Move, Depth, const History&, Search::Stack*, Value);
+ MovePicker(const Position&, Move, Depth, const History&, Square);
+ MovePicker(const Position&, Move, const History&, PieceType);
+ Move next_move();
private:
void score_captures();
void score_noncaptures();
void score_evasions();
- void go_next_phase();
+ void generate_next();
const Position& pos;
const History& H;
- MoveStack ttMoves[2], killers[2];
- int phase;
- const uint8_t* phasePtr;
- MoveStack *curMove, *lastMove, *lastBadCapture;
- Bitboard pinned;
- MoveStack moves[256], badCaptures[64];
+ Depth depth;
+ Move ttMove;
+ MoveStack killers[2];
+ Square recaptureSquare;
+ int captureThreshold, phase;
+ MoveStack *curMove, *lastMove, *lastQuiet, *lastBadCapture;
+ 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)