/*
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) 2008-2010 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
#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
////
//// 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).
struct CheckInfo {
- CheckInfo(const Position&);
+ explicit CheckInfo(const Position&);
- Square ksq;
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
+ CASTLES_NONE = 0,
+ WHITE_OO = 1,
+ BLACK_OO = 2,
+ WHITE_OOO = 4,
+ BLACK_OOO = 8,
+ ALL_CASTLES = 15
};
/// Game phase
struct StateInfo {
Key pawnKey, materialKey;
- int castleRights, rule50, pliesFromNull;
+ int castleRights, rule50, gamePly, pliesFromNull;
Square epSquare;
Score value;
Value npMaterial[2];
+ PieceType capturedType;
Key key;
- PieceType capture;
Bitboard checkersBB;
StateInfo* previous;
};
friend class MaterialInfo;
friend class EndgameFunctions;
+ Position(); // No default or copy c'tor allowed
+ Position(const Position& pos);
+
public:
enum GamePhase {
MidGame,
};
// Constructors
- Position() {}
- Position(const Position& pos);
- Position(const std::string& fen);
+ Position(const Position& pos, int threadID);
+ Position(const std::string& fen, int threadID);
// Text input/output
void from_fen(const std::string& fen);
void print(Move m = MOVE_NONE) const;
// Copying
- void copy(const Position& pos);
void flipped_copy(const Position& pos);
// The piece on a given square
// Information about attacks to or from a given square
Bitboard attackers_to(Square s) 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;
bool move_is_passed_pawn_push(Move m) const;
bool move_attacks_square(Move m, Square s) const;
+ // Piece captured with previous moves
+ PieceType captured_piece_type() const;
+
// Information about pawns
bool pawn_is_passed(Color c, Square s) const;
- static bool pawn_is_passed(Bitboard theirPawns, Color c, Square s);
- static bool pawn_is_isolated(Bitboard ourPawns, Square s);
- static bool pawn_is_doubled(Bitboard ourPawns, Color c, Square s);
// Weak squares
bool square_is_weak(Square s, Color c) const;
// Doing and undoing moves
- void saveState();
+ 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);
// 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;
// Incremental evaluation
Score value() const;
Value non_pawn_material(Color c) const;
- Score pst_delta(Piece piece, Square from, Square to) const;
+ static Score pst_delta(Piece piece, Square from, Square to);
// Game termination checks
bool is_mate() const;
bool is_draw() const;
- // Check if one side threatens a mate in one
- bool has_mate_threat(Color c);
+ // Check if side to move could be mated in one
+ bool has_mate_threat();
// Number of plies since the last non-reversible move
int rule_50_counter() const;
+ 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();
+ void inc_startpos_ply_counter();
+ int64_t nodes_searched() const;
+ void set_nodes_searched(int64_t n);
// Position consistency check, for debugging
bool is_ok(int* failedStep = NULL) const;
static void init_zobrist();
static void init_piece_square_tables();
- // Public zobs
- static Key zobExclusion;
-
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 do_allow_oo(Color c);
+ void do_allow_ooo(Color c);
+ bool set_castling_rights(char token);
// Helper functions for doing and undoing moves
- void do_capture_move(Bitboard& key, PieceType capture, Color them, Square to, bool ep);
+ 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();
Key compute_material_key() const;
// Computing incremental evaluation scores and material counts
- Score pst(Color c, PieceType pt, Square s) const;
+ static Score pst(Color c, PieceType pt, Square s);
Score compute_value() const;
Value compute_non_pawn_material(Color c) const;
// Other info
Color sideToMove;
- int gamePly;
Key history[MaxGameLength];
- File initialKFile, initialKRFile, initialQRFile;
+ int castleRightsMask[64];
StateInfo startState;
+ File initialKFile, initialKRFile, initialQRFile;
+ bool isChess960;
+ int startPosPlyCounter;
+ int threadID;
+ int64_t nodes;
StateInfo* st;
// Static variables
- static int castleRightsMask[64];
static Key zobrist[2][8][64];
static Key zobEp[64];
static Key zobCastle[16];
- static Key zobMaterial[2][8][16];
static Key zobSideToMove;
static Score PieceSquareTable[16][64];
+ static Key zobExclusion;
+ static const Value seeValues[8];
+ static const Value PieceValueMidgame[17];
+ static const Value PieceValueEndgame[17];
};
//// Inline functions
////
+inline int64_t Position::nodes_searched() const {
+ return nodes;
+}
+
+inline void Position::set_nodes_searched(int64_t n) {
+ nodes = n;
+}
+
inline Piece Position::piece_on(Square s) const {
return board[s];
}
}
inline bool Position::square_is_empty(Square s) const {
- return piece_on(s) == EMPTY;
+ return piece_on(s) == PIECE_NONE;
}
inline bool Position::square_is_occupied(Square s) const {
}
inline Value Position::midgame_value_of_piece_on(Square s) const {
- return piece_value_midgame(piece_on(s));
+ return PieceValueMidgame[piece_on(s)];
}
inline Value Position::endgame_value_of_piece_on(Square s) const {
- return piece_value_endgame(piece_on(s));
+ return PieceValueEndgame[piece_on(s)];
}
inline Color Position::side_to_move() const {
}
inline Bitboard Position::empty_squares() const {
- return ~(occupied_squares());
+ return ~occupied_squares();
}
inline Bitboard Position::pieces_of_color(Color c) const {
return pieceCount[c][pt];
}
-inline Square Position::piece_list(Color c, PieceType pt, int index) const {
- return pieceList[c][pt][index];
+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 {
return !(pieces(PAWN, opposite_color(c)) & passed_pawn_mask(c, s));
}
-inline bool Position::pawn_is_passed(Bitboard theirPawns, Color c, Square s) {
- return !(theirPawns & passed_pawn_mask(c, s));
-}
-
-inline bool Position::pawn_is_isolated(Bitboard ourPawns, Square s) {
- return !(ourPawns & neighboring_files_bb(s));
-}
-
-inline bool Position::pawn_is_doubled(Bitboard ourPawns, Color c, Square s) {
- return ourPawns & squares_behind(c, s);
-}
-
inline bool Position::square_is_weak(Square s, Color c) const {
- return !(pieces(PAWN, c) & outpost_mask(opposite_color(c), s));
+ return !(pieces(PAWN, opposite_color(c)) & attack_span_mask(c, s));
}
inline Key Position::get_key() const {
return st->key;
}
+inline Key Position::get_exclusion_key() const {
+ return st->key ^ zobExclusion;
+}
+
inline Key Position::get_pawn_key() const {
return st->pawnKey;
}
return st->materialKey;
}
-inline Score Position::pst(Color c, PieceType pt, Square s) const {
+inline Score Position::pst(Color c, PieceType pt, Square s) {
return PieceSquareTable[piece_of_color_and_type(c, pt)][s];
}
-inline Score Position::pst_delta(Piece piece, Square from, Square to) const {
+inline Score Position::pst_delta(Piece piece, Square from, Square to) {
return PieceSquareTable[piece][to] - PieceSquareTable[piece][from];
}
}
inline int Position::rule_50_counter() const {
-
return st->rule50;
}
+inline int Position::startpos_ply_counter() const {
+ return startPosPlyCounter;
+}
+
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));
+ && !same_color_squares(piece_list(WHITE, BISHOP, 0), piece_list(BLACK, BISHOP, 0));
}
inline bool Position::has_pawn_on_7th(Color c) const {
-
return pieces(PAWN, c) & relative_rank_bb(c, RANK_7);
}
+inline bool Position::is_chess960() const {
+ return isChess960;
+}
+
inline bool Position::move_is_capture(Move m) const {
// Move must not be MOVE_NONE !
return (m & (0x1F << 12)) ? !move_is_castle(m) : !square_is_empty(move_to(m));
}
+inline PieceType Position::captured_piece_type() const {
+ return st->capturedType;
+}
+
+inline int Position::thread() const {
+ return threadID;
+}
+
+inline void Position::do_allow_oo(Color c) {
+ st->castleRights |= (1 + int(c));
+}
+
+inline void Position::do_allow_ooo(Color c) {
+ st->castleRights |= (4 + 4*int(c));
+}
+
#endif // !defined(POSITION_H_INCLUDED)