/*
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
Bitboard dcCandidates;
Bitboard pinned;
Bitboard checkSq[8];
+ Square ksq;
};
// The piece on a given square
Piece piece_on(Square s) const;
+ Piece piece_moved(Move m) const;
bool square_is_empty(Square s) const;
// Side to move
Color side_to_move() const;
// Bitboard representation of the position
- Bitboard empty_squares() const;
Bitboard occupied_squares() const;
Bitboard pieces(Color c) const;
Bitboard pieces(PieceType pt) const;
// Castling rights
bool can_castle(CastleRight f) const;
bool can_castle(Color c) const;
+ bool castle_impeded(CastleRight f) const;
Square castle_rook_square(CastleRight f) const;
// Bitboards for pinned pieces and discovered check candidates
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;
Value non_pawn_material(Color c) const;
Score pst_delta(Piece piece, Square from, Square to) const;
- // Game termination checks
- bool is_mate() const;
+ // Other properties of the position
template<bool SkipRepetition> bool is_draw() 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 both_color_bishops(Color c) const;
bool has_pawn_on_7th(Color c) const;
bool is_chess960() const;
-
- // Current thread ID searching on the position
int thread() const;
-
int64_t nodes_searched() const;
void set_nodes_searched(int64_t n);
// Initialization helper functions (used while setting up a position)
void clear();
void put_piece(Piece p, Square s);
- void set_castle_right(Square ksq, Square rsq);
+ void set_castle_right(Color c, Square rfrom);
bool move_is_legal(const Move m) const;
// Helper template functions
// Other info
int castleRightsMask[64]; // [square]
Square castleRookSquare[16]; // [castleRight]
+ Bitboard castlePath[16]; // [castleRight]
StateInfo startState;
int64_t nodes;
int startPosPly;
// Static variables
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 zobEp[8]; // [file]
static Key zobCastle[16]; // [castleRight]
static Key zobSideToMove;
static Key zobExclusion;
return board[s];
}
+inline Piece Position::piece_moved(Move m) const {
+ return board[from_sq(m)];
+}
+
inline bool Position::square_is_empty(Square s) const {
- return board[s] == PIECE_NONE;
+ return board[s] == NO_PIECE;
}
inline Color Position::side_to_move() const {
return occupied;
}
-inline Bitboard Position::empty_squares() const {
- return ~occupied;
-}
-
inline Bitboard Position::pieces(Color c) const {
return byColorBB[c];
}
return st->castleRights & ((WHITE_OO | WHITE_OOO) << c);
}
-inline Square Position::castle_rook_square(CastleRight f) const {
- return castleRookSquare[f];
+inline bool Position::castle_impeded(CastleRight f) const {
+ return occupied & castlePath[f];
}
-template<>
-inline Bitboard Position::attacks_from<PAWN>(Square s, Color c) const {
- return StepAttacksBB[make_piece(c, PAWN)][s];
+inline Square Position::castle_rook_square(CastleRight f) const {
+ return castleRookSquare[f];
}
-template<PieceType Piece> // Knight and King and white pawns
+template<PieceType Pt>
inline Bitboard Position::attacks_from(Square s) const {
- return StepAttacksBB[Piece][s];
+ return Pt == BISHOP || Pt == ROOK ? attacks_bb<Pt>(s, occupied_squares())
+ : Pt == QUEEN ? attacks_from<ROOK>(s) | attacks_from<BISHOP>(s)
+ : StepAttacksBB[Pt][s];
}
template<>
-inline Bitboard Position::attacks_from<BISHOP>(Square s) const {
- return bishop_attacks_bb(s, occupied_squares());
-}
-
-template<>
-inline Bitboard Position::attacks_from<ROOK>(Square s) const {
- return rook_attacks_bb(s, occupied_squares());
-}
-
-template<>
-inline Bitboard Position::attacks_from<QUEEN>(Square s) const {
- return attacks_from<ROOK>(s) | attacks_from<BISHOP>(s);
+inline Bitboard Position::attacks_from<PAWN>(Square s, Color c) const {
+ return StepAttacksBB[make_piece(c, PAWN)][s];
}
inline Bitboard Position::attacks_from(Piece p, Square s) const {
- return attacks_from(p, s, occupied_squares());
+ return attacks_from(p, s, occupied);
}
inline Bitboard Position::attackers_to(Square s) const {
- return attackers_to(s, occupied_squares());
+ return attackers_to(s, occupied);
}
inline Bitboard Position::checkers() const {
}
inline bool Position::pawn_is_passed(Color c, Square s) const {
- return !(pieces(PAWN, flip(c)) & passed_pawn_mask(c, s));
+ return !(pieces(PAWN, ~c) & passed_pawn_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 bool Position::is_passed_pawn_push(Move m) const {
- return board[move_from(m)] == make_piece(sideToMove, PAWN)
- && pawn_is_passed(sideToMove, move_to(m));
+ return board[from_sq(m)] == make_piece(sideToMove, PAWN)
+ && pawn_is_passed(sideToMove, to_sq(m));
}
inline int Position::startpos_ply_counter() const {
&& opposite_colors(pieceList[WHITE][BISHOP][0], pieceList[BLACK][BISHOP][0]);
}
+inline bool Position::both_color_bishops(Color c) const {
+ // Assumes that there are only two bishops
+ return pieceCount[c][BISHOP] >= 2 &&
+ opposite_colors(pieceList[c][BISHOP][0], pieceList[c][BISHOP][1]);
+}
+
inline bool Position::has_pawn_on_7th(Color c) const {
return pieces(PAWN, c) & rank_bb(relative_rank(c, RANK_7));
}
inline bool Position::is_capture_or_promotion(Move m) const {
assert(is_ok(m));
- return is_special(m) ? !is_castle(m) : !square_is_empty(move_to(m));
+ return is_special(m) ? !is_castle(m) : !square_is_empty(to_sq(m));
}
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(move_to(m)) && !is_castle(m)) || is_enpassant(m);
+ return (!square_is_empty(to_sq(m)) && !is_castle(m)) || is_enpassant(m);
}
inline PieceType Position::captured_piece_type() const {
projects / stockfish / blobdiff