X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fposition.h;h=8b81358769854354b0fc07ad828711ebf0518378;hp=e67dfbd49e165fb295af33d5691062cbdb0a5038;hb=7e95495b35ef84a87fa6be34639a5f96e67972b0;hpb=2aac860db3d04881103a3b0d09e864ac77b80697 diff --git a/src/position.h b/src/position.h index e67dfbd4..8b813587 100644 --- a/src/position.h +++ b/src/position.h @@ -1,7 +1,7 @@ /* Stockfish, a UCI chess playing engine derived from Glaurung 2.1 Copyright (C) 2004-2008 Tord Romstad (Glaurung author) - Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad + Copyright (C) 2008-2013 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 @@ -21,6 +21,7 @@ #define POSITION_H_INCLUDED #include +#include #include "bitboard.h" #include "types.h" @@ -29,7 +30,7 @@ /// The checkInfo struct is initialized at c'tor time and keeps info used /// to detect if a move gives check. class Position; -class Thread; +struct Thread; struct CheckInfo { @@ -37,19 +38,19 @@ struct CheckInfo { Bitboard dcCandidates; Bitboard pinned; - Bitboard checkSq[8]; + Bitboard checkSq[PIECE_TYPE_NB]; Square ksq; }; /// The StateInfo struct stores information we need to restore a Position /// object to its previous state when we retract a move. Whenever a move -/// is made on the board (by calling Position::do_move), an StateInfo object +/// is made on the board (by calling Position::do_move), a StateInfo object /// must be passed as a parameter. struct StateInfo { Key pawnKey, materialKey; - Value npMaterial[2]; + Value npMaterial[COLOR_NB]; int castleRights, rule50, pliesFromNull; Score psqScore; Square epSquare; @@ -61,6 +62,11 @@ struct StateInfo { }; +/// When making a move the current StateInfo up to 'key' excluded is copied to +/// the new one. Here we calculate the quad words (64bits) needed to be copied. +const size_t StateCopySize64 = offsetof(StateInfo, key) / sizeof(uint64_t) + 1; + + /// The position data structure. A position consists of the following data: /// /// * For each piece type, a bitboard representing the squares occupied @@ -86,27 +92,26 @@ struct StateInfo { class Position { public: Position() {} - Position(const Position& p) { *this = p; } Position(const Position& p, Thread* t) { *this = p; thisThread = t; } - Position(const std::string& f, bool c960, Thread* t) { from_fen(f, c960, t); } - void operator=(const Position&); + Position(const std::string& f, bool c960, Thread* t) { set(f, c960, t); } + Position& operator=(const Position&); // Text input/output - void from_fen(const std::string& fen, bool isChess960, Thread* th); - const std::string to_fen() const; - void print(Move m = MOVE_NONE) const; + void set(const std::string& fen, bool isChess960, Thread* th); + const std::string fen() const; + const std::string pretty(Move m = MOVE_NONE) const; // Position representation Bitboard pieces() const; - Bitboard pieces(Color c) const; Bitboard pieces(PieceType pt) const; - Bitboard pieces(PieceType pt, Color c) const; Bitboard pieces(PieceType pt1, PieceType pt2) const; - Bitboard pieces(PieceType pt1, PieceType pt2, Color c) const; + Bitboard pieces(Color c) const; + Bitboard pieces(Color c, PieceType pt) const; + Bitboard pieces(Color c, PieceType pt1, PieceType pt2) const; Piece piece_on(Square s) const; Square king_square(Color c) const; Square ep_square() const; - bool square_empty(Square s) const; + bool is_empty(Square s) const; const Square* piece_list(Color c, PieceType pt) const; int piece_count(Color c, PieceType pt) const; @@ -117,7 +122,6 @@ public: Square castle_rook_square(Color c, CastlingSide s) const; // Checking - bool in_check() const; Bitboard checkers() const; Bitboard discovered_check_candidates() const; Bitboard pinned_pieces() const; @@ -132,7 +136,6 @@ public: // Properties of moves bool move_gives_check(Move m, const CheckInfo& ci) const; - bool move_attacks_square(Move m, Square s) const; bool pl_move_is_legal(Move m, Bitboard pinned) const; bool is_pseudo_legal(const Move m) const; bool is_capture(Move m) const; @@ -151,10 +154,11 @@ public: void do_move(Move m, StateInfo& st); void do_move(Move m, StateInfo& st, const CheckInfo& ci, bool moveIsCheck); void undo_move(Move m); - template void do_null_move(StateInfo& st); + void do_null_move(StateInfo& st); + void undo_null_move(); // Static exchange evaluation - int see(Move m) const; + int see(Move m, int asymmThreshold = 0) const; int see_sign(Move m) const; // Accessing hash keys @@ -165,34 +169,29 @@ public: // Incremental piece-square evaluation Score psq_score() const; - Score psq_delta(Piece p, Square from, Square to) const; Value non_pawn_material(Color c) const; // Other properties of the position Color side_to_move() const; - int startpos_ply_counter() const; + int game_ply() const; bool is_chess960() const; Thread* this_thread() const; int64_t nodes_searched() const; void set_nodes_searched(int64_t n); - template bool is_draw() const; + bool is_draw() const; // Position consistency check, for debugging bool pos_is_ok(int* failedStep = NULL) const; void flip(); - // Global initialization - static void init(); - private: // Initialization helpers (used while setting up a position) void clear(); void put_piece(Piece p, Square s); void set_castle_right(Color c, Square rfrom); - bool move_is_legal(const Move m) const; - // Helper template functions - template void do_castle_move(Move m); + // Helper functions + void do_castle(Square kfrom, Square kto, Square rfrom, Square rto); template Bitboard hidden_checkers() const; // Computing hash keys from scratch (for initialization and debugging) @@ -205,32 +204,24 @@ private: Value compute_non_pawn_material(Color c) const; // Board and pieces - Piece board[64]; // [square] - Bitboard byTypeBB[8]; // [pieceType] - Bitboard byColorBB[2]; // [color] - int pieceCount[2][8]; // [color][pieceType] - Square pieceList[2][8][16]; // [color][pieceType][index] - int index[64]; // [square] + Piece board[SQUARE_NB]; + Bitboard byTypeBB[PIECE_TYPE_NB]; + Bitboard byColorBB[COLOR_NB]; + int pieceCount[COLOR_NB][PIECE_TYPE_NB]; + Square pieceList[COLOR_NB][PIECE_TYPE_NB][16]; + int index[SQUARE_NB]; // Other info - int castleRightsMask[64]; // [square] - Square castleRookSquare[2][2]; // [color][side] - Bitboard castlePath[2][2]; // [color][side] + int castleRightsMask[SQUARE_NB]; + Square castleRookSquare[COLOR_NB][CASTLING_SIDE_NB]; + Bitboard castlePath[COLOR_NB][CASTLING_SIDE_NB]; StateInfo startState; int64_t nodes; - int startPosPly; + int gamePly; Color sideToMove; Thread* thisThread; StateInfo* st; int chess960; - - // Static variables - static Score pieceSquareTable[16][64]; // [piece][square] - static Key zobrist[2][8][64]; // [color][pieceType][square]/[piece count] - static Key zobEp[8]; // [file] - static Key zobCastle[16]; // [castleRight] - static Key zobSideToMove; - static Key zobExclusion; }; inline int64_t Position::nodes_searched() const { @@ -249,7 +240,7 @@ inline Piece Position::piece_moved(Move m) const { return board[from_sq(m)]; } -inline bool Position::square_empty(Square s) const { +inline bool Position::is_empty(Square s) const { return board[s] == NO_PIECE; } @@ -261,24 +252,24 @@ inline Bitboard Position::pieces() const { return byTypeBB[ALL_PIECES]; } -inline Bitboard Position::pieces(Color c) const { - return byColorBB[c]; -} - inline Bitboard Position::pieces(PieceType pt) const { return byTypeBB[pt]; } -inline Bitboard Position::pieces(PieceType pt, Color c) const { - return byTypeBB[pt] & byColorBB[c]; -} - inline Bitboard Position::pieces(PieceType pt1, PieceType pt2) const { return byTypeBB[pt1] | byTypeBB[pt2]; } -inline Bitboard Position::pieces(PieceType pt1, PieceType pt2, Color c) const { - return (byTypeBB[pt1] | byTypeBB[pt2]) & byColorBB[c]; +inline Bitboard Position::pieces(Color c) const { + return byColorBB[c]; +} + +inline Bitboard Position::pieces(Color c, PieceType pt) const { + return byColorBB[c] & byTypeBB[pt]; +} + +inline Bitboard Position::pieces(Color c, PieceType pt1, PieceType pt2) const { + return byColorBB[c] & (byTypeBB[pt1] | byTypeBB[pt2]); } inline int Position::piece_count(Color c, PieceType pt) const { @@ -302,7 +293,7 @@ inline int Position::can_castle(CastleRight f) const { } inline int Position::can_castle(Color c) const { - return st->castleRights & ((WHITE_OO | WHITE_OOO) << c); + return st->castleRights & ((WHITE_OO | WHITE_OOO) << (2 * c)); } inline bool Position::castle_impeded(Color c, CastlingSide s) const { @@ -338,10 +329,6 @@ inline Bitboard Position::checkers() const { return st->checkersBB; } -inline bool Position::in_check() const { - return st->checkersBB != 0; -} - inline Bitboard Position::discovered_check_candidates() const { return hidden_checkers(); } @@ -351,7 +338,7 @@ inline Bitboard Position::pinned_pieces() const { } inline bool Position::pawn_is_passed(Color c, Square s) const { - return !(pieces(PAWN, ~c) & passed_pawn_mask(c, s)); + return !(pieces(~c, PAWN) & passed_pawn_mask(c, s)); } inline Key Position::key() const { @@ -359,7 +346,7 @@ inline Key Position::key() const { } inline Key Position::exclusion_key() const { - return st->key ^ zobExclusion; + return st->key ^ Zobrist::exclusion; } inline Key Position::pawn_key() const { @@ -370,10 +357,6 @@ inline Key Position::material_key() const { return st->materialKey; } -inline Score Position::psq_delta(Piece p, Square from, Square to) const { - return pieceSquareTable[p][to] - pieceSquareTable[p][from]; -} - inline Score Position::psq_score() const { return st->psqScore; } @@ -388,8 +371,8 @@ inline bool Position::is_passed_pawn_push(Move m) const { && pawn_is_passed(sideToMove, to_sq(m)); } -inline int Position::startpos_ply_counter() const { - return startPosPly + st->pliesFromNull; // HACK +inline int Position::game_ply() const { + return gamePly; } inline bool Position::opposite_bishops() const { @@ -406,7 +389,7 @@ inline bool Position::bishop_pair(Color c) const { } inline bool Position::pawn_on_7th(Color c) const { - return pieces(PAWN, c) & rank_bb(relative_rank(c, RANK_7)); + return pieces(c, PAWN) & rank_bb(relative_rank(c, RANK_7)); } inline bool Position::is_chess960() const { @@ -416,14 +399,14 @@ inline bool Position::is_chess960() const { inline bool Position::is_capture_or_promotion(Move m) const { assert(is_ok(m)); - return is_special(m) ? !is_castle(m) : !square_empty(to_sq(m)); + return type_of(m) ? type_of(m) != CASTLE : !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_empty(to_sq(m)) && !is_castle(m)) || is_enpassant(m); + return (!is_empty(to_sq(m)) && type_of(m) != CASTLE) || type_of(m) == ENPASSANT; } inline PieceType Position::captured_piece_type() const {