X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fposition.h;h=e3fa28d17d0f4074087ee519c3ea05237d403c53;hp=676f68ef06136a9ec9ee2cecd55396cd84ea300a;hb=cb506d3b1657c03738f823a98faed3c6b5216c40;hpb=55f9afee2a079b2dd0b1aeda41082c58eb317ca3 diff --git a/src/position.h b/src/position.h index 676f68ef..e3fa28d1 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 Marco Costalba + Copyright (C) 2008-2009 Marco Costalba Stockfish is free software: you can redistribute it and/or modify it under the terms of the GNU General Public License as published by @@ -21,12 +21,16 @@ #if !defined(POSITION_H_INCLUDED) #define POSITION_H_INCLUDED -// Disable a silly and noisy warning from MSVC compiler +// 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 //// @@ -38,7 +42,6 @@ #include "direction.h" #include "move.h" #include "piece.h" -#include "phase.h" #include "square.h" #include "value.h" @@ -47,13 +50,12 @@ //// Constants //// -/// FEN string for the initial position: -const std::string StartPosition = - "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"; +/// 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): +/// move counter for every non-reversible move). const int MaxGameLength = 220; @@ -61,17 +63,23 @@ const int MaxGameLength = 220; //// Types //// -/// Castle rights, encoded as bit fields: +/// Castle rights, encoded as bit fields enum CastleRights { - NO_CASTLES = 0, - WHITE_OO = 1, - BLACK_OO = 2, - WHITE_OOO = 4, - BLACK_OOO = 8, + NO_CASTLES = 0, + WHITE_OO = 1, + BLACK_OO = 2, + WHITE_OOO = 4, + BLACK_OOO = 8, ALL_CASTLES = 15 }; +/// Game phase +enum Phase { + PHASE_ENDGAME = 0, + PHASE_MIDGAME = 128 +}; + /// The StateInfo struct stores information we need to restore a Position /// object to its previous state when we retract a move. Whenever a move @@ -79,37 +87,37 @@ enum CastleRights { /// must be passed as a parameter. struct StateInfo { - Bitboard pinners[2], pinned[2], dcCandidates[2], checkersBB; Key key, pawnKey, materialKey; int castleRights, rule50; Square epSquare; Value mgValue, egValue; + Value npMaterial[2]; + PieceType capture; + Bitboard checkersBB; StateInfo* previous; - Move lastMove; }; -/// The position data structure. A position consists of the following data: +/// The position data structure. A position consists of the following data: /// /// * For each piece type, a bitboard representing the squares occupied /// by pieces of that type. -/// * For each color, a bitboard representing the squares occupiecd by +/// * For each color, a bitboard representing the squares occupied by /// pieces of that color. /// * A bitboard of all occupied squares. /// * A bitboard of all checking pieces. /// * A 64-entry array of pieces, indexed by the squares of the board. /// * The current side to move. /// * Information about the castling rights for both sides. -/// * The initial files of the kings and both pairs of rooks. This is +/// * The initial files of the kings and both pairs of rooks. This is /// used to implement the Chess960 castling rules. /// * The en passant square (which is SQ_NONE if no en passant capture is /// possible). /// * The squares of the kings for both sides. -/// * The last move played. /// * Hash keys for the position itself, the current pawn structure, and /// the current material situation. -/// * Hash keys for all previous positions in the game (for detecting +/// * Hash keys for all previous positions in the game for detecting /// repetition draws. /// * A counter for detecting 50 move rule draws. @@ -119,6 +127,11 @@ class Position { friend class EndgameFunctions; public: + enum GamePhase { + MidGame, + EndGame + }; + // Constructors Position() {}; Position(const Position& pos); @@ -130,8 +143,8 @@ public: void print(Move m = MOVE_NONE) const; // Copying - void copy(const Position &pos); - void flipped_copy(const Position &pos); + void copy(const Position& pos); + void flipped_copy(const Position& pos); // The piece on a given square Piece piece_on(Square s) const; @@ -219,7 +232,9 @@ public: // Properties of moves bool pl_move_is_legal(Move m) const; + bool pl_move_is_legal(Move m, Bitboard pinned) const; bool move_is_check(Move m) const; + bool move_is_check(Move m, Bitboard dcCandidates) const; bool move_is_capture(Move m) const; bool move_is_deep_pawn_push(Move m) const; bool move_is_pawn_push_to_7th(Move m) const; @@ -229,19 +244,17 @@ public: // Information about pawns bool pawn_is_passed(Color c, Square s) const; - bool pawn_is_isolated(Color c, Square s) const; - bool pawn_is_doubled(Color c, Square s) const; - - // Open and half-open files - bool file_is_open(File f) const; - bool file_is_half_open(Color c, File f) 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 setStartState(const StateInfo& st); + void saveState(); void do_move(Move m, StateInfo& st); + void do_move(Move m, StateInfo& st, Bitboard dcCandidates); void undo_move(Move m); void do_null_move(StateInfo& st); void undo_null_move(); @@ -250,6 +263,7 @@ public: 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; @@ -261,7 +275,7 @@ public: Value eg_value() const; Value non_pawn_material(Color c) const; Phase game_phase() const; - Value mg_pst_delta(Move m) const; + template Value pst_delta(Piece piece, Square from, Square to) const; // Game termination checks bool is_mate() const; @@ -288,6 +302,7 @@ public: static void init_piece_square_tables(); private: + // Initialization helper functions (used while setting up a position) void clear(); void put_piece(Piece p, Square s); @@ -295,22 +310,19 @@ private: void allow_ooo(Color c); // Helper functions for doing and undoing moves - void init_new_state(StateInfo& newSt); - void do_capture_move(Move m, PieceType capture, Color them, Square to); + void do_capture_move(PieceType capture, Color them, Square to, bool ep); void do_castle_move(Move m); void do_promotion_move(Move m); - void do_ep_move(Move m); void undo_castle_move(Move m); void undo_promotion_move(Move m); void undo_ep_move(Move m); void find_checkers(); - void find_pinned(); template void update_checkers(Bitboard* pCheckersBB, Square ksq, Square from, Square to, Bitboard dcCandidates); - template - Bitboard hidden_checks(Color c, Square ksq, Bitboard& pinners) const; + template + Bitboard hidden_checkers(Color c) const; // Computing hash keys from scratch (for initialization and debugging) Key compute_key() const; @@ -318,10 +330,6 @@ private: Key compute_material_key() const; // Computing incremental evaluation scores and material counts - enum GamePhase { - MidGame, - EndGame - }; template Value pst(Color c, PieceType pt, Square s) const; template Value compute_value() const; Value compute_non_pawn_material(Color c) const; @@ -344,7 +352,6 @@ private: Color sideToMove; int gamePly; Key history[MaxGameLength]; - Value npMaterial[2]; File initialKFile, initialKRFile, initialQRFile; StateInfo startState; StateInfo* st; @@ -485,10 +492,6 @@ inline Bitboard Position::bishops_and_queens(Color c) const { return bishops_and_queens() & pieces_of_color(c); } -inline Bitboard Position::sliders_of_color(Color c) const { - return sliders() & pieces_of_color(c); -} - inline int Position::piece_count(Color c, PieceType pt) const { return pieceCount[c][pt]; } @@ -529,14 +532,14 @@ inline Bitboard Position::pawn_attacks(Color c, Square s) const { return StepAttackBB[piece_of_color_and_type(c, PAWN)][s]; } -template<> -inline Bitboard Position::piece_attacks(Square s) const { - return StepAttackBB[piece_of_color_and_type(opposite_color(sideToMove), PAWN)][s]; +template // Knight and King +inline Bitboard Position::piece_attacks(Square s) const { + return StepAttackBB[Piece][s]; } template<> -inline Bitboard Position::piece_attacks(Square s) const { - return StepAttackBB[KNIGHT][s]; +inline Bitboard Position::piece_attacks(Square s) const { + return StepAttackBB[piece_of_color_and_type(opposite_color(sideToMove), PAWN)][s]; } template<> @@ -554,24 +557,6 @@ inline Bitboard Position::piece_attacks(Square s) const { return piece_attacks(s) | piece_attacks(s); } -template<> -inline Bitboard Position::piece_attacks(Square s) const { - return StepAttackBB[KING][s]; -} - -inline Bitboard Position::pinned_pieces(Color c) const { - return st->pinned[c]; -} - -inline Bitboard Position::pinned_pieces(Color c, Bitboard& p) const { - p = st->pinners[c]; - return st->pinned[c]; -} - -inline Bitboard Position::discovered_check_candidates(Color c) const { - return st->dcCandidates[c]; -} - inline Bitboard Position::checkers() const { return st->checkersBB; } @@ -603,20 +588,16 @@ inline bool Position::pawn_is_passed(Color c, Square s) const { return !(pawns(opposite_color(c)) & passed_pawn_mask(c, s)); } -inline bool Position::pawn_is_isolated(Color c, Square s) const { - return !(pawns(c) & neighboring_files_bb(s)); -} - -inline bool Position::pawn_is_doubled(Color c, Square s) const { - return pawns(c) & squares_behind(c, s); +inline bool Position::pawn_is_passed(Bitboard theirPawns, Color c, Square s) { + return !(theirPawns & passed_pawn_mask(c, s)); } -inline bool Position::file_is_open(File f) const { - return !(pawns() & file_bb(f)); +inline bool Position::pawn_is_isolated(Bitboard ourPawns, Square s) { + return !(ourPawns & neighboring_files_bb(s)); } -inline bool Position::file_is_half_open(Color c, File f) const { - return !(pawns(c) & file_bb(f)); +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 { @@ -635,15 +616,16 @@ inline Key Position::get_material_key() const { return st->materialKey; } -template +template inline Value Position::pst(Color c, PieceType pt, Square s) const { - return (Phase == MidGame ? MgPieceSquareTable[piece_of_color_and_type(c, pt)][s] - : EgPieceSquareTable[piece_of_color_and_type(c, pt)][s]); + return (Ph == MidGame ? MgPieceSquareTable[piece_of_color_and_type(c, pt)][s] + : EgPieceSquareTable[piece_of_color_and_type(c, pt)][s]); } -inline Value Position::mg_pst_delta(Move m) const { - return MgPieceSquareTable[piece_on(move_from(m))][move_to(m)] - -MgPieceSquareTable[piece_on(move_from(m))][move_from(m)]; +template +inline Value Position::pst_delta(Piece piece, Square from, Square to) const { + return (Ph == MidGame ? MgPieceSquareTable[piece][to] - MgPieceSquareTable[piece][from] + : EgPieceSquareTable[piece][to] - EgPieceSquareTable[piece][from]); } inline Value Position::mg_value() const { @@ -655,20 +637,14 @@ inline Value Position::eg_value() const { } inline Value Position::non_pawn_material(Color c) const { - return npMaterial[c]; + return st->npMaterial[c]; } inline Phase Position::game_phase() const { - // The purpose of the Value(325) terms below is to make sure the difference - // between MidgameLimit and EndgameLimit is a power of 2, which should make - // the division at the end of the function a bit faster. - static const Value MidgameLimit = 2 * QueenValueMidgame - + 2 * RookValueMidgame - + 6 * BishopValueMidgame - + Value(325); - - static const Value EndgameLimit = 4 * RookValueMidgame - Value(325); + // Values modified by Joona Kiiski + static const Value MidgameLimit = Value(15581); + static const Value EndgameLimit = Value(3998); Value npm = non_pawn_material(WHITE) + non_pawn_material(BLACK); @@ -725,5 +701,11 @@ inline bool Position::has_pawn_on_7th(Color c) const { return pawns(c) & relative_rank_bb(c, RANK_7); } +inline bool Position::move_is_capture(Move m) const { + + // Move must not be MOVE_NONE ! + + return (!square_is_empty(move_to(m)) && !move_is_castle(m)) || move_is_ep(m); +} #endif // !defined(POSITION_H_INCLUDED)