X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fposition.h;h=56f5546936650d751db0e14f081120ac49b6b9e2;hp=71f821b2b3183144849d200242b4250743d71f57;hb=b21a5e2f0638a55daeaa98ba95afc6c016ea0b6e;hpb=b638f6b0354ea124dc80e5e38189474d34141e2d diff --git a/src/position.h b/src/position.h index 71f821b2..56f55469 100644 --- a/src/position.h +++ b/src/position.h @@ -17,73 +17,43 @@ along with this program. If not, see . */ - #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 -//// +#include #include "bitboard.h" -#include "color.h" -#include "direction.h" #include "move.h" -#include "piece.h" -#include "square.h" -#include "value.h" - - -//// -//// Constants -//// - -/// FEN string for the initial position -const std::string StartPosition = "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"; +#include "types.h" /// 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). const int MaxGameLength = 220; - -//// -//// Types -//// +class Position; /// struct checkInfo is initialized at c'tor time and keeps /// info used to detect if a move gives check. 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 @@ -100,13 +70,13 @@ enum 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; }; @@ -136,8 +106,8 @@ struct StateInfo { class Position { - friend class MaterialInfo; - friend class EndgameFunctions; + Position(); // No default or copy c'tor allowed + Position(const Position& pos); public: enum GamePhase { @@ -146,17 +116,16 @@ public: }; // Constructors - Position(); - explicit Position(const Position& pos); - explicit Position(const std::string& fen); + Position(const Position& pos, int threadID); + Position(const std::string& fen, bool isChess960, int threadID); // Text input/output - void from_fen(const std::string& fen); + void from_fen(const std::string& fen, bool isChess960); const std::string to_fen() const; void print(Move m = MOVE_NONE) const; // Copying - void flipped_copy(const Position& pos); + void flip(); // The piece on a given square Piece piece_on(Square s) const; @@ -201,7 +170,7 @@ public: // Checking pieces and under check information Bitboard checkers() const; - bool is_check() const; + bool in_check() const; // Piece lists Square piece_list(Color c, PieceType pt, int index) const; @@ -209,34 +178,32 @@ public: // Information about attacks to or from a given square Bitboard attackers_to(Square s) const; + Bitboard attackers_to(Square s, Bitboard occ) const; Bitboard attacks_from(Piece p, Square s) const; + static Bitboard attacks_from(Piece p, Square s, Bitboard occ); template Bitboard attacks_from(Square s) const; template Bitboard attacks_from(Square s, Color c) const; // Properties of moves bool pl_move_is_legal(Move m, Bitboard pinned) const; - bool pl_move_is_evasion(Move m, Bitboard pinned) const; - bool move_is_check(Move m) const; - bool move_is_check(Move m, const CheckInfo& ci) const; + bool move_is_pl(const Move m) const; + bool move_gives_check(Move m) const; + bool move_gives_check(Move m, const CheckInfo& ci) const; bool move_is_capture(Move m) const; - bool move_is_capture_or_promotion(Move m) 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() const; + 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 detach(); + void do_setup_move(Move m); void do_move(Move m, StateInfo& st); void do_move(Move m, StateInfo& st, const CheckInfo& ci, bool moveIsCheck); void undo_move(Move m); @@ -244,10 +211,9 @@ public: void undo_null_move(); // 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; + static int see_value(PieceType pt); // Accessing hash keys Key get_key() const; @@ -258,24 +224,25 @@ public: // 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; + template bool is_draw() const; - // Check if one side threatens a mate in one - bool has_mate_threat(Color c); - - // Number of plies since the last non-reversible move - int rule_50_counter() const; + // Number of plies from starting position + 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(); + int64_t nodes_searched() const; + void set_nodes_searched(int64_t n); // Position consistency check, for debugging bool is_ok(int* failedStep = NULL) const; @@ -288,12 +255,15 @@ private: // Initialization helper functions (used while setting up a position) void clear(); + void detach(); void put_piece(Piece p, Square s); - void allow_oo(Color c); - void allow_ooo(Color c); + void set_castle_kingside(Color c); + void set_castle_queenside(Color c); + bool set_castling_rights(char token); + bool move_is_pl_slow(const Move m) const; // 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(); @@ -307,7 +277,7 @@ private: 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; @@ -326,27 +296,35 @@ private: // Other info Color sideToMove; - int gamePly; Key history[MaxGameLength]; int castleRightsMask[64]; - File initialKFile, initialKRFile, initialQRFile; StateInfo startState; + File initialKFile, initialKRFile, initialQRFile; + bool chess960; + int startPosPlyCounter; + int threadID; + int64_t nodes; StateInfo* st; // Static variables 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 int64_t Position::nodes_searched() const { + return nodes; +} -//// -//// Inline functions -//// +inline void Position::set_nodes_searched(int64_t n) { + nodes = n; +} inline Piece Position::piece_on(Square s) const { return board[s]; @@ -361,7 +339,7 @@ inline PieceType Position::type_of_piece_on(Square s) const { } 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 { @@ -369,11 +347,11 @@ 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 { @@ -385,7 +363,7 @@ inline Bitboard Position::occupied_squares() const { } inline Bitboard Position::empty_squares() const { - return ~(occupied_squares()); + return ~occupied_squares(); } inline Bitboard Position::pieces_of_color(Color c) const { @@ -412,8 +390,8 @@ inline int Position::piece_count(Color c, PieceType pt) 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 { @@ -428,16 +406,24 @@ inline Square Position::king_square(Color c) const { return pieceList[c][KING][0]; } -inline bool Position::can_castle_kingside(Color side) const { - return st->castleRights & (1+int(side)); +inline bool Position::can_castle_kingside(Color c) const { + return st->castleRights & (WHITE_OO << c); +} + +inline bool Position::can_castle_queenside(Color c) const { + return st->castleRights & (WHITE_OOO << c); +} + +inline bool Position::can_castle(Color c) const { + return st->castleRights & ((WHITE_OO | WHITE_OOO) << c); } -inline bool Position::can_castle_queenside(Color side) const { - return st->castleRights & (4+4*int(side)); +inline void Position::set_castle_kingside(Color c) { + st->castleRights |= (WHITE_OO << c); } -inline bool Position::can_castle(Color side) const { - return can_castle_kingside(side) || can_castle_queenside(side); +inline void Position::set_castle_queenside(Color c) { + st->castleRights |= (WHITE_OOO << c); } inline Square Position::initial_kr_square(Color c) const { @@ -450,12 +436,12 @@ inline Square Position::initial_qr_square(Color c) const { template<> inline Bitboard Position::attacks_from(Square s, Color c) const { - return StepAttackBB[piece_of_color_and_type(c, PAWN)][s]; + return StepAttacksBB[make_piece(c, PAWN)][s]; } template // Knight and King and white pawns inline Bitboard Position::attacks_from(Square s) const { - return StepAttackBB[Piece][s]; + return StepAttacksBB[Piece][s]; } template<> @@ -477,7 +463,7 @@ inline Bitboard Position::checkers() const { return st->checkersBB; } -inline bool Position::is_check() const { +inline bool Position::in_check() const { return st->checkersBB != EmptyBoardBB; } @@ -485,20 +471,12 @@ inline bool Position::pawn_is_passed(Color c, Square s) 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, opposite_color(c)) & attack_span_mask(c, s)); } -inline bool Position::square_is_weak(Square s, Color c) const { - return !(pieces(PAWN, c) & outpost_mask(opposite_color(c), s)); +inline int Position::see_value(PieceType pt) { + return seeValues[pt]; } inline Key Position::get_key() const { @@ -517,11 +495,11 @@ inline Key Position::get_material_key() const { return st->materialKey; } -inline Score Position::pst(Color c, PieceType pt, Square s) const { - return PieceSquareTable[piece_of_color_and_type(c, pt)][s]; +inline Score Position::pst(Color c, PieceType pt, Square s) { + return PieceSquareTable[make_piece(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]; } @@ -536,41 +514,40 @@ inline Value Position::non_pawn_material(Color c) const { inline bool Position::move_is_passed_pawn_push(Move m) const { Color c = side_to_move(); - return piece_on(move_from(m)) == piece_of_color_and_type(c, PAWN) + return piece_on(move_from(m)) == make_piece(c, PAWN) && pawn_is_passed(c, move_to(m)); } -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)); + return piece_count(WHITE, BISHOP) == 1 && piece_count(BLACK, BISHOP) == 1 + && opposite_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) & rank_bb(relative_rank(c, RANK_7)); +} - return pieces(PAWN, c) & relative_rank_bb(c, RANK_7); +inline bool Position::is_chess960() const { + return chess960; } inline bool Position::move_is_capture(Move m) const { - // Move must not be MOVE_NONE ! - return (m & (3 << 15)) ? !move_is_castle(m) : !square_is_empty(move_to(m)); + assert (m != MOVE_NONE && m != MOVE_NULL); + return !move_is_special(m) ? !square_is_empty(move_to(m)) : move_is_ep(m); } -inline bool Position::move_is_capture_or_promotion(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 PieceType Position::captured_piece() const { - return st->capture; +inline int Position::thread() const { + return threadID; } #endif // !defined(POSITION_H_INCLUDED)