X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fposition.h;h=c4dbfcf6bef163aac51ab3b6a40bce43decb261d;hp=8d1ba3598c2da91c9252bbdf39efa3be3fea3fda;hb=2fe4e10b0bf11e98f66185c04084e87a1341af02;hpb=8f59de48f559e477dc383d5b51a0b842986758d0 diff --git a/src/position.h b/src/position.h index 8d1ba359..d6c79ee1 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) 2008-2010 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 @@ -17,59 +17,26 @@ along with this program. If not, see . */ - #if !defined(POSITION_H_INCLUDED) #define POSITION_H_INCLUDED -// Disable a silly and noisy warning from MSVC compiler -#if defined(_MSC_VER) - -// Forcing value to bool 'true' or 'false' (performance warning) -#pragma warning(disable: 4800) - -#endif - -//// -//// Includes -//// +#include #include "bitboard.h" -#include "color.h" -#include "direction.h" #include "move.h" -#include "piece.h" -#include "phase.h" -#include "square.h" -#include "value.h" +#include "types.h" -//// -//// Constants -//// +/// The checkInfo struct is initialized at c'tor time and keeps info used +/// to detect if a move gives check. -/// FEN string for the initial position: -const std::string StartPosition = - "rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1"; +struct CheckInfo { -/// 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; + explicit CheckInfo(const Position&); - -//// -//// Types -//// - -/// 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 + Bitboard dcCandidates; + Bitboard pinned; + Bitboard checkSq[8]; }; @@ -77,70 +44,63 @@ enum CastleRights { /// 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 /// must be passed as a parameter. +class Position; struct StateInfo { - Bitboard pinners[2], pinned[2], dcCandidates[2], checkersBB; - Key key, pawnKey, materialKey; - int castleRights, rule50; + Key pawnKey, materialKey; + Value npMaterial[2]; + int castleRights, rule50, pliesFromNull; + Score value; Square epSquare; - Move lastMove; - Value mgValue, egValue; - PieceType capture; + + Key key; + Bitboard checkersBB; + PieceType capturedType; StateInfo* previous; }; -/// 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. class Position { - friend class MaterialInfo; - friend class EndgameFunctions; + // No defaul, copy c'tor or assignment allowed, default c'tor will not be + // generated anyhow because of user-defined c'tors. + Position(const Position&); + Position& operator=(const Position&); public: - // Constructors - Position() {}; - Position(const Position& pos); - 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 copy(const Position &pos); - void flipped_copy(const Position &pos); - // The piece on a given square Piece piece_on(Square s) const; - PieceType type_of_piece_on(Square s) const; - Color color_of_piece_on(Square s) const; bool square_is_empty(Square s) const; - bool square_is_occupied(Square s) const; - Value midgame_value_of_piece_on(Square s) const; - Value endgame_value_of_piece_on(Square s) const; // Side to move Color side_to_move() const; @@ -148,27 +108,11 @@ public: // Bitboard representation of the position Bitboard empty_squares() const; Bitboard occupied_squares() const; - Bitboard pieces_of_color(Color c) const; - Bitboard pieces_of_type(PieceType pt) const; - Bitboard pieces_of_color_and_type(Color c, PieceType pt) const; - Bitboard pawns() const; - Bitboard knights() const; - Bitboard bishops() const; - Bitboard rooks() const; - Bitboard queens() const; - Bitboard kings() const; - Bitboard rooks_and_queens() const; - Bitboard bishops_and_queens() const; - Bitboard sliders() const; - Bitboard pawns(Color c) const; - Bitboard knights(Color c) const; - Bitboard bishops(Color c) const; - Bitboard rooks(Color c) const; - Bitboard queens(Color c) const; - Bitboard kings(Color c) const; - Bitboard rooks_and_queens(Color c) const; - Bitboard bishops_and_queens(Color c) const; - Bitboard sliders_of_color(Color c) 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; // Number of pieces of each color and type int piece_count(Color c, PieceType pt) const; @@ -180,134 +124,106 @@ public: Square king_square(Color c) const; // Castling rights - bool can_castle_kingside(Color c) const; - bool can_castle_queenside(Color c) const; + bool can_castle(CastleRight f) const; bool can_castle(Color c) const; - Square initial_kr_square(Color c) const; - Square initial_qr_square(Color c) const; - - // Attack bitboards - Bitboard sliding_attacks(Square s, Direction d) const; - Bitboard ray_attacks(Square s, SignedDirection d) const; - Bitboard pawn_attacks(Color c, Square s) const; - - template - Bitboard piece_attacks(Square s) const; + Square castle_rook_square(CastleRight f) const; // Bitboards for pinned pieces and discovered check candidates - Bitboard discovered_check_candidates(Color c) const; - Bitboard pinned_pieces(Color c, Bitboard& p) const; - Bitboard pinned_pieces(Color c) const; + Bitboard discovered_check_candidates() const; + Bitboard pinned_pieces() const; - // Checking pieces + // Checking pieces and under check information Bitboard checkers() const; + bool in_check() const; // Piece lists - Square piece_list(Color c, PieceType pt, int index) const; + const Square* piece_list(Color c, PieceType pt) const; - // Attack information for a given square - bool square_is_attacked(Square s, Color c) const; - Bitboard attacks_to(Square s) const; - Bitboard attacks_to(Square s, Color c) const; - bool is_check() const; - bool pawn_attacks_square(Color c, Square f, Square t) const; - - template - Bitboard piece_attacks_square(Square f, Square t) const; // Dispatch at compile-time - - bool piece_attacks_square(Piece p, Square f, Square t) const; // Dispatch at run-time + // 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) const; - bool move_is_check(Move m) 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; - bool move_is_passed_pawn_push(Move m) const; - bool move_was_passed_pawn_push(Move m) const; + 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; + bool is_capture_or_promotion(Move m) const; + bool is_passed_pawn_push(Move m) const; + + // Piece captured with previous moves + PieceType captured_piece_type() const; // 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; - - // Weak squares - bool square_is_weak(Square s, Color c) const; // Doing and undoing moves void do_move(Move m, StateInfo& st); + void do_move(Move m, StateInfo& st, const CheckInfo& ci, bool moveIsCheck); void undo_move(Move m); void do_null_move(StateInfo& st); 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; // Accessing hash keys Key get_key() const; + Key get_exclusion_key() const; Key get_pawn_key() const; Key get_material_key() const; // Incremental evaluation - Value mg_value() const; - Value eg_value() const; + Score value() const; Value non_pawn_material(Color c) const; - Phase game_phase() const; - Value mg_pst_delta(Move m) const; + Score pst_delta(Piece piece, Square from, Square to) const; // 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; + // 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 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; + bool pos_is_ok(int* failedStep = NULL) const; + void flip_me(); - // Static member functions: - static void init_zobrist(); - static void init_piece_square_tables(); + // Global initialization + static void init(); 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 set_castle_right(Square ksq, Square rsq); + bool move_is_legal(const Move m) const; // Helper functions for doing and undoing moves - void do_capture_move(Move m, PieceType capture, Color them, Square to); + void do_capture_move(Key& key, 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(); - - 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() const; // Computing hash keys from scratch (for initialization and debugging) Key compute_key() const; @@ -315,79 +231,58 @@ 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; + Score pst(Piece p, Square s) const; + Score compute_value() const; Value compute_non_pawn_material(Color c) const; - // Bitboards - Bitboard byColorBB[2], byTypeBB[8]; - // Board - Piece board[64]; + Piece board[64]; // [square] + + // Bitboards + Bitboard byTypeBB[8]; // [pieceType] + Bitboard byColorBB[2]; // [color] // Piece counts - int pieceCount[2][8]; // [color][pieceType] + int pieceCount[2][8]; // [color][pieceType] // Piece lists - Square pieceList[2][8][16]; // [color][pieceType][index] - int index[64]; + Square pieceList[2][8][16]; // [color][pieceType][index] + int index[64]; // [square] // Other info - Square kingSquare[2]; - Color sideToMove; - int gamePly; - Key history[MaxGameLength]; - Value npMaterial[2]; - File initialKFile, initialKRFile, initialQRFile; + int castleRightsMask[64]; // [square] + Square castleRookSquare[16]; // [castleRight] StateInfo startState; + int64_t nodes; + int startPosPly; + Color sideToMove; + int threadID; StateInfo* st; + int chess960; // 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 Score pieceSquareTable[16][64]; // [piece][square] + static Key zobrist[2][8][64]; // [color][pieceType][square]/[piece count] + static Key zobEp[64]; // [square] + static Key zobCastle[16]; // [castleRight] static Key zobSideToMove; - static Value MgPieceSquareTable[16][64]; - static Value EgPieceSquareTable[16][64]; + static Key zobExclusion; }; - -//// -//// Inline functions -//// - -inline Piece Position::piece_on(Square s) const { - return board[s]; +inline int64_t Position::nodes_searched() const { + return nodes; } -inline Color Position::color_of_piece_on(Square s) const { - return color_of_piece(piece_on(s)); +inline void Position::set_nodes_searched(int64_t n) { + nodes = n; } -inline PieceType Position::type_of_piece_on(Square s) const { - return type_of_piece(piece_on(s)); +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; -} - -inline bool Position::square_is_occupied(Square s) const { - return !square_is_empty(s); -} - -inline Value Position::midgame_value_of_piece_on(Square s) const { - return piece_value_midgame(piece_on(s)); -} - -inline Value Position::endgame_value_of_piece_on(Square s) const { - return piece_value_endgame(piece_on(s)); + return board[s] == PIECE_NONE; } inline Color Position::side_to_move() const { @@ -399,99 +294,35 @@ inline Bitboard Position::occupied_squares() const { } inline Bitboard Position::empty_squares() const { - return ~(occupied_squares()); + return ~byTypeBB[0]; } -inline Bitboard Position::pieces_of_color(Color c) const { +inline Bitboard Position::pieces(Color c) const { return byColorBB[c]; } -inline Bitboard Position::pieces_of_type(PieceType pt) const { +inline Bitboard Position::pieces(PieceType pt) const { return byTypeBB[pt]; } -inline Bitboard Position::pieces_of_color_and_type(Color c, PieceType pt) const { - return pieces_of_color(c) & pieces_of_type(pt); -} - -inline Bitboard Position::pawns() const { - return pieces_of_type(PAWN); -} - -inline Bitboard Position::knights() const { - return pieces_of_type(KNIGHT); -} - -inline Bitboard Position::bishops() const { - return pieces_of_type(BISHOP); -} - -inline Bitboard Position::rooks() const { - return pieces_of_type(ROOK); -} - -inline Bitboard Position::queens() const { - return pieces_of_type(QUEEN); -} - -inline Bitboard Position::kings() const { - return pieces_of_type(KING); -} - -inline Bitboard Position::rooks_and_queens() const { - return rooks() | queens(); -} - -inline Bitboard Position::bishops_and_queens() const { - return bishops() | queens(); -} - -inline Bitboard Position::sliders() const { - return bishops() | queens() | rooks(); -} - -inline Bitboard Position::pawns(Color c) const { - return pieces_of_color_and_type(c, PAWN); -} - -inline Bitboard Position::knights(Color c) const { - return pieces_of_color_and_type(c, KNIGHT); -} - -inline Bitboard Position::bishops(Color c) const { - return pieces_of_color_and_type(c, BISHOP); -} - -inline Bitboard Position::rooks(Color c) const { - return pieces_of_color_and_type(c, ROOK); +inline Bitboard Position::pieces(PieceType pt, Color c) const { + return byTypeBB[pt] & byColorBB[c]; } -inline Bitboard Position::queens(Color c) const { - return pieces_of_color_and_type(c, QUEEN); +inline Bitboard Position::pieces(PieceType pt1, PieceType pt2) const { + return byTypeBB[pt1] | byTypeBB[pt2]; } -inline Bitboard Position::kings(Color c) const { - return pieces_of_color_and_type(c, KING); -} - -inline Bitboard Position::rooks_and_queens(Color c) const { - return rooks_and_queens() & pieces_of_color(c); -} - -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 Bitboard Position::pieces(PieceType pt1, PieceType pt2, Color c) const { + return (byTypeBB[pt1] | byTypeBB[pt2]) & byColorBB[c]; } 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 const Square* Position::piece_list(Color c, PieceType pt) const { + return pieceList[c][pt]; } inline Square Position::ep_square() const { @@ -499,118 +330,74 @@ inline Square Position::ep_square() const { } inline Square Position::king_square(Color c) const { - return kingSquare[c]; -} - -inline bool Position::can_castle_kingside(Color side) const { - return st->castleRights & (1+int(side)); + return pieceList[c][KING][0]; } -inline bool Position::can_castle_queenside(Color side) const { - return st->castleRights & (4+4*int(side)); +inline bool Position::can_castle(CastleRight f) const { + return st->castleRights & f; } -inline bool Position::can_castle(Color side) const { - return can_castle_kingside(side) || can_castle_queenside(side); +inline bool Position::can_castle(Color c) const { + return st->castleRights & ((WHITE_OO | WHITE_OOO) << c); } -inline Square Position::initial_kr_square(Color c) const { - return relative_square(c, make_square(initialKRFile, RANK_1)); -} - -inline Square Position::initial_qr_square(Color c) const { - return relative_square(c, make_square(initialQRFile, RANK_1)); -} - -inline Bitboard Position::pawn_attacks(Color c, Square s) const { - return StepAttackBB[piece_of_color_and_type(c, PAWN)][s]; +inline Square Position::castle_rook_square(CastleRight f) const { + return castleRookSquare[f]; } template<> -inline Bitboard Position::piece_attacks(Square s) const { - return StepAttackBB[piece_of_color_and_type(opposite_color(sideToMove), PAWN)][s]; +inline Bitboard Position::attacks_from(Square s, Color c) const { + return StepAttacksBB[make_piece(c, PAWN)][s]; } -template<> -inline Bitboard Position::piece_attacks(Square s) const { - return StepAttackBB[KNIGHT][s]; +template // Knight and King and white pawns +inline Bitboard Position::attacks_from(Square s) const { + return StepAttacksBB[Piece][s]; } template<> -inline Bitboard Position::piece_attacks(Square s) const { +inline Bitboard Position::attacks_from(Square s) const { return bishop_attacks_bb(s, occupied_squares()); } template<> -inline Bitboard Position::piece_attacks(Square s) const { +inline Bitboard Position::attacks_from(Square s) const { return rook_attacks_bb(s, occupied_squares()); } template<> -inline Bitboard Position::piece_attacks(Square s) const { - return piece_attacks(s) | piece_attacks(s); +inline Bitboard Position::attacks_from(Square s) const { + return attacks_from(s) | attacks_from(s); } -template<> -inline Bitboard Position::piece_attacks(Square s) const { - return StepAttackBB[KING][s]; +inline Bitboard Position::attacks_from(Piece p, Square s) const { + return attacks_from(p, s, occupied_squares()); } -inline Bitboard Position::checkers() const { - return st->checkersBB; +inline Bitboard Position::attackers_to(Square s) const { + return attackers_to(s, occupied_squares()); } -inline bool Position::is_check() const { - return st->checkersBB != EmptyBoardBB; -} - -inline bool Position::pawn_attacks_square(Color c, Square f, Square t) const { - return bit_is_set(pawn_attacks(c, f), t); -} - -template -Bitboard Position::piece_attacks_square(Square f, Square t) const { - return bit_is_set(piece_attacks(f), t); -} - -inline Bitboard Position::attacks_to(Square s, Color c) const { - - return attacks_to(s) & pieces_of_color(c); +inline Bitboard Position::checkers() const { + return st->checkersBB; } -inline bool Position::square_is_attacked(Square s, Color c) const { - - return attacks_to(s, c) != EmptyBoardBB; +inline bool Position::in_check() const { + return st->checkersBB != 0; } 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::file_is_open(File f) const { - return !(pawns() & file_bb(f)); -} - -inline bool Position::file_is_half_open(Color c, File f) const { - return !(pawns(c) & file_bb(f)); -} - -inline bool Position::square_is_weak(Square s, Color c) const { - return !(pawns(c) & outpost_mask(opposite_color(c), s)); + return !(pieces(PAWN, flip(c)) & passed_pawn_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; } @@ -619,95 +406,66 @@ inline Key Position::get_material_key() const { return st->materialKey; } -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]); +inline Score Position::pst(Piece p, Square s) const { + return pieceSquareTable[p][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)]; +inline Score Position::pst_delta(Piece piece, Square from, Square to) const { + return pieceSquareTable[piece][to] - pieceSquareTable[piece][from]; } -inline Value Position::mg_value() const { - return st->mgValue; -} - -inline Value Position::eg_value() const { - return st->egValue; +inline Score Position::value() const { + return st->value; } 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); +inline bool Position::is_passed_pawn_push(Move m) const { - Value npm = non_pawn_material(WHITE) + non_pawn_material(BLACK); - - if (npm >= MidgameLimit) - return PHASE_MIDGAME; - else if(npm <= EndgameLimit) - return PHASE_ENDGAME; - else - return Phase(((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit)); + return board[move_from(m)] == make_piece(sideToMove, PAWN) + && pawn_is_passed(sideToMove, move_to(m)); } -inline bool Position::move_is_deep_pawn_push(Move m) const { - - Color c = side_to_move(); - return piece_on(move_from(m)) == piece_of_color_and_type(c, PAWN) - && relative_rank(c, move_to(m)) > RANK_4; +inline int Position::startpos_ply_counter() const { + return startPosPly + st->pliesFromNull; // HACK } -inline bool Position::move_is_pawn_push_to_7th(Move m) const { +inline bool Position::opposite_colored_bishops() const { - Color c = side_to_move(); - return piece_on(move_from(m)) == piece_of_color_and_type(c, PAWN) - && relative_rank(c, move_to(m)) == RANK_7; + return pieceCount[WHITE][BISHOP] == 1 + && pieceCount[BLACK][BISHOP] == 1 + && opposite_colors(pieceList[WHITE][BISHOP][0], pieceList[BLACK][BISHOP][0]); } -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) - && pawn_is_passed(c, move_to(m)); +inline bool Position::has_pawn_on_7th(Color c) const { + return pieces(PAWN, c) & rank_bb(relative_rank(c, RANK_7)); } -inline bool Position::move_was_passed_pawn_push(Move m) const { - - Color c = opposite_color(side_to_move()); - return piece_on(move_to(m)) == piece_of_color_and_type(c, PAWN) - && pawn_is_passed(c, move_to(m)); +inline bool Position::is_chess960() const { + return chess960; } -inline int Position::rule_50_counter() const { +inline bool Position::is_capture_or_promotion(Move m) const { - return st->rule50; + assert(is_ok(m)); + return is_special(m) ? !is_castle(m) : !square_is_empty(move_to(m)); } -inline bool Position::opposite_colored_bishops() const { +inline bool Position::is_capture(Move m) 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)); + // 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); } -inline bool Position::has_pawn_on_7th(Color c) const { - - return pawns(c) & relative_rank_bb(c, RANK_7); +inline PieceType Position::captured_piece_type() const { + return st->capturedType; } +inline int Position::thread() const { + return threadID; +} #endif // !defined(POSITION_H_INCLUDED)