friend class EndgameFunctions;
public:
+ enum GamePhase {
+ MidGame,
+ EndGame
+ };
+
// Constructors
- Position() {};
+ Position() {}
Position(const Position& pos);
Position(const std::string& fen);
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;
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(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;
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;
bool move_is_passed_pawn_push(Move m) const;
- bool move_was_passed_pawn_push(Move m) const;
bool move_attacks_square(Move m, Square s) 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;
+ 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);
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;
Value eg_value() const;
Value non_pawn_material(Color c) const;
Phase game_phase() const;
- Value mg_pst_delta(Move m) const;
+ template<GamePhase> Value pst_delta(Piece piece, Square from, Square to) const;
// Game termination checks
bool is_mate() const;
void allow_ooo(Color c);
// Helper functions for doing and undoing moves
- void do_capture_move(PieceType capture, Color them, Square to);
+ void do_capture_move(Bitboard& 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<PieceType Piece>
Key compute_material_key() const;
// Computing incremental evaluation scores and material counts
- enum GamePhase {
- MidGame,
- EndGame
- };
template<GamePhase> Value pst(Color c, PieceType pt, Square s) const;
template<GamePhase> Value compute_value() const;
Value compute_non_pawn_material(Color c) const;
// Piece lists
Square pieceList[2][8][16]; // [color][pieceType][index]
- int index[64];
+ int index[64]; // [square]
// Other info
Square kingSquare[2];
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::pieces(PieceType pt, Color c) const {
+ return byTypeBB[pt] & byColorBB[c];
}
-inline Bitboard Position::bishops(Color c) const {
- return pieces_of_color_and_type(c, BISHOP);
+inline Bitboard Position::pieces(PieceType pt1, PieceType pt2) const {
+ return byTypeBB[pt1] | byTypeBB[pt2];
}
-inline Bitboard Position::rooks(Color c) const {
- return pieces_of_color_and_type(c, ROOK);
-}
-
-inline Bitboard Position::queens(Color c) const {
- return pieces_of_color_and_type(c, QUEEN);
-}
-
-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 StepAttackBB[piece_of_color_and_type(c, PAWN)][s];
}
-template<>
-inline Bitboard Position::piece_attacks<PAWN>(Square s) const {
- return StepAttackBB[piece_of_color_and_type(opposite_color(sideToMove), PAWN)][s];
+template<PieceType Piece> // Knight and King
+inline Bitboard Position::piece_attacks(Square s) const {
+ return StepAttackBB[Piece][s];
}
template<>
-inline Bitboard Position::piece_attacks<KNIGHT>(Square s) const {
- return StepAttackBB[KNIGHT][s];
+inline Bitboard Position::piece_attacks<PAWN>(Square s) const {
+ return StepAttackBB[WP][s] | StepAttackBB[BP][s];
}
template<>
return piece_attacks<ROOK>(s) | piece_attacks<BISHOP>(s);
}
-template<>
-inline Bitboard Position::piece_attacks<KING>(Square s) const {
- return StepAttackBB[KING][s];
-}
-
inline Bitboard Position::checkers() const {
return st->checkersBB;
}
}
template<PieceType Piece>
-Bitboard Position::piece_attacks_square(Square f, Square t) const {
+inline Bitboard Position::piece_attacks_square(Square f, Square t) const {
return bit_is_set(piece_attacks<Piece>(f), t);
}
}
inline bool Position::pawn_is_passed(Color c, Square s) const {
- return !(pawns(opposite_color(c)) & passed_pawn_mask(c, s));
+ return !(pieces(PAWN, 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_passed(Bitboard theirPawns, Color c, Square s) {
+ return !(theirPawns & passed_pawn_mask(c, s));
}
-inline bool Position::pawn_is_doubled(Color c, Square s) const {
- return pawns(c) & squares_behind(c, s);
+inline bool Position::pawn_is_isolated(Bitboard ourPawns, Square s) {
+ return !(ourPawns & neighboring_files_bb(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::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 !(pawns(c) & outpost_mask(opposite_color(c), s));
+ return !(pieces(PAWN, c) & outpost_mask(opposite_color(c), s));
}
inline Key Position::get_key() const {
return st->materialKey;
}
-template<Position::GamePhase Phase>
+template<Position::GamePhase Ph>
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<Position::GamePhase Ph>
+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 {
inline Phase Position::game_phase() const {
// Values modified by Joona Kiiski
- static const Value MidgameLimit = Value(15713);
- static const Value EndgameLimit = Value(4428);
+ static const Value MidgameLimit = Value(15581);
+ static const Value EndgameLimit = Value(3998);
Value npm = non_pawn_material(WHITE) + non_pawn_material(BLACK);
return Phase(((npm - EndgameLimit) * 128) / (MidgameLimit - EndgameLimit));
}
-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 bool Position::move_is_pawn_push_to_7th(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_7;
-}
-
inline bool Position::move_is_passed_pawn_push(Move m) const {
Color c = side_to_move();
&& pawn_is_passed(c, move_to(m));
}
-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 int Position::rule_50_counter() const {
return st->rule50;
inline bool Position::has_pawn_on_7th(Color c) const {
- return pawns(c) & relative_rank_bb(c, RANK_7);
+ return pieces(PAWN, c) & relative_rank_bb(c, RANK_7);
}
inline bool Position::move_is_capture(Move m) const {
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