/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2022 The Stockfish developers (see AUTHORS file)
+ Copyright (C) 2004-2023 The Stockfish developers (see AUTHORS file)
Stockfish is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
struct StateInfo {
// Copied when making a move
- Key pawnKey;
Key materialKey;
Value nonPawnMaterial[COLOR_NB];
int castlingRights;
/// start position to the position just before the search starts). Needed by
/// 'draw by repetition' detection. Use a std::deque because pointers to
/// elements are not invalidated upon list resizing.
-typedef std::unique_ptr<std::deque<StateInfo>> StateListPtr;
+using StateListPtr = std::unique_ptr<std::deque<StateInfo>>;
/// Position class stores information regarding the board representation as
std::string fen() const;
// Position representation
- Bitboard pieces(PieceType pt) const;
- Bitboard pieces(PieceType pt1, PieceType pt2) const;
+ Bitboard pieces(PieceType pt = ALL_PIECES) const;
+ template<typename ...PieceTypes> Bitboard pieces(PieceType pt, PieceTypes... pts) const;
Bitboard pieces(Color c) const;
- Bitboard pieces(Color c, PieceType pt) const;
- Bitboard pieces(Color c, PieceType pt1, PieceType pt2) const;
+ template<typename ...PieceTypes> Bitboard pieces(Color c, PieceTypes... pts) const;
Piece piece_on(Square s) const;
Square ep_square() const;
bool empty(Square s) const;
template<PieceType Pt> int count(Color c) const;
template<PieceType Pt> int count() const;
template<PieceType Pt> Square square(Color c) const;
- bool is_on_semiopen_file(Color c, Square s) const;
// Castling
CastlingRights castling_rights(Color c) const;
bool legal(Move m) const;
bool pseudo_legal(const Move m) const;
bool capture(Move m) const;
+ bool capture_stage(Move m) const;
bool gives_check(Move m) const;
Piece moved_piece(Move m) const;
Piece captured_piece() const;
- // Piece specific
- bool pawn_passed(Color c, Square s) const;
- bool opposite_bishops() const;
- int pawns_on_same_color_squares(Color c, Square s) const;
-
// Doing and undoing moves
void do_move(Move m, StateInfo& newSt);
void do_move(Move m, StateInfo& newSt, bool givesCheck);
// Static Exchange Evaluation
bool see_ge(Move m, Value threshold = VALUE_ZERO) const;
+ bool see_ge(Move m, Bitboard& occupied, Value threshold = VALUE_ZERO) const;
// Accessing hash keys
Key key() const;
Key key_after(Move m) const;
Key material_key() const;
- Key pawn_key() const;
// Other properties of the position
Color side_to_move() const;
bool has_game_cycle(int ply) const;
bool has_repeated() const;
int rule50_count() const;
- Score psq_score() const;
Value psq_eg_stm() const;
Value non_pawn_material(Color c) const;
Value non_pawn_material() const;
private:
// Initialization helpers (used while setting up a position)
void set_castling_right(Color c, Square rfrom);
- void set_state(StateInfo* si) const;
- void set_check_info(StateInfo* si) const;
+ void set_state() const;
+ void set_check_info() const;
// Other helpers
void move_piece(Square from, Square to);
bool chess960;
};
-extern std::ostream& operator<<(std::ostream& os, const Position& pos);
+std::ostream& operator<<(std::ostream& os, const Position& pos);
inline Color Position::side_to_move() const {
return sideToMove;
return piece_on(from_sq(m));
}
-inline Bitboard Position::pieces(PieceType pt = ALL_PIECES) const {
+inline Bitboard Position::pieces(PieceType pt) const {
return byTypeBB[pt];
}
-inline Bitboard Position::pieces(PieceType pt1, PieceType pt2) const {
- return pieces(pt1) | pieces(pt2);
+template<typename ...PieceTypes>
+inline Bitboard Position::pieces(PieceType pt, PieceTypes... pts) const {
+ return pieces(pt) | pieces(pts...);
}
inline Bitboard Position::pieces(Color c) const {
return byColorBB[c];
}
-inline Bitboard Position::pieces(Color c, PieceType pt) const {
- return pieces(c) & pieces(pt);
-}
-
-inline Bitboard Position::pieces(Color c, PieceType pt1, PieceType pt2) const {
- return pieces(c) & (pieces(pt1) | pieces(pt2));
+template<typename ...PieceTypes>
+inline Bitboard Position::pieces(Color c, PieceTypes... pts) const {
+ return pieces(c) & pieces(pts...);
}
template<PieceType Pt> inline int Position::count(Color c) const {
return st->epSquare;
}
-inline bool Position::is_on_semiopen_file(Color c, Square s) const {
- return !(pieces(c, PAWN) & file_bb(s));
-}
-
inline bool Position::can_castle(CastlingRights cr) const {
return st->castlingRights & cr;
}
return st->checkSquares[pt];
}
-inline bool Position::pawn_passed(Color c, Square s) const {
- return !(pieces(~c, PAWN) & passed_pawn_span(c, s));
-}
-
-inline int Position::pawns_on_same_color_squares(Color c, Square s) const {
- return popcount(pieces(c, PAWN) & ((DarkSquares & s) ? DarkSquares : ~DarkSquares));
-}
-
inline Key Position::key() const {
return adjust_key50<false>(st->key);
}
? k : k ^ make_key((st->rule50 - (14 - AfterMove)) / 8);
}
-inline Key Position::pawn_key() const {
- return st->pawnKey;
-}
-
inline Key Position::material_key() const {
return st->materialKey;
}
-inline Score Position::psq_score() const {
- return psq;
-}
-
inline Value Position::psq_eg_stm() const {
return (sideToMove == WHITE ? 1 : -1) * eg_value(psq);
}
return st->rule50;
}
-inline bool Position::opposite_bishops() const {
- return count<BISHOP>(WHITE) == 1
- && count<BISHOP>(BLACK) == 1
- && opposite_colors(square<BISHOP>(WHITE), square<BISHOP>(BLACK));
-}
-
inline bool Position::is_chess960() const {
return chess960;
}
inline bool Position::capture(Move m) const {
assert(is_ok(m));
- // Castling is encoded as "king captures rook"
- return (!empty(to_sq(m)) && type_of(m) != CASTLING) || type_of(m) == EN_PASSANT;
+ return (!empty(to_sq(m)) && type_of(m) != CASTLING)
+ || type_of(m) == EN_PASSANT;
+}
+
+// returns true if a move is generated from the capture stage
+// having also queen promotions covered, i.e. consistency with the capture stage move generation
+// is needed to avoid the generation of duplicate moves.
+inline bool Position::capture_stage(Move m) const {
+ assert(is_ok(m));
+ return capture(m) || promotion_type(m) == QUEEN;
}
inline Piece Position::captured_piece() const {