#define POSITION_H_INCLUDED
#include <cassert>
+#include <cstddef>
#include "bitboard.h"
#include "types.h"
/// The checkInfo struct is initialized at c'tor time and keeps info used
/// to detect if a move gives check.
class Position;
-class Thread;
+struct Thread;
struct CheckInfo {
Bitboard dcCandidates;
Bitboard pinned;
- Bitboard checkSq[8];
+ Bitboard checkSq[PIECE_TYPE_NB];
Square ksq;
};
/// The StateInfo struct stores information we need to restore a Position
/// 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
+/// is made on the board (by calling Position::do_move), a StateInfo object
/// must be passed as a parameter.
struct StateInfo {
Key pawnKey, materialKey;
- Value npMaterial[2];
+ Value npMaterial[COLOR_NB];
int castleRights, rule50, pliesFromNull;
Score psqScore;
Square epSquare;
};
+/// When making a move the current StateInfo up to 'key' excluded is copied to
+/// the new one. Here we calculate the quad words (64bits) needed to be copied.
+const size_t StateCopySize64 = offsetof(StateInfo, key) / sizeof(uint64_t) + 1;
+
+
/// The position data structure. A position consists of the following data:
///
/// * For each piece type, a bitboard representing the squares occupied
class Position {
public:
Position() {}
- Position(const Position& p) { *this = p; }
Position(const Position& p, Thread* t) { *this = p; thisThread = t; }
- Position(const std::string& f, bool c960, Thread* t) { from_fen(f, c960, t); }
- void operator=(const Position&);
+ Position(const std::string& f, bool c960, Thread* t) { set(f, c960, t); }
+ Position& operator=(const Position&);
// Text input/output
- void from_fen(const std::string& fen, bool isChess960, Thread* th);
- const std::string to_fen() const;
- void print(Move m = MOVE_NONE) const;
+ void set(const std::string& fen, bool isChess960, Thread* th);
+ const std::string fen() const;
+ const std::string pretty(Move m = MOVE_NONE) const;
// Position representation
Bitboard pieces() 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;
+ Bitboard pieces(Color c) const;
+ Bitboard pieces(Color c, PieceType pt) const;
+ Bitboard pieces(Color c, PieceType pt1, PieceType pt2) const;
Piece piece_on(Square s) const;
Square king_square(Color c) const;
Square ep_square() const;
- bool square_empty(Square s) const;
+ bool is_empty(Square s) const;
const Square* piece_list(Color c, PieceType pt) const;
int piece_count(Color c, PieceType pt) const;
Square castle_rook_square(Color c, CastlingSide s) const;
// Checking
- bool in_check() const;
Bitboard checkers() const;
Bitboard discovered_check_candidates() const;
Bitboard pinned_pieces() const;
// Properties of moves
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;
void do_move(Move m, StateInfo& st);
void do_move(Move m, StateInfo& st, const CheckInfo& ci, bool moveIsCheck);
void undo_move(Move m);
- template<bool Do> void do_null_move(StateInfo& st);
+ void do_null_move(StateInfo& st);
+ void undo_null_move();
// Static exchange evaluation
int see(Move m) const;
// Other properties of the position
Color side_to_move() const;
- int startpos_ply_counter() const;
+ int game_ply() const;
bool is_chess960() const;
Thread* this_thread() const;
int64_t nodes_searched() const;
bool pos_is_ok(int* failedStep = NULL) const;
void flip();
- // Global initialization
- static void init();
-
private:
// Initialization helpers (used while setting up a position)
void clear();
void put_piece(Piece p, Square s);
void set_castle_right(Color c, Square rfrom);
- bool move_is_legal(const Move m) const;
- // Helper template functions
- template<bool Do> void do_castle_move(Move m);
+ // Helper functions
+ void do_castle(Square kfrom, Square kto, Square rfrom, Square rto);
template<bool FindPinned> Bitboard hidden_checkers() const;
// Computing hash keys from scratch (for initialization and debugging)
Value compute_non_pawn_material(Color c) const;
// Board and pieces
- Piece board[64]; // [square]
- Bitboard byTypeBB[8]; // [pieceType]
- Bitboard byColorBB[2]; // [color]
- int pieceCount[2][8]; // [color][pieceType]
- Square pieceList[2][8][16]; // [color][pieceType][index]
- int index[64]; // [square]
+ Piece board[SQUARE_NB];
+ Bitboard byTypeBB[PIECE_TYPE_NB];
+ Bitboard byColorBB[COLOR_NB];
+ int pieceCount[COLOR_NB][PIECE_TYPE_NB];
+ Square pieceList[COLOR_NB][PIECE_TYPE_NB][16];
+ int index[SQUARE_NB];
// Other info
- int castleRightsMask[64]; // [square]
- Square castleRookSquare[2][2]; // [color][side]
- Bitboard castlePath[2][2]; // [color][side]
+ int castleRightsMask[SQUARE_NB];
+ Square castleRookSquare[COLOR_NB][CASTLING_SIDE_NB];
+ Bitboard castlePath[COLOR_NB][CASTLING_SIDE_NB];
StateInfo startState;
int64_t nodes;
- int startPosPly;
+ int gamePly;
Color sideToMove;
Thread* thisThread;
StateInfo* st;
int chess960;
-
- // Static variables
- static Score pieceSquareTable[16][64]; // [piece][square]
- static Key zobrist[2][8][64]; // [color][pieceType][square]/[piece count]
- static Key zobEp[8]; // [file]
- static Key zobCastle[16]; // [castleRight]
- static Key zobSideToMove;
- static Key zobExclusion;
};
inline int64_t Position::nodes_searched() const {
return board[from_sq(m)];
}
-inline bool Position::square_empty(Square s) const {
+inline bool Position::is_empty(Square s) const {
return board[s] == NO_PIECE;
}
return byTypeBB[ALL_PIECES];
}
-inline Bitboard Position::pieces(Color c) const {
- return byColorBB[c];
-}
-
inline Bitboard Position::pieces(PieceType pt) const {
return byTypeBB[pt];
}
-inline Bitboard Position::pieces(PieceType pt, Color c) const {
- return byTypeBB[pt] & byColorBB[c];
-}
-
inline Bitboard Position::pieces(PieceType pt1, PieceType pt2) const {
return byTypeBB[pt1] | byTypeBB[pt2];
}
-inline Bitboard Position::pieces(PieceType pt1, PieceType pt2, Color c) const {
- return (byTypeBB[pt1] | byTypeBB[pt2]) & byColorBB[c];
+inline Bitboard Position::pieces(Color c) const {
+ return byColorBB[c];
+}
+
+inline Bitboard Position::pieces(Color c, PieceType pt) const {
+ return byColorBB[c] & byTypeBB[pt];
+}
+
+inline Bitboard Position::pieces(Color c, PieceType pt1, PieceType pt2) const {
+ return byColorBB[c] & (byTypeBB[pt1] | byTypeBB[pt2]);
}
inline int Position::piece_count(Color c, PieceType pt) const {
}
inline int Position::can_castle(Color c) const {
- return st->castleRights & ((WHITE_OO | WHITE_OOO) << c);
+ return st->castleRights & ((WHITE_OO | WHITE_OOO) << (2 * c));
}
inline bool Position::castle_impeded(Color c, CastlingSide s) const {
return st->checkersBB;
}
-inline bool Position::in_check() const {
- return st->checkersBB != 0;
-}
-
inline Bitboard Position::discovered_check_candidates() const {
return hidden_checkers<false>();
}
}
inline bool Position::pawn_is_passed(Color c, Square s) const {
- return !(pieces(PAWN, ~c) & passed_pawn_mask(c, s));
+ return !(pieces(~c, PAWN) & passed_pawn_mask(c, s));
}
inline Key Position::key() const {
}
inline Key Position::exclusion_key() const {
- return st->key ^ zobExclusion;
+ return st->key ^ Zobrist::exclusion;
}
inline Key Position::pawn_key() const {
&& pawn_is_passed(sideToMove, to_sq(m));
}
-inline int Position::startpos_ply_counter() const {
- return startPosPly + st->pliesFromNull; // HACK
+inline int Position::game_ply() const {
+ return gamePly;
}
inline bool Position::opposite_bishops() const {
}
inline bool Position::pawn_on_7th(Color c) const {
- return pieces(PAWN, c) & rank_bb(relative_rank(c, RANK_7));
+ return pieces(c, PAWN) & rank_bb(relative_rank(c, RANK_7));
}
inline bool Position::is_chess960() const {
inline bool Position::is_capture_or_promotion(Move m) const {
assert(is_ok(m));
- return is_special(m) ? !is_castle(m) : !square_empty(to_sq(m));
+ return type_of(m) ? type_of(m) != CASTLE : !is_empty(to_sq(m));
}
inline bool Position::is_capture(Move m) const {
// Note that castle is coded as "king captures the rook"
assert(is_ok(m));
- return (!square_empty(to_sq(m)) && !is_castle(m)) || is_enpassant(m);
+ return (!is_empty(to_sq(m)) && type_of(m) != CASTLE) || type_of(m) == ENPASSANT;
}
inline PieceType Position::captured_piece_type() const {
projects / stockfish / blobdiff