return hidden_checkers<false>();
}
-/// Position::attackers_to() computes a bitboard containing all pieces which
-/// attacks a given square.
-
-Bitboard Position::attackers_to(Square s) const {
-
- return (attacks_from<PAWN>(s, BLACK) & pieces(PAWN, WHITE))
- | (attacks_from<PAWN>(s, WHITE) & pieces(PAWN, BLACK))
- | (attacks_from<KNIGHT>(s) & pieces(KNIGHT))
- | (attacks_from<ROOK>(s) & pieces(ROOK, QUEEN))
- | (attacks_from<BISHOP>(s) & pieces(BISHOP, QUEEN))
- | (attacks_from<KING>(s) & pieces(KING));
-}
+/// Position::attackers_to() computes a bitboard of all pieces which attacks a
+/// given square. Slider attacks use occ bitboard as occupancy.
Bitboard Position::attackers_to(Square s, Bitboard occ) const {
| (attacks_from<KING>(s) & pieces(KING));
}
-/// Position::attacks_from() computes a bitboard of all attacks
-/// of a given piece put in a given square.
-
-Bitboard Position::attacks_from(Piece p, Square s) const {
-
- assert(square_is_ok(s));
-
- switch (p)
- {
- case WB: case BB: return attacks_from<BISHOP>(s);
- case WR: case BR: return attacks_from<ROOK>(s);
- case WQ: case BQ: return attacks_from<QUEEN>(s);
- default: return StepAttacksBB[p][s];
- }
-}
+/// Position::attacks_from() computes a bitboard of all attacks of a given piece
+/// put in a given square. Slider attacks use occ bitboard as occupancy.
Bitboard Position::attacks_from(Piece p, Square s, Bitboard occ) {
}
-/// Position::init() is a static member function which initializes at
-/// startup the various arrays used to compute hash keys and the piece
-/// square tables. The latter is a two-step operation: First, the white
-/// halves of the tables are copied from the MgPST[][] and EgPST[][] arrays.
-/// Second, the black halves of the tables are initialized by flipping
-/// and changing the sign of the corresponding white scores.
+/// Position::init() is a static member function which initializes at startup
+/// the various arrays used to compute hash keys and the piece square tables.
+/// The latter is a two-step operation: First, the white halves of the tables
+/// are copied from PSQT[] tables. Second, the black halves of the tables are
+/// initialized by flipping and changing the sign of the white scores.
void Position::init() {
return attacks_from<ROOK>(s) | attacks_from<BISHOP>(s);
}
+inline Bitboard Position::attacks_from(Piece p, Square s) const {
+ return attacks_from(p, s, occupied_squares());
+}
+
+inline Bitboard Position::attackers_to(Square s) const {
+ return attackers_to(s, occupied_squares());
+}
+
inline Bitboard Position::checkers() const {
return st->checkersBB;
}