- enum CastlingSide { KING_SIDE, QUEEN_SIDE };
-
- template<CastlingSide Side, bool OnlyChecks>
- MoveStack* generate_castle_moves(const Position& pos, MoveStack* mlist, Color us) {
-
- const CastleRight CR[] = { Side ? WHITE_OOO : WHITE_OO,
- Side ? BLACK_OOO : BLACK_OO };
-
- if (!pos.can_castle(CR[us]))
- return mlist;
-
- // After castling, the rook and king final positions are the same in Chess960
- // as they would be in standard chess.
- Square kfrom = pos.king_square(us);
- Square rfrom = pos.castle_rook_square(CR[us]);
- Square kto = relative_square(us, Side == KING_SIDE ? SQ_G1 : SQ_C1);
- Square rto = relative_square(us, Side == KING_SIDE ? SQ_F1 : SQ_D1);
- Bitboard enemies = pos.pieces(~us);
-
- assert(!pos.in_check());
- assert(pos.piece_on(kfrom) == make_piece(us, KING));
- assert(pos.piece_on(rfrom) == make_piece(us, ROOK));
-
- // Unimpeded rule: All the squares between the king's initial and final squares
- // (including the final square), and all the squares between the rook's initial
- // and final squares (including the final square), must be vacant except for
- // the king and castling rook.
- for (Square s = std::min(rfrom, rto), e = std::max(rfrom, rto); s <= e; s++)
- if (s != kfrom && s != rfrom && !pos.square_is_empty(s))
- return mlist;
-
- for (Square s = std::min(kfrom, kto), e = std::max(kfrom, kto); s <= e; s++)
- if ( (s != kfrom && s != rfrom && !pos.square_is_empty(s))
- ||(pos.attackers_to(s) & enemies))
- return mlist;
-
- // Because we generate only legal castling moves we need to verify that
- // when moving the castling rook we do not discover some hidden checker.
- // For instance an enemy queen in SQ_A1 when castling rook is in SQ_B1.
- if (pos.is_chess960())
- {
- Bitboard occ = pos.occupied_squares();
- clear_bit(&occ, rfrom);
- if (pos.attackers_to(kto, occ) & enemies)
- return mlist;
- }
-
- (*mlist++).move = make_castle(kfrom, rfrom);
-
- if (OnlyChecks && !pos.move_gives_check((mlist - 1)->move, CheckInfo(pos)))
- mlist--;
-
- return mlist;
- }
-
-
- template<Square Delta>
- inline Bitboard move_pawns(Bitboard p) {
-
- return Delta == DELTA_N ? p << 8
- : Delta == DELTA_S ? p >> 8
- : Delta == DELTA_NE ? (p & ~FileHBB) << 9
- : Delta == DELTA_SE ? (p & ~FileHBB) >> 7
- : Delta == DELTA_NW ? (p & ~FileABB) << 7
- : Delta == DELTA_SW ? (p & ~FileABB) >> 9 : p;
- }
-
-
- template<Square Delta>
- inline MoveStack* generate_pawn_captures(MoveStack* mlist, Bitboard pawns, Bitboard target) {
-
- Bitboard b = move_pawns<Delta>(pawns) & target;
- SERIALIZE_PAWNS(b, -Delta);
- return mlist;
- }
-
-
- template<MoveType Type, Square Delta>
- inline MoveStack* generate_promotions(MoveStack* mlist, Bitboard pawnsOn7, Bitboard target, Square ksq) {