X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fmovegen.cpp;h=4ae16b4b37eb71ede0d8abf96fee0695f153e3ec;hp=289b51adefa43e8749bd53c008e6d173bf3dad28;hb=dc88cd691f5b393fe52c1b2be93d467def7391ea;hpb=6058e7cf60b043cfb142604d0956c32c24098b00 diff --git a/src/movegen.cpp b/src/movegen.cpp index 289b51ad..4ae16b4b 100644 --- a/src/movegen.cpp +++ b/src/movegen.cpp @@ -32,54 +32,34 @@ (*mlist++).move = make_move(to - (d), to); } namespace { - enum CastlingSide { KING_SIDE, QUEEN_SIDE }; - template - MoveStack* generate_castle_moves(const Position& pos, MoveStack* mlist, Color us) { - - const CastleRight CR[] = { Side ? WHITE_OOO : WHITE_OO, - Side ? BLACK_OOO : BLACK_OO }; + MoveStack* generate_castle(const Position& pos, MoveStack* mlist, Color us) { - if (!pos.can_castle(CR[us])) + if (pos.castle_impeded(us, Side) || !pos.can_castle(make_castle_right(us, Side))) 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 rfrom = pos.castle_rook_square(us, Side); 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)) + if ( s != kfrom // We are not in check + && (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) + if ( pos.is_chess960() + && (pos.attackers_to(kto, pos.pieces() ^ rfrom) & enemies)) return mlist; - } - (*mlist++).move = make_castle(kfrom, rfrom); + (*mlist++).move = make(kfrom, rfrom); if (OnlyChecks && !pos.move_gives_check((mlist - 1)->move, CheckInfo(pos))) mlist--; @@ -96,11 +76,11 @@ namespace { : 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; + : Delta == DELTA_SW ? (p & ~FileABB) >> 9 : 0; } - template + template inline MoveStack* generate_promotions(MoveStack* mlist, Bitboard pawnsOn7, Bitboard target, Square ksq) { Bitboard b = move_pawns(pawnsOn7) & target; @@ -109,20 +89,20 @@ namespace { { Square to = pop_1st_bit(&b); - if (Type == MV_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION) - (*mlist++).move = make_promotion(to - Delta, to, QUEEN); + if (Type == CAPTURES || Type == EVASIONS || Type == NON_EVASIONS) + (*mlist++).move = make(to - Delta, to, QUEEN); - if (Type == MV_NON_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION) + if (Type == QUIETS || Type == EVASIONS || Type == NON_EVASIONS) { - (*mlist++).move = make_promotion(to - Delta, to, ROOK); - (*mlist++).move = make_promotion(to - Delta, to, BISHOP); - (*mlist++).move = make_promotion(to - Delta, to, KNIGHT); + (*mlist++).move = make(to - Delta, to, ROOK); + (*mlist++).move = make(to - Delta, to, BISHOP); + (*mlist++).move = make(to - Delta, to, KNIGHT); } - // Knight-promotion is the only one that can give a check (direct or - // discovered) not already included in the queen-promotion. - if (Type == MV_NON_CAPTURE_CHECK && bit_is_set(StepAttacksBB[W_KNIGHT][to], ksq)) - (*mlist++).move = make_promotion(to - Delta, to, KNIGHT); + // Knight-promotion is the only one that can give a direct check not + // already included in the queen-promotion. + if (Type == QUIET_CHECKS && (StepAttacksBB[W_KNIGHT][to] & ksq)) + (*mlist++).move = make(to - Delta, to, KNIGHT); else (void)ksq; // Silence a warning under MSVC } @@ -131,10 +111,10 @@ namespace { } - template + template MoveStack* generate_pawn_moves(const Position& pos, MoveStack* mlist, Bitboard target, Square ksq = SQ_NONE) { - // Calculate our parametrized parameters at compile time, named according to + // Compute our parametrized parameters at compile time, named according to // the point of view of white side. const Color Them = (Us == WHITE ? BLACK : WHITE); const Bitboard TRank8BB = (Us == WHITE ? Rank8BB : Rank1BB); @@ -146,27 +126,27 @@ namespace { Bitboard b1, b2, dc1, dc2, emptySquares; - Bitboard pawnsOn7 = pos.pieces(PAWN, Us) & TRank7BB; - Bitboard pawnsNotOn7 = pos.pieces(PAWN, Us) & ~TRank7BB; + Bitboard pawnsOn7 = pos.pieces(Us, PAWN) & TRank7BB; + Bitboard pawnsNotOn7 = pos.pieces(Us, PAWN) & ~TRank7BB; - Bitboard enemies = (Type == MV_EVASION ? pos.pieces(Them) & target: - Type == MV_CAPTURE ? target : pos.pieces(Them)); + Bitboard enemies = (Type == EVASIONS ? pos.pieces(Them) & target: + Type == CAPTURES ? target : pos.pieces(Them)); // Single and double pawn pushes, no promotions - if (Type != MV_CAPTURE) + if (Type != CAPTURES) { - emptySquares = (Type == MV_NON_CAPTURE ? target : pos.empty_squares()); + emptySquares = (Type == QUIETS ? target : ~pos.pieces()); b1 = move_pawns(pawnsNotOn7) & emptySquares; b2 = move_pawns(b1 & TRank3BB) & emptySquares; - if (Type == MV_EVASION) // Consider only blocking squares + if (Type == EVASIONS) // Consider only blocking squares { b1 &= target; b2 &= target; } - if (Type == MV_NON_CAPTURE_CHECK) + if (Type == QUIET_CHECKS) { b1 &= pos.attacks_from(ksq, Them); b2 &= pos.attacks_from(ksq, Them); @@ -190,12 +170,12 @@ namespace { } // Promotions and underpromotions - if (pawnsOn7 && (Type != MV_EVASION || (target & TRank8BB))) + if (pawnsOn7 && (Type != EVASIONS || (target & TRank8BB))) { - if (Type == MV_CAPTURE) - emptySquares = pos.empty_squares(); + if (Type == CAPTURES) + emptySquares = ~pos.pieces(); - if (Type == MV_EVASION) + if (Type == EVASIONS) emptySquares &= target; mlist = generate_promotions(mlist, pawnsOn7, enemies, ksq); @@ -204,7 +184,7 @@ namespace { } // Standard and en-passant captures - if (Type == MV_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION) + if (Type == CAPTURES || Type == EVASIONS || Type == NON_EVASIONS) { b1 = move_pawns(pawnsNotOn7) & enemies; b2 = move_pawns(pawnsNotOn7) & enemies; @@ -219,7 +199,7 @@ namespace { // An en passant capture can be an evasion only if the checking piece // is the double pushed pawn and so is in the target. Otherwise this // is a discovery check and we are forced to do otherwise. - if (Type == MV_EVASION && !bit_is_set(target, pos.ep_square() - UP)) + if (Type == EVASIONS && !(target & (pos.ep_square() - UP))) return mlist; b1 = pawnsNotOn7 & pos.attacks_from(pos.ep_square(), Them); @@ -227,7 +207,7 @@ namespace { assert(b1); while (b1) - (*mlist++).move = make_enpassant(pop_1st_bit(&b1), pos.ep_square()); + (*mlist++).move = make(pop_1st_bit(&b1), pos.ep_square()); } } @@ -240,55 +220,56 @@ namespace { Color us, const CheckInfo& ci) { assert(Pt != KING && Pt != PAWN); + Bitboard b, target; Square from; const Square* pl = pos.piece_list(us, Pt); - if ((from = *pl++) == SQ_NONE) - return mlist; - - Bitboard checkSqs = ci.checkSq[Pt] & pos.empty_squares(); - - do + if (*pl != SQ_NONE) { - if ( (Pt == BISHOP || Pt == ROOK || Pt == QUEEN) - && !(PseudoAttacks[Pt][from] & checkSqs)) - continue; + target = ci.checkSq[Pt] & ~pos.pieces(); // Non capture checks only + + do { + from = *pl; - if (ci.dcCandidates && bit_is_set(ci.dcCandidates, from)) - continue; + if ( (Pt == BISHOP || Pt == ROOK || Pt == QUEEN) + && !(PseudoAttacks[Pt][from] & target)) + continue; - Bitboard b = pos.attacks_from(from) & checkSqs; - SERIALIZE(b); + if (ci.dcCandidates && (ci.dcCandidates & from)) + continue; - } while ((from = *pl++) != SQ_NONE); + b = pos.attacks_from(from) & target; + SERIALIZE(b); + } while (*++pl != SQ_NONE); + } return mlist; } template - FORCE_INLINE MoveStack* generate_piece_moves(const Position& pos, MoveStack* mlist, Color us, Bitboard target) { + FORCE_INLINE MoveStack* generate_moves(const Position& pos, MoveStack* mlist, + Color us, Bitboard target) { + assert(Pt != KING && Pt != PAWN); Bitboard b; Square from; const Square* pl = pos.piece_list(us, Pt); if (*pl != SQ_NONE) - { do { from = *pl; b = pos.attacks_from(from) & target; SERIALIZE(b); } while (*++pl != SQ_NONE); - } return mlist; } template<> - FORCE_INLINE MoveStack* generate_piece_moves(const Position& pos, MoveStack* mlist, Color us, Bitboard target) { - + FORCE_INLINE MoveStack* generate_moves(const Position& pos, MoveStack* mlist, + Color us, Bitboard target) { Square from = pos.king_square(us); Bitboard b = pos.attacks_from(from) & target; SERIALIZE(b); @@ -298,61 +279,61 @@ namespace { } // namespace -/// generate generates all pseudo-legal captures and queen +/// generate generates all pseudo-legal captures and queen /// promotions. Returns a pointer to the end of the move list. /// -/// generate generates all pseudo-legal non-captures and +/// generate generates all pseudo-legal non-captures and /// underpromotions. Returns a pointer to the end of the move list. /// -/// generate generates all pseudo-legal captures and +/// generate generates all pseudo-legal captures and /// non-captures. Returns a pointer to the end of the move list. -template +template MoveStack* generate(const Position& pos, MoveStack* mlist) { - assert(Type == MV_CAPTURE || Type == MV_NON_CAPTURE || Type == MV_NON_EVASION); + assert(Type == CAPTURES || Type == QUIETS || Type == NON_EVASIONS); assert(!pos.in_check()); Color us = pos.side_to_move(); Bitboard target; - if (Type == MV_CAPTURE) + if (Type == CAPTURES) target = pos.pieces(~us); - else if (Type == MV_NON_CAPTURE) - target = pos.empty_squares(); + else if (Type == QUIETS) + target = ~pos.pieces(); - else if (Type == MV_NON_EVASION) - target = pos.pieces(~us) | pos.empty_squares(); + else if (Type == NON_EVASIONS) + target = ~pos.pieces(us); mlist = (us == WHITE ? generate_pawn_moves(pos, mlist, target) : generate_pawn_moves(pos, mlist, target)); - mlist = generate_piece_moves(pos, mlist, us, target); - mlist = generate_piece_moves(pos, mlist, us, target); - mlist = generate_piece_moves(pos, mlist, us, target); - mlist = generate_piece_moves(pos, mlist, us, target); - mlist = generate_piece_moves(pos, mlist, us, target); + mlist = generate_moves(pos, mlist, us, target); + mlist = generate_moves(pos, mlist, us, target); + mlist = generate_moves(pos, mlist, us, target); + mlist = generate_moves(pos, mlist, us, target); + mlist = generate_moves(pos, mlist, us, target); - if (Type != MV_CAPTURE && pos.can_castle(us)) + if (Type != CAPTURES && pos.can_castle(us)) { - mlist = generate_castle_moves(pos, mlist, us); - mlist = generate_castle_moves(pos, mlist, us); + mlist = generate_castle(pos, mlist, us); + mlist = generate_castle(pos, mlist, us); } return mlist; } // Explicit template instantiations -template MoveStack* generate(const Position& pos, MoveStack* mlist); -template MoveStack* generate(const Position& pos, MoveStack* mlist); -template MoveStack* generate(const Position& pos, MoveStack* mlist); +template MoveStack* generate(const Position& pos, MoveStack* mlist); +template MoveStack* generate(const Position& pos, MoveStack* mlist); +template MoveStack* generate(const Position& pos, MoveStack* mlist); -/// generate generates all pseudo-legal non-captures and knight +/// generate generates all pseudo-legal non-captures and knight /// underpromotions that give check. Returns a pointer to the end of the move list. template<> -MoveStack* generate(const Position& pos, MoveStack* mlist) { +MoveStack* generate(const Position& pos, MoveStack* mlist) { assert(!pos.in_check()); @@ -368,7 +349,7 @@ MoveStack* generate(const Position& pos, MoveStack* mlist) if (pt == PAWN) continue; // Will be generated togheter with direct checks - Bitboard b = pos.attacks_from(Piece(pt), from) & pos.empty_squares(); + Bitboard b = pos.attacks_from(Piece(pt), from) & ~pos.pieces(); if (pt == KING) b &= ~PseudoAttacks[QUEEN][ci.ksq]; @@ -376,8 +357,8 @@ MoveStack* generate(const Position& pos, MoveStack* mlist) SERIALIZE(b); } - mlist = (us == WHITE ? generate_pawn_moves(pos, mlist, ci.dcCandidates, ci.ksq) - : generate_pawn_moves(pos, mlist, ci.dcCandidates, ci.ksq)); + mlist = (us == WHITE ? generate_pawn_moves(pos, mlist, ci.dcCandidates, ci.ksq) + : generate_pawn_moves(pos, mlist, ci.dcCandidates, ci.ksq)); mlist = generate_direct_checks(pos, mlist, us, ci); mlist = generate_direct_checks(pos, mlist, us, ci); @@ -386,18 +367,18 @@ MoveStack* generate(const Position& pos, MoveStack* mlist) if (pos.can_castle(us)) { - mlist = generate_castle_moves(pos, mlist, us); - mlist = generate_castle_moves(pos, mlist, us); + mlist = generate_castle(pos, mlist, us); + mlist = generate_castle(pos, mlist, us); } return mlist; } -/// generate generates all pseudo-legal check evasions when the side +/// generate generates all pseudo-legal check evasions when the side /// to move is in check. Returns a pointer to the end of the move list. template<> -MoveStack* generate(const Position& pos, MoveStack* mlist) { +MoveStack* generate(const Position& pos, MoveStack* mlist) { assert(pos.in_check()); @@ -429,7 +410,7 @@ MoveStack* generate(const Position& pos, MoveStack* mlist) { // If queen and king are far or not on a diagonal line we can safely // remove all the squares attacked in the other direction becuase are // not reachable by the king anyway. - if (squares_between(ksq, checksq) || !bit_is_set(PseudoAttacks[BISHOP][checksq], ksq)) + if (between_bb(ksq, checksq) || !(PseudoAttacks[BISHOP][checksq] & ksq)) sliderAttacks |= PseudoAttacks[QUEEN][checksq]; // Otherwise we need to use real rook attacks to check if king is safe @@ -453,28 +434,28 @@ MoveStack* generate(const Position& pos, MoveStack* mlist) { return mlist; // Blocking evasions or captures of the checking piece - target = squares_between(checksq, ksq) | checkers; + target = between_bb(checksq, ksq) | checkers; - mlist = (us == WHITE ? generate_pawn_moves(pos, mlist, target) - : generate_pawn_moves(pos, mlist, target)); + mlist = (us == WHITE ? generate_pawn_moves(pos, mlist, target) + : generate_pawn_moves(pos, mlist, target)); - mlist = generate_piece_moves(pos, mlist, us, target); - mlist = generate_piece_moves(pos, mlist, us, target); - mlist = generate_piece_moves(pos, mlist, us, target); - return generate_piece_moves(pos, mlist, us, target); + mlist = generate_moves(pos, mlist, us, target); + mlist = generate_moves(pos, mlist, us, target); + mlist = generate_moves(pos, mlist, us, target); + return generate_moves(pos, mlist, us, target); } -/// generate generates all the legal moves in the given position +/// generate generates all the legal moves in the given position template<> -MoveStack* generate(const Position& pos, MoveStack* mlist) { +MoveStack* generate(const Position& pos, MoveStack* mlist) { MoveStack *last, *cur = mlist; Bitboard pinned = pos.pinned_pieces(); - last = pos.in_check() ? generate(pos, mlist) - : generate(pos, mlist); + last = pos.in_check() ? generate(pos, mlist) + : generate(pos, mlist); while (cur != last) if (!pos.pl_move_is_legal(cur->move, pinned)) cur->move = (--last)->move;