X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fmovegen.cpp;h=1e14f59b743bfee385ca02243d6b3ef6dc8333b0;hb=HEAD;hp=64da7359f3b2e80d32c208aa7eb542c34adf873c;hpb=b6b8c62ba517b566facd3297c7bd7f161b891e2b;p=stockfish
diff --git a/src/movegen.cpp b/src/movegen.cpp
index 64da7359..69b8fe6a 100644
--- a/src/movegen.cpp
+++ b/src/movegen.cpp
@@ -1,7 +1,6 @@
/*
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
- Copyright (C) 2004-2008 Tord Romstad (Glaurung author)
- Copyright (C) 2008-2012 Marco Costalba, Joona Kiiski, Tord Romstad
+ Copyright (C) 2004-2024 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
@@ -17,475 +16,241 @@
along with this program. If not, see .
*/
-#include
+#include "movegen.h"
+
#include
+#include
-#include "movegen.h"
+#include "bitboard.h"
#include "position.h"
-/// Simple macro to wrap a very common while loop, no facny, no flexibility,
-/// hardcoded names 'mlist' and 'from'.
-#define SERIALIZE(b) while (b) (*mlist++).move = make_move(from, pop_1st_bit(&b))
+namespace Stockfish {
-/// Version used for pawns, where the 'from' square is given as a delta from the 'to' square
-#define SERIALIZE_PAWNS(b, d) while (b) { Square to = pop_1st_bit(&b); \
- (*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 };
-
- 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
+ExtMove* make_promotions(ExtMove* moveList, [[maybe_unused]] Square to) {
- template
- inline Bitboard move_pawns(Bitboard p) {
+ constexpr bool all = Type == EVASIONS || Type == NON_EVASIONS;
- 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;
- }
+ if constexpr (Type == CAPTURES || all)
+ *moveList++ = Move::make(to - D, to, QUEEN);
-
- template
- inline MoveStack* generate_pawn_captures(MoveStack* mlist, Bitboard pawns, Bitboard target) {
-
- Bitboard b = move_pawns(pawns) & target;
- SERIALIZE_PAWNS(b, -Delta);
- return mlist;
- }
-
-
- template
- inline MoveStack* generate_promotions(MoveStack* mlist, Bitboard pawnsOn7, Bitboard target, Square ksq) {
-
- Bitboard b = move_pawns(pawnsOn7) & target;
-
- while (b)
+ if constexpr ((Type == CAPTURES && Enemy) || (Type == QUIETS && !Enemy) || all)
{
- 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 == MV_NON_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION)
- {
- (*mlist++).move = make_promotion(to - Delta, to, ROOK);
- (*mlist++).move = make_promotion(to - Delta, to, BISHOP);
- (*mlist++).move = make_promotion(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);
- else
- (void)ksq; // Silence a warning under MSVC
+ *moveList++ = Move::make(to - D, to, ROOK);
+ *moveList++ = Move::make(to - D, to, BISHOP);
+ *moveList++ = Move::make(to - D, to, KNIGHT);
}
- return mlist;
- }
-
+ return moveList;
+}
- 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
- // the point of view of white side.
- const Color Them = (Us == WHITE ? BLACK : WHITE);
- const Bitboard TRank7BB = (Us == WHITE ? Rank7BB : Rank2BB);
- const Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB);
- const Square UP = (Us == WHITE ? DELTA_N : DELTA_S);
- const Square RIGHT = (Us == WHITE ? DELTA_NE : DELTA_SW);
- const Square LEFT = (Us == WHITE ? DELTA_NW : DELTA_SE);
+template
+ExtMove* generate_pawn_moves(const Position& pos, ExtMove* moveList, Bitboard target) {
- Bitboard b1, b2, dc1, dc2, emptySquares;
+ constexpr Color Them = ~Us;
+ constexpr Bitboard TRank7BB = (Us == WHITE ? Rank7BB : Rank2BB);
+ constexpr Bitboard TRank3BB = (Us == WHITE ? Rank3BB : Rank6BB);
+ constexpr Direction Up = pawn_push(Us);
+ constexpr Direction UpRight = (Us == WHITE ? NORTH_EAST : SOUTH_WEST);
+ constexpr Direction UpLeft = (Us == WHITE ? NORTH_WEST : SOUTH_EAST);
- Bitboard pawnsOn7 = pos.pieces(PAWN, Us) & TRank7BB;
- Bitboard pawnsNotOn7 = pos.pieces(PAWN, Us) & ~TRank7BB;
+ const Bitboard emptySquares = ~pos.pieces();
+ const Bitboard enemies = Type == EVASIONS ? pos.checkers() : pos.pieces(Them);
- Bitboard enemies = (Type == MV_EVASION ? pos.pieces(Them) & target:
- Type == MV_CAPTURE ? target : pos.pieces(Them));
+ Bitboard pawnsOn7 = pos.pieces(Us, PAWN) & TRank7BB;
+ Bitboard pawnsNotOn7 = pos.pieces(Us, PAWN) & ~TRank7BB;
// Single and double pawn pushes, no promotions
- if (Type != MV_CAPTURE)
+ if constexpr (Type != CAPTURES)
{
- emptySquares = (Type == MV_NON_CAPTURE ? target : pos.empty_squares());
-
- b1 = move_pawns(pawnsNotOn7) & emptySquares;
- b2 = move_pawns(b1 & TRank3BB) & emptySquares;
+ Bitboard b1 = shift(pawnsNotOn7) & emptySquares;
+ Bitboard b2 = shift(b1 & TRank3BB) & emptySquares;
- if (Type == MV_EVASION) // Consider only blocking squares
+ if constexpr (Type == EVASIONS) // Consider only blocking squares
{
b1 &= target;
b2 &= target;
}
- if (Type == MV_NON_CAPTURE_CHECK)
+ while (b1)
{
- // Consider only direct checks
- b1 &= pos.attacks_from(ksq, Them);
- b2 &= pos.attacks_from(ksq, Them);
-
- // Add pawn pushes which give discovered check. This is possible only
- // if the pawn is not on the same file as the enemy king, because we
- // don't generate captures. Note that a possible discovery check
- // promotion has been already generated among captures.
- if (pawnsNotOn7 & target) // Target is dc bitboard
- {
- dc1 = move_pawns(pawnsNotOn7 & target) & emptySquares & ~file_bb(ksq);
- dc2 = move_pawns(dc1 & TRank3BB) & emptySquares;
-
- b1 |= dc1;
- b2 |= dc2;
- }
+ Square to = pop_lsb(b1);
+ *moveList++ = Move(to - Up, to);
}
- SERIALIZE_PAWNS(b1, -UP);
- SERIALIZE_PAWNS(b2, -UP -UP);
+ while (b2)
+ {
+ Square to = pop_lsb(b2);
+ *moveList++ = Move(to - Up - Up, to);
+ }
}
// Promotions and underpromotions
if (pawnsOn7)
{
- if (Type == MV_CAPTURE)
- emptySquares = pos.empty_squares();
+ Bitboard b1 = shift(pawnsOn7) & enemies;
+ Bitboard b2 = shift(pawnsOn7) & enemies;
+ Bitboard b3 = shift(pawnsOn7) & emptySquares;
- if (Type == MV_EVASION)
- emptySquares &= target;
+ if constexpr (Type == EVASIONS)
+ b3 &= target;
- mlist = generate_promotions(mlist, pawnsOn7, enemies, ksq);
- mlist = generate_promotions(mlist, pawnsOn7, enemies, ksq);
- mlist = generate_promotions(mlist, pawnsOn7, emptySquares, ksq);
+ while (b1)
+ moveList = make_promotions(moveList, pop_lsb(b1));
+
+ while (b2)
+ moveList = make_promotions(moveList, pop_lsb(b2));
+
+ while (b3)
+ moveList = make_promotions(moveList, pop_lsb(b3));
}
- // Standard and en-passant captures
- if (Type == MV_CAPTURE || Type == MV_EVASION || Type == MV_NON_EVASION)
+ // Standard and en passant captures
+ if constexpr (Type == CAPTURES || Type == EVASIONS || Type == NON_EVASIONS)
{
- mlist = generate_pawn_captures(mlist, pawnsNotOn7, enemies);
- mlist = generate_pawn_captures(mlist, pawnsNotOn7, enemies);
+ Bitboard b1 = shift(pawnsNotOn7) & enemies;
+ Bitboard b2 = shift(pawnsNotOn7) & enemies;
+
+ while (b1)
+ {
+ Square to = pop_lsb(b1);
+ *moveList++ = Move(to - UpRight, to);
+ }
+
+ while (b2)
+ {
+ Square to = pop_lsb(b2);
+ *moveList++ = Move(to - UpLeft, to);
+ }
if (pos.ep_square() != SQ_NONE)
{
- assert(rank_of(pos.ep_square()) == (Us == WHITE ? RANK_6 : RANK_3));
+ assert(rank_of(pos.ep_square()) == relative_rank(Us, RANK_6));
- // 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))
- return mlist;
+ // An en passant capture cannot resolve a discovered check
+ if (Type == EVASIONS && (target & (pos.ep_square() + Up)))
+ return moveList;
- b1 = pawnsNotOn7 & pos.attacks_from(pos.ep_square(), Them);
+ b1 = pawnsNotOn7 & pawn_attacks_bb(Them, pos.ep_square());
assert(b1);
while (b1)
- (*mlist++).move = make_enpassant(pop_1st_bit(&b1), pos.ep_square());
+ *moveList++ = Move::make(pop_lsb(b1), pos.ep_square());
}
}
- return mlist;
- }
-
+ return moveList;
+}
- template
- inline MoveStack* generate_direct_checks(const Position& pos, MoveStack* mlist,
- Color us, const CheckInfo& ci) {
- assert(Pt != KING && Pt != PAWN);
- Square from;
- const Square* pl = pos.piece_list(us, Pt);
+template
+ExtMove* generate_moves(const Position& pos, ExtMove* moveList, Bitboard target) {
- if ((from = *pl++) == SQ_NONE)
- return mlist;
+ static_assert(Pt != KING && Pt != PAWN, "Unsupported piece type in generate_moves()");
- Bitboard checkSqs = ci.checkSq[Pt] & pos.empty_squares();
+ Bitboard bb = pos.pieces(Us, Pt);
- do
+ while (bb)
{
- if ( (Pt == BISHOP || Pt == ROOK || Pt == QUEEN)
- && !(PseudoAttacks[Pt][from] & checkSqs))
- continue;
-
- if (ci.dcCandidates && bit_is_set(ci.dcCandidates, from))
- continue;
+ Square from = pop_lsb(bb);
+ Bitboard b = attacks_bb(from, pos.pieces()) & target;
- Bitboard b = pos.attacks_from(from) & checkSqs;
- SERIALIZE(b);
+ while (b)
+ *moveList++ = Move(from, pop_lsb(b));
+ }
- } while ((from = *pl++) != SQ_NONE);
+ return moveList;
+}
- return mlist;
- }
+template
+ExtMove* generate_all(const Position& pos, ExtMove* moveList) {
- template
- FORCE_INLINE MoveStack* generate_piece_moves(const Position& pos, MoveStack* mlist, Color us, Bitboard target) {
+ static_assert(Type != LEGAL, "Unsupported type in generate_all()");
- Bitboard b;
- Square from;
- const Square* pl = pos.piece_list(us, Pt);
+ const Square ksq = pos.square(Us);
+ Bitboard target;
- if (*pl != SQ_NONE)
+ // Skip generating non-king moves when in double check
+ if (Type != EVASIONS || !more_than_one(pos.checkers()))
{
- do {
- from = *pl;
- b = pos.attacks_from(from) & target;
- SERIALIZE(b);
- } while (*++pl != SQ_NONE);
+ target = Type == EVASIONS ? between_bb(ksq, lsb(pos.checkers()))
+ : Type == NON_EVASIONS ? ~pos.pieces(Us)
+ : Type == CAPTURES ? pos.pieces(~Us)
+ : ~pos.pieces(); // QUIETS
+
+ moveList = generate_pawn_moves(pos, moveList, target);
+ moveList = generate_moves(pos, moveList, target);
+ moveList = generate_moves(pos, moveList, target);
+ moveList = generate_moves(pos, moveList, target);
+ moveList = generate_moves(pos, moveList, target);
}
- return mlist;
- }
-
-
- template<>
- FORCE_INLINE MoveStack* generate_piece_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);
- return mlist;
- }
-
-} // namespace
-
+ Bitboard b = attacks_bb(ksq) & (Type == EVASIONS ? ~pos.pieces(Us) : target);
-/// 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
-/// underpromotions. Returns a pointer to the end of the move list.
-///
-/// generate generates all pseudo-legal captures and
-/// non-captures. Returns a pointer to the end of the move list.
-
-template
-MoveStack* generate(const Position& pos, MoveStack* mlist) {
-
- assert(Type == MV_CAPTURE || Type == MV_NON_CAPTURE || Type == MV_NON_EVASION);
- assert(!pos.in_check());
-
- Color us = pos.side_to_move();
- Bitboard target;
-
- if (Type == MV_CAPTURE)
- target = pos.pieces(~us);
-
- else if (Type == MV_NON_CAPTURE)
- target = pos.empty_squares();
-
- else if (Type == MV_NON_EVASION)
- target = pos.pieces(~us) | pos.empty_squares();
-
- 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);
+ while (b)
+ *moveList++ = Move(ksq, pop_lsb(b));
- if (Type != MV_CAPTURE && pos.can_castle(us))
- {
- mlist = generate_castle_moves(pos, mlist, us);
- mlist = generate_castle_moves(pos, mlist, us);
- }
+ if ((Type == QUIETS || Type == NON_EVASIONS) && pos.can_castle(Us & ANY_CASTLING))
+ for (CastlingRights cr : {Us & KING_SIDE, Us & QUEEN_SIDE})
+ if (!pos.castling_impeded(cr) && pos.can_castle(cr))
+ *moveList++ = Move::make(ksq, pos.castling_rook_square(cr));
- return mlist;
+ return moveList;
}
-// 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);
-
-
-/// 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) {
-
- assert(!pos.in_check());
-
- Color us = pos.side_to_move();
- CheckInfo ci(pos);
- Bitboard dc = ci.dcCandidates;
-
- while (dc)
- {
- Square from = pop_1st_bit(&dc);
- PieceType pt = type_of(pos.piece_on(from));
-
- if (pt == PAWN)
- continue; // Will be generated togheter with direct checks
-
- Bitboard b = pos.attacks_from(Piece(pt), from) & pos.empty_squares();
+} // namespace
- if (pt == KING)
- b &= ~PseudoAttacks[QUEEN][ci.ksq];
- SERIALIZE(b);
- }
+// Generates all pseudo-legal captures plus queen promotions
+// Generates all pseudo-legal non-captures and underpromotions
+// Generates all pseudo-legal check evasions
+// Generates all pseudo-legal captures and non-captures
+//
+// Returns a pointer to the end of the move list.
+template
+ExtMove* generate(const Position& pos, ExtMove* moveList) {
- mlist = (us == WHITE ? generate_pawn_moves(pos, mlist, ci.dcCandidates, ci.ksq)
- : generate_pawn_moves(pos, mlist, ci.dcCandidates, ci.ksq));
+ static_assert(Type != LEGAL, "Unsupported type in generate()");
+ assert((Type == EVASIONS) == bool(pos.checkers()));
- mlist = generate_direct_checks(pos, mlist, us, ci);
- mlist = generate_direct_checks(pos, mlist, us, ci);
- mlist = generate_direct_checks(pos, mlist, us, ci);
- mlist = generate_direct_checks(pos, mlist, us, ci);
+ Color us = pos.side_to_move();
- if (pos.can_castle(us))
- {
- mlist = generate_castle_moves(pos, mlist, us);
- mlist = generate_castle_moves(pos, mlist, us);
- }
-
- return mlist;
+ return us == WHITE ? generate_all(pos, moveList)
+ : generate_all(pos, moveList);
}
-
-/// 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) {
-
- assert(pos.in_check());
-
- Bitboard b, target;
- Square from, checksq;
- int checkersCnt = 0;
- Color us = pos.side_to_move();
- Square ksq = pos.king_square(us);
- Bitboard sliderAttacks = 0;
- Bitboard checkers = pos.checkers();
-
- assert(checkers);
-
- // Find squares attacked by slider checkers, we will remove them from the king
- // evasions so to skip known illegal moves avoiding useless legality check later.
- b = checkers;
- do
- {
- checkersCnt++;
- checksq = pop_1st_bit(&b);
-
- assert(color_of(pos.piece_on(checksq)) == ~us);
-
- switch (type_of(pos.piece_on(checksq)))
- {
- case BISHOP: sliderAttacks |= PseudoAttacks[BISHOP][checksq]; break;
- case ROOK: sliderAttacks |= PseudoAttacks[ROOK][checksq]; break;
- case QUEEN:
- // 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))
- sliderAttacks |= PseudoAttacks[QUEEN][checksq];
-
- // Otherwise we need to use real rook attacks to check if king is safe
- // to move in the other direction. For example: king in B2, queen in A1
- // a knight in B1, and we can safely move to C1.
- else
- sliderAttacks |= PseudoAttacks[BISHOP][checksq] | pos.attacks_from(checksq);
-
- default:
- break;
- }
- } while (b);
-
- // Generate evasions for king, capture and non capture moves
- b = pos.attacks_from(ksq) & ~pos.pieces(us) & ~sliderAttacks;
- from = ksq;
- SERIALIZE(b);
-
- // Generate evasions for other pieces only if not under a double check
- if (checkersCnt > 1)
- return mlist;
-
- // Blocking evasions or captures of the checking piece
- target = squares_between(checksq, ksq) | checkers;
-
- 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);
-}
+// Explicit template instantiations
+template ExtMove* generate(const Position&, ExtMove*);
+template ExtMove* generate(const Position&, ExtMove*);
+template ExtMove* generate(const Position&, ExtMove*);
+template ExtMove* generate(const Position&, ExtMove*);
-/// 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 *last, *cur = mlist;
- Bitboard pinned = pos.pinned_pieces();
-
- 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;
- else
- cur++;
+ExtMove* generate(const Position& pos, ExtMove* moveList) {
+
+ Color us = pos.side_to_move();
+ Bitboard pinned = pos.blockers_for_king(us) & pos.pieces(us);
+ Square ksq = pos.square(us);
+ ExtMove* cur = moveList;
+
+ moveList =
+ pos.checkers() ? generate(pos, moveList) : generate(pos, moveList);
+ while (cur != moveList)
+ if (((pinned & cur->from_sq()) || cur->from_sq() == ksq || cur->type_of() == EN_PASSANT)
+ && !pos.legal(*cur))
+ *cur = *(--moveList);
+ else
+ ++cur;
- return last;
+ return moveList;
}
+
+} // namespace Stockfish