int partition(int first, int last)
{
// move elements satisfying _Pred to beginning of sequence
for (; ; ++first)
{ // find any out-of-order pair
for (; first != last && (ms[first].score > 0); ++first)
{
; // skip in-place elements at beginning
}
if (first == last)
{
break; // done
}
for (; first != --last && (ms[last].score <= 0);)
{
; // skip in-place elements at end
}
if (first == last)
{
break; // done
}
MoveStack temp = ms[last]; ms[last] = ms[first]; ms[first] = temp;
}
return(first);
}
private static void generate_castle(
int Side,
bool Checks,
Position pos,
MoveStack[] ms,
ref int mpos,
int us)
{
if (pos.castle_impeded(us, Side) || (pos.can_castle_CR(Utils.make_castle_right(us, Side)) == 0))
{
return;
}
// After castling, the rook and king final positions are the same in Chess960
// as they would be in standard chess.
var kfrom = pos.king_square(us);
var rfrom = pos.castle_rook_square(us, Side);
var kto = Utils.relative_square(us, Side == CastlingSideC.KING_SIDE ? SquareC.SQ_G1 : SquareC.SQ_C1);
var enemies = pos.pieces_C(us ^ 1);
Debug.Assert(!pos.in_check());
int K = pos.chess960 ? kto > kfrom ? -1 : 1 : Side == CastlingSideC.KING_SIDE ? -1 : 1;
for (Square s = kto; s != kfrom; s += (Square)K)
{
if ((pos.attackers_to(s) & enemies) != 0)
{
return;
}
}
// 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.chess960 && ((pos.attackers_to(kto, Utils.xor_bit(pos.occupied_squares, rfrom)) & enemies) != 0))
{
return;
}
var m = Utils.make(kfrom, rfrom, MoveTypeC.CASTLING);
if (Checks)
{
var ci = CheckInfoBroker.GetObject();
ci.CreateCheckInfo(pos);
var givesCheck = pos.move_gives_check(m, ci);
CheckInfoBroker.Free();
if (!givesCheck)
{
return;
}
}
ms[mpos++].move = m;
}
int pick_best()
{
int first = curMovePos;
int max = curMovePos;
if (first != lastMovePos)
{
for (; ++first != lastMovePos;)
{
if (ms[max].score < ms[first].score)
{
max = first;
}
}
}
MoveStack temp = ms[curMovePos]; ms[curMovePos] = ms[max]; ms[max] = temp;
return(curMovePos);
}
private static void generate_castle(CastlingSide Side, bool OnlyChecks, Position pos, MoveStack[] ms, ref int mpos, Color us)
{
if (pos.castle_impeded(us, Side) || (pos.can_castle_CR(Utils.make_castle_right(us, Side))==0) )
return;
// 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(us, Side);
Square kto = Utils.relative_square(us, Side == CastlingSideC.KING_SIDE ? SquareC.SQ_G1 : SquareC.SQ_C1);
Bitboard enemies = pos.pieces_C(us ^ 1);
Debug.Assert(!pos.in_check());
for (Square s = Math.Min(kfrom, kto), e = Math.Max(kfrom, kto); s <= e; s++)
if (s != kfrom // We are not in check
&& ((pos.attackers_to(s) & enemies) != 0))
return;
// 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.chess960
&& ((pos.attackers_to(kto, Utils.xor_bit(pos.occupied_squares, rfrom)) & enemies) != 0))
return;
Move m = Utils.make_castle(kfrom, rfrom);
if (OnlyChecks)
{
CheckInfo ci = CheckInfoBroker.GetObject();
ci.CreateCheckInfo(pos);
bool givesCheck = pos.move_gives_check(m, ci);
CheckInfoBroker.Free();
if (!givesCheck) return;
}
ms[mpos++].move = m;
}
internal static void generate_quiet_check(Position pos, MoveStack[] ms, ref int mpos)
{
/// generate<MV_NON_CAPTURE_CHECK> generates all pseudo-legal non-captures and knight
/// underpromotions that give check. Returns a pointer to the end of the move list.
Debug.Assert(!pos.in_check());
var ci = CheckInfoBroker.GetObject();
ci.CreateCheckInfo(pos);
var target = ~pos.occupied_squares;
var dc = ci.dcCandidates;
while (dc != 0)
{
var from = Utils.pop_lsb(ref dc);
var pt = Utils.type_of(pos.piece_on(from));
if (pt == PieceTypeC.PAWN)
{
continue; // Will be generated together with direct checks
}
var b = pos.attacks_from_PTS(pt, from) & ~pos.occupied_squares;
if (pt == PieceTypeC.KING)
{
b &= ~Utils.PseudoAttacks[PieceTypeC.QUEEN][ci.ksq];
}
while (b != 0)
{
ms[mpos++].move = Utils.make_move(from, Utils.pop_lsb(ref b));
}
}
generate_all(GenType.QUIET_CHECKS, pos, ms, ref mpos, pos.sideToMove, target, ci);
CheckInfoBroker.Free();
}
internal static void generate_quiet(Position pos, MoveStack[] ms, ref int mpos)
{
Debug.Assert(!pos.in_check());
var us = pos.sideToMove;
var target = ~pos.occupied_squares;
generate_all(GenType.QUIETS, pos, ms, ref mpos, us, target, null);
}
internal static void generate_legal(Position pos, MoveStack[] ms, ref int mpos)
{
/// generate<LEGAL> generates all the legal moves in the given position
var pinned = pos.pinned_pieces();
Square ksq = pos.king_square(pos.sideToMove);
if (pos.in_check())
{
generate_evasion(pos, ms, ref mpos);
}
else
{
generate_non_evasion(pos, ms, ref mpos);
}
var last = mpos;
var cur = 0;
while (cur != last)
{
var curMove = ms[cur].move;
//if (!pos.pl_move_is_legal(ms[cur].move, pinned))
if ((pinned != 0 || Utils.from_sq(curMove) == ksq || Utils.type_of_move(curMove) == MoveTypeC.ENPASSANT) && !pos.pl_move_is_legal(curMove, pinned))
{
ms[cur].move = ms[--last].move;
}
else
{
cur++;
}
}
mpos = last;
}
internal static void generate_evasion(Position pos, MoveStack[] ms, ref int mpos)
{
/// generate<EVASIONS> generates all pseudo-legal check evasions when the side
/// to move is in check. Returns a pointer to the end of the move list.
Debug.Assert(pos.in_check());
ulong b;
int from, checksq;
var checkersCnt = 0;
var us = pos.sideToMove;
var ksq = pos.king_square(us);
ulong sliderAttacks = 0;
var checkers = pos.st.checkersBB;
Debug.Assert(checkers != 0);
// 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 = Utils.pop_lsb(ref b);
Debug.Assert(Utils.color_of(pos.piece_on(checksq)) == Utils.flip_C(us));
switch (Utils.type_of(pos.piece_on(checksq)))
{
case PieceTypeC.BISHOP:
sliderAttacks |= Utils.PseudoAttacks[PieceTypeC.BISHOP][checksq];
break;
case PieceTypeC.ROOK:
sliderAttacks |= Utils.PseudoAttacks[PieceTypeC.ROOK][checksq];
break;
case PieceTypeC.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 ((Utils.between_bb(ksq, checksq) != 0)
|| ((Utils.bit_is_set(Utils.PseudoAttacks[PieceTypeC.BISHOP][checksq], ksq)) == 0))
{
sliderAttacks |= Utils.PseudoAttacks[PieceTypeC.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 |= Utils.PseudoAttacks[PieceTypeC.BISHOP][checksq]
| pos.attacks_from_ROOK(checksq);
}
break;
default:
break;
}
}
while (b != 0);
// Generate evasions for king, capture and non capture moves
b = Position.attacks_from_KING(ksq) & ~pos.pieces_C(us) & ~sliderAttacks;
from = ksq;
while (b != 0)
{
ms[mpos++].move = Utils.make_move(from, Utils.pop_lsb(ref b));
}
// Generate evasions for other pieces only if not under a double check
if (checkersCnt > 1)
{
return;
}
// Blocking evasions or captures of the checking piece
var target = Utils.between_bb(checksq, ksq) | checkers;
generate_all(GenType.EVASIONS, pos, ms, ref mpos, us, target, null);
}
private static void generate_all(
GenType type,
Position pos,
MoveStack[] mlist,
ref int mpos,
int us,
ulong target,
CheckInfo ci)
{
var Checks = type == GenType.QUIET_CHECKS;
generate_pawn_moves(us, type, pos, mlist, ref mpos, target, ci);
generate_moves(PieceTypeC.KNIGHT, Checks, pos, mlist, ref mpos, us, target, ci);
generate_moves(PieceTypeC.BISHOP, Checks, pos, mlist, ref mpos, us, target, ci);
generate_moves(PieceTypeC.ROOK, Checks, pos, mlist, ref mpos, us, target, ci);
generate_moves(PieceTypeC.QUEEN, Checks, pos, mlist, ref mpos, us, target, ci);
if (!Checks && type != GenType.EVASIONS)
{
Square from = pos.king_square(us);
Bitboard b = Position.attacks_from_KING(from) & target;
// SERIALIZE(b);
while (b != 0)
{
#if X64
Bitboard bb = b;
b &= (b - 1);
mlist[mpos++].move = ((Utils.BSFTable[((bb & (0xffffffffffffffff - bb + 1)) * DeBruijn_64) >> 58]) | (from << 6));
#else
mlist[mpos++].move = Utils.make_move(from, Utils.pop_lsb(ref b));
#endif
}
}
if (type != GenType.CAPTURES && type != GenType.EVASIONS && pos.can_castle_C(us) != 0)
{
generate_castle(CastlingSideC.KING_SIDE, Checks, pos, mlist, ref mpos, us);
generate_castle(CastlingSideC.QUEEN_SIDE, Checks, pos, mlist, ref mpos, us);
}
}
private static void generate_moves(
int Pt,
bool Checks,
Position pos,
MoveStack[] mlist,
ref int mpos,
int us,
ulong target,
CheckInfo ci)
{
Debug.Assert(Pt != PieceTypeC.KING && Pt != PieceTypeC.PAWN);
var pl = pos.pieceList[us][Pt];
var plPos = 0;
for (var from = pl[plPos]; from != SquareC.SQ_NONE; from = pl[++plPos])
{
if (Checks)
{
if ((Pt == PieceTypeC.BISHOP || Pt == PieceTypeC.ROOK || Pt == PieceTypeC.QUEEN)
&& ((Utils.PseudoAttacks[Pt][from] & (ulong)target & ci.checkSq[Pt]) == 0))
{
continue;
}
if ((ci.dcCandidates != 0) && (Utils.bit_is_set(ci.dcCandidates, from) != 0))
{
continue;
}
}
var b = pos.attacks_from_PTS(Pt, from) & (ulong)target;
if (Checks)
{
b &= ci.checkSq[Pt];
}
// SERIALIZE(b);
while (b != 0)
{
mlist[mpos++].move = Utils.make_move(from, Utils.pop_lsb(ref b));
}
}
}
private static void generate_direct_checks(PieceType Pt, Position pos, MoveStack[] ms, ref int mpos, Color us, CheckInfo ci)
{
Debug.Assert(Pt != PieceTypeC.KING && Pt != PieceTypeC.PAWN);
Bitboard b, target;
Square[] pl = pos.pieceList[us][Pt];
int plPos = 0;
Square from = pl[plPos];
if ((from = pl[plPos]) != SquareC.SQ_NONE)
{
target = ci.checkSq[Pt] & ~pos.occupied_squares; // Non capture checks only
do
{
if ((Pt == PieceTypeC.BISHOP || Pt == PieceTypeC.ROOK || Pt == PieceTypeC.QUEEN)
&& ((Utils.PseudoAttacks[Pt][from] & target) == 0))
continue;
if ((ci.dcCandidates != 0) && (Utils.bit_is_set(ci.dcCandidates, from) != 0))
continue;
b = pos.attacks_from_PTS(Pt, from) & target;
while (b != 0) { ms[mpos++].move = Utils.make_move(from, Utils.pop_1st_bit(ref b)); }
} while ((from = pl[++plPos]) != SquareC.SQ_NONE);
}
}
private static void generate_pawn_moves(
int Us,
GenType Type,
Position pos,
MoveStack[] ms,
ref int mpos,
ulong target,
CheckInfo ci)
{
// Compute our parametrized parameters at compile time, named according to
// the point of view of white side.
var Them = (Us == ColorC.WHITE ? ColorC.BLACK : ColorC.WHITE);
var TRank8BB = (Us == ColorC.WHITE ? Constants.Rank8BB : Constants.Rank1BB);
var TRank7BB = (Us == ColorC.WHITE ? Constants.Rank7BB : Constants.Rank2BB);
var TRank3BB = (Us == ColorC.WHITE ? Constants.Rank3BB : Constants.Rank6BB);
var UP = (Us == ColorC.WHITE ? SquareC.DELTA_N : SquareC.DELTA_S);
var RIGHT = (Us == ColorC.WHITE ? SquareC.DELTA_NE : SquareC.DELTA_SW);
var LEFT = (Us == ColorC.WHITE ? SquareC.DELTA_NW : SquareC.DELTA_SE);
ulong b1, b2, dc1, dc2, emptySquares = 0;
int to;
var pawnsOn7 = (pos.byTypeBB[PieceTypeC.PAWN] & pos.byColorBB[Us]) & TRank7BB;
var pawnsNotOn7 = (pos.byTypeBB[PieceTypeC.PAWN] & pos.byColorBB[Us]) & ~TRank7BB;
var enemies = (Type == GenType.EVASIONS
? pos.byColorBB[Them] & target
: Type == GenType.CAPTURES ? target : pos.byColorBB[Them]);
// Single and double pawn pushes, no promotions
if (Type != GenType.CAPTURES)
{
emptySquares = (Type == GenType.QUIETS ? target : ~pos.occupied_squares);
b1 = move_pawns(UP, pawnsNotOn7) & emptySquares;
b2 = move_pawns(UP, b1 & TRank3BB) & emptySquares;
if (Type == GenType.EVASIONS) // Consider only blocking squares
{
b1 &= target;
b2 &= target;
}
if (Type == GenType.QUIET_CHECKS)
{
b1 &= Utils.StepAttacksBB[((Them << 3) | PieceTypeC.PAWN)][ci.ksq];
b2 &= Utils.StepAttacksBB[((Them << 3) | PieceTypeC.PAWN)][ci.ksq];
// 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 & ci.dcCandidates) != 0) // Target is dc bitboard
{
dc1 = move_pawns(UP, pawnsNotOn7 & ci.dcCandidates) & emptySquares & ~(Utils.FileBB[ci.ksq & 7]);
dc2 = move_pawns(UP, dc1 & TRank3BB) & emptySquares;
b1 |= dc1;
b2 |= dc2;
}
}
while (b1 != 0)
{
to = Utils.pop_lsb(ref b1);
ms[mpos++].move = (to | ((to - UP) << 6));
}
while (b2 != 0)
{
to = Utils.pop_lsb(ref b2);
ms[mpos++].move = (to | ((to - UP - UP) << 6));
}
}
// Promotions and underpromotions
if ((pawnsOn7 != 0) && (Type != GenType.EVASIONS || ((target & TRank8BB) != 0)))
{
if (Type == GenType.CAPTURES)
{
emptySquares = ~pos.occupied_squares;
}
if (Type == GenType.EVASIONS)
{
emptySquares &= target;
}
generate_promotions(Type, RIGHT, ms, ref mpos, pawnsOn7, enemies, ci);
generate_promotions(Type, LEFT, ms, ref mpos, pawnsOn7, enemies, ci);
generate_promotions(Type, UP, ms, ref mpos, pawnsOn7, emptySquares, ci);
}
// Standard and en-passant captures
if (Type == GenType.CAPTURES || Type == GenType.EVASIONS || Type == GenType.NON_EVASIONS)
{
b1 = move_pawns(RIGHT, pawnsNotOn7) & enemies;
b2 = move_pawns(LEFT, pawnsNotOn7) & enemies;
while (b1 != 0)
{
to = Utils.pop_lsb(ref b1);
ms[mpos++].move = (to | ((to - RIGHT) << 6));
}
while (b2 != 0)
{
to = Utils.pop_lsb(ref b2);
ms[mpos++].move = (to | ((to - LEFT) << 6));
}
if (pos.st.epSquare != SquareC.SQ_NONE)
{
Debug.Assert(Utils.rank_of(pos.st.epSquare) == Utils.relative_rank_CR(Us, RankC.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 == GenType.EVASIONS && (((target & Utils.SquareBB[pos.st.epSquare - UP]) == 0)))
{
return;
}
b1 = pawnsNotOn7 & Utils.StepAttacksBB[((Them << 3) | PieceTypeC.PAWN)][pos.st.epSquare];
Debug.Assert(b1 != 0);
while (b1 != 0)
{
ms[mpos++].move = Utils.make(Utils.pop_lsb(ref b1), pos.st.epSquare, MoveTypeC.ENPASSANT);
}
}
}
}
internal static void generate_non_evasion(Position pos, MoveStack[] ms, ref int mpos)
{
Debug.Assert(!pos.in_check());
var us = pos.sideToMove;
var target = ~(pos.byColorBB[us]);
generate_all(GenType.NON_EVASIONS, pos, ms, ref mpos, us, target, null);
}
private static void generate_king_moves(Position pos, MoveStack[] ms, ref int mpos, Color us, Bitboard target)
{
Square from = pos.pieceList[us][PieceTypeC.KING][0];
Bitboard b = Utils.StepAttacksBB_KING[from] & target;
while (b != 0)
{
#if X64
Bitboard bb = b;
b &= (b - 1);
ms[mpos++].move = ((Utils.BSFTable[((bb & (0xffffffffffffffff - bb + 1)) * 0x218A392CD3D5DBFUL) >> 58]) | (from << 6));
#else
ms[mpos++].move = Utils.make_move(from, Utils.pop_1st_bit(ref b));
#endif
}
}
internal static void generate_capture(Position pos, MoveStack[] ms, ref int mpos)
{
Debug.Assert(!pos.in_check());
Color us = pos.sideToMove;
Bitboard target = pos.byColorBB[us ^ 1];
generate_pawn_moves(us, MoveType.MV_CAPTURE, pos, ms, ref mpos, target, SquareC.SQ_NONE);
generate_moves(pos, ms, ref mpos, us, target);
generate_king_moves(pos, ms, ref mpos, us, target);
}
internal static void generate_non_evasion(Position pos, MoveStack[] ms, ref int mpos)
{
Debug.Assert(!pos.in_check());
Color us = pos.sideToMove;
Bitboard target = ~(pos.byColorBB[us]);
generate_pawn_moves(us, MoveType.MV_NON_EVASION, pos, ms, ref mpos, target, SquareC.SQ_NONE);
generate_moves(pos, ms, ref mpos, us, target);
generate_king_moves(pos, ms, ref mpos, us, target);
if ((pos.st.castleRights & (CastleRightC.WHITE_ANY << (us << 1))) != 0)
{
generate_castle(CastlingSideC.KING_SIDE, false, pos, ms, ref mpos, us);
generate_castle(CastlingSideC.QUEEN_SIDE, false, pos, ms, ref mpos, us);
}
}
internal static void generate_quiet_check(Position pos, MoveStack[] ms, ref int mpos)
{
/// generate<MV_NON_CAPTURE_CHECK> generates all pseudo-legal non-captures and knight
/// underpromotions that give check. Returns a pointer to the end of the move list.
Debug.Assert(!pos.in_check());
Color us = pos.sideToMove;
CheckInfo ci = CheckInfoBroker.GetObject();
ci.CreateCheckInfo(pos);
Bitboard dc = ci.dcCandidates;
while (dc != 0)
{
Square from = Utils.pop_1st_bit(ref dc);
PieceType pt = Utils.type_of(pos.piece_on(from));
if (pt == PieceTypeC.PAWN)
continue; // Will be generated together with direct checks
Bitboard b = pos.attacks_from_PTS(pt, from) & ~pos.occupied_squares;
if (pt == PieceTypeC.KING)
b &= ~Utils.PseudoAttacks[PieceTypeC.QUEEN][ci.ksq];
while (b != 0) { ms[mpos++].move = Utils.make_move(from, Utils.pop_1st_bit(ref b)); }
}
generate_pawn_moves(us, MoveType.MV_QUIET_CHECK, pos, ms, ref mpos, ci.dcCandidates, ci.ksq);
generate_direct_checks(PieceTypeC.KNIGHT, pos, ms, ref mpos, us, ci);
generate_direct_checks(PieceTypeC.BISHOP, pos, ms, ref mpos, us, ci);
generate_direct_checks(PieceTypeC.ROOK, pos, ms, ref mpos, us, ci);
generate_direct_checks(PieceTypeC.QUEEN, pos, ms, ref mpos, us, ci);
if (pos.can_castle_C(us) != 0)
{
generate_castle(CastlingSideC.KING_SIDE, true, pos, ms, ref mpos, us);
generate_castle(CastlingSideC.QUEEN_SIDE, true, pos, ms, ref mpos, us);
}
CheckInfoBroker.Free();
}
internal static void generate_legal(Position pos, MoveStack[] ms, ref int mpos)
{
/// generate<MV_LEGAL> generates all the legal moves in the given position
Bitboard pinned = pos.pinned_pieces();
if (pos.in_check()) { generate_evasion(pos, ms, ref mpos); }
else { generate_non_evasion(pos, ms, ref mpos); }
int last = mpos;
int cur = 0;
while (cur != last)
{
if (!pos.pl_move_is_legal(ms[cur].move, pinned))
{
ms[cur].move = ms[--last].move;
}
else
{
cur++;
}
}
mpos = last;
}
private static void generate_moves(Position pos, MoveStack[] ms, ref int mpos, Color us, Bitboard target)
{
Bitboard b;
int plPos;
for (PieceType pieceType = PieceTypeC.KNIGHT; pieceType < PieceTypeC.KING; pieceType++)
{
Square[] pl = pos.pieceList[us][pieceType];
Square s = pl[plPos = 0];
if (s != SquareC.SQ_NONE)
{
do
{
#if X64
if (pieceType == PieceTypeC.BISHOP) { b = Utils.BAttacks[s][(((pos.occupied_squares & Utils.BMasks[s]) * Utils.BMagics[s]) >> Utils.BShifts[s])] & target; }
else if (pieceType == PieceTypeC.ROOK) { b = Utils.RAttacks[s][(((pos.occupied_squares & Utils.RMasks[s]) * Utils.RMagics[s]) >> Utils.RShifts[s])] & target; }
else if (pieceType == PieceTypeC.QUEEN) { b = (Utils.BAttacks[s][(((pos.occupied_squares & Utils.BMasks[s]) * Utils.BMagics[s]) >> Utils.BShifts[s])] | Utils.RAttacks[s][(((pos.occupied_squares & Utils.RMasks[s]) * Utils.RMagics[s]) >> Utils.RShifts[s])]) & target; }
else b = Utils.StepAttacksBB[pieceType][s] & target;
while (b != 0)
{
Bitboard bb = b;
b &= (b - 1);
ms[mpos++].move = (Utils.BSFTable[((bb & (0xffffffffffffffff - bb + 1)) * 0x218A392CD3D5DBFUL) >> 58]) | (s << 6);
}
#else
if (pieceType == PieceTypeC.BISHOP) { b = Utils.bishop_attacks_bb(s, pos.occupied_squares) & target; ; }
else if (pieceType == PieceTypeC.ROOK) { b = Utils.rook_attacks_bb(s, pos.occupied_squares) & target; ; }
else if (pieceType == PieceTypeC.QUEEN) { b = (Utils.bishop_attacks_bb(s, pos.occupied_squares) | Utils.rook_attacks_bb(s, pos.occupied_squares)) & target; }
else b = Utils.StepAttacksBB[pieceType][s] & target;
while (b != 0) { ms[mpos++].move = Utils.make_move(s, Utils.pop_1st_bit(ref b)); }
#endif
}
while ((s = pl[++plPos]) != SquareC.SQ_NONE);
}
}
}
internal static void generate_capture(Position pos, MoveStack[] ms, ref int mpos)
{
Debug.Assert(!pos.in_check());
var us = pos.sideToMove;
var target = pos.byColorBB[us ^ 1];
generate_all(GenType.CAPTURES, pos, ms, ref mpos, us, target, null);
}
private static void generate_promotions(MoveType Type, Square Delta, MoveStack[] ms, ref int mpos, Bitboard pawnsOn7, Bitboard target, Square ksq)
{
Bitboard b = move_pawns(Delta, pawnsOn7) & target;
while (b != 0)
{
Square to = Utils.pop_1st_bit(ref b);
if (Type == MoveType.MV_CAPTURE || Type == MoveType.MV_EVASION || Type == MoveType.MV_NON_EVASION)
ms[mpos++].move = Utils.make_promotion(to - Delta, to, PieceTypeC.QUEEN);
if (Type == MoveType.MV_QUIET || Type == MoveType.MV_EVASION || Type == MoveType.MV_NON_EVASION)
{
ms[mpos++].move = Utils.make_promotion(to - Delta, to, PieceTypeC.ROOK);
ms[mpos++].move = Utils.make_promotion(to - Delta, to, PieceTypeC.BISHOP);
ms[mpos++].move = Utils.make_promotion(to - Delta, to, PieceTypeC.KNIGHT);
}
// Knight-promotion is the only one that can give a direct check not
// already included in the queen-promotion.
if (Type == MoveType.MV_QUIET_CHECK && (Utils.bit_is_set(Utils.StepAttacksBB[PieceC.W_KNIGHT][to], ksq) != 0))
ms[mpos++].move = Utils.make_promotion(to - Delta, to, PieceTypeC.KNIGHT);
}
}
internal static void sort(MoveStack[] data, int firstMove, int lastMove)
{
MoveStack tmp;
int p, q;
for (p = firstMove + 1; p < lastMove; p++)
{
tmp = data[p];
for (q = p; q != firstMove && data[q - 1].score < tmp.score; --q)
{
data[q] = data[q - 1];
}
data[q] = tmp;
}
}
private static void generate_promotions(
GenType Type,
int Delta,
MoveStack[] ms,
ref int mpos,
ulong pawnsOn7,
ulong target,
CheckInfo ci)
{
var b = move_pawns(Delta, pawnsOn7) & target;
while (b != 0)
{
var to = Utils.pop_lsb(ref b);
if (Type == GenType.CAPTURES || Type == GenType.EVASIONS || Type == GenType.NON_EVASIONS)
{
ms[mpos++].move = Utils.make(to - Delta, to, MoveTypeC.PROMOTION, PieceTypeC.QUEEN);
}
if (Type == GenType.QUIETS || Type == GenType.EVASIONS || Type == GenType.NON_EVASIONS)
{
ms[mpos++].move = Utils.make(to - Delta, to, MoveTypeC.PROMOTION, PieceTypeC.ROOK);
ms[mpos++].move = Utils.make(to - Delta, to, MoveTypeC.PROMOTION, PieceTypeC.BISHOP);
ms[mpos++].move = Utils.make(to - Delta, to, MoveTypeC.PROMOTION, PieceTypeC.KNIGHT);
}
// Knight-promotion is the only one that can give a direct check not
// already included in the queen-promotion.
if (Type == GenType.QUIET_CHECKS
&& (Utils.bit_is_set(Utils.StepAttacksBB[PieceC.W_KNIGHT][to], ci.ksq) != 0))
{
ms[mpos++].move = Utils.make(to - Delta, to, MoveTypeC.PROMOTION, PieceTypeC.KNIGHT);
}
}
}
