public bool IsLegalEpMove(int fromIndex)
{
if (EpIndex == 0)
{
// required for tt-moves
return(false);
}
// do-move and hit
Pieces[ColorToMoveInverse][Pawn] ^= Util.PowerLookup[EpIndex + ColorFactor8[ColorToMoveInverse]];
// check if is in check
var isInCheck = CheckUtil.IsInCheck(KingIndex[ColorToMove], ColorToMove, Pieces[ColorToMoveInverse],
(Pieces[ColorToMove][All] ^ Util.PowerLookup[fromIndex] ^ Util.PowerLookup[EpIndex])
| (Pieces[ColorToMoveInverse][All] ^ Util.PowerLookup[EpIndex + ColorFactor8[ColorToMoveInverse]]));
// undo-move and hit
Pieces[ColorToMoveInverse][Pawn] |= Util.PowerLookup[EpIndex + ColorFactor8[ColorToMoveInverse]];
return(!isInCheck);
}
private bool IsLegalNonKingMove(int move)
{
return(!CheckUtil.IsInCheck(KingIndex[ColorToMove], ColorToMove, Pieces[ColorToMoveInverse],
AllPieces ^ Util.PowerLookup[MoveUtil.GetFromIndex(move)] ^
Util.PowerLookup[MoveUtil.GetToIndex(move)]));
}
private bool IsLegalKingMove(int move)
{
return(!CheckUtil.IsInCheckIncludingKing(MoveUtil.GetToIndex(move), ColorToMove, Pieces[ColorToMoveInverse],
AllPieces ^ Util.PowerLookup[MoveUtil.GetFromIndex(move)]));
}