public CacheKey(ChessRepresentation chessRepresentation, ChessPlayer chessPlayer, MoveGeneratorStyle generatorStyle)
{
ChessRepresentation = chessRepresentation.Clone();
ChessPlayer = chessPlayer;
GeneratorStyle = generatorStyle;
}
private ChessRepresentation ApplyMove(ChessRepresentation representationParam, BaseMove move, bool validateMove)
{
if (validateMove && !ValidateMove(representationParam, move))
{
throw new ChessIllegalMoveException();
}
var representation = representationParam.Clone();
// Removing en passant flags if the move wasn't a special move. (Usually DrawOffer)
if (move is BaseChessMove)
{
var pawns = Positions.PositionList.Select(x => representation[x])
.Where(x => x != null)
.Where(x => x.Owner != representation.CurrentPlayer)
.OfType <Pawn>()
.Select(x => x)
.ToArray();
foreach (var pawn in pawns)
{
pawn.IsEnPassantCapturable = false;
}
}
switch (move)
{
case SpecialMove _:
break;
case KingCastlingMove castlingMove:
representation.Move(castlingMove.From, castlingMove.To);
representation.Move(castlingMove.RookFrom, castlingMove.RookTo);
representation[castlingMove.To].HasMoved = true;
representation[castlingMove.RookTo].HasMoved = true;
break;
case PawnEnPassantMove pawnEnPassantMove:
representation.Move(pawnEnPassantMove.From, pawnEnPassantMove.To);
representation[pawnEnPassantMove.CapturePosition] = null;
representation[pawnEnPassantMove.To].HasMoved = true;
break;
case PawnPromotionalMove pawnPromotionalMove:
representation.Move(pawnPromotionalMove.From, pawnPromotionalMove.To);
representation[pawnPromotionalMove.To] = ChessPieces.Create(pawnPromotionalMove.PromoteTo, representation[pawnPromotionalMove.To].Owner);
representation[pawnPromotionalMove.To].HasMoved = true;
break;
case BaseChessMove chessMove:
var movingPiece = representation[chessMove.From];
representation.Move(chessMove.From, chessMove.To);
representation[chessMove.To].HasMoved = true;
// Setting en passant flag if needed
if (movingPiece.Kind == PieceKind.Pawn && Math.Abs(chessMove.From.Row - chessMove.To.Row) == 2 && chessMove.From.Column == chessMove.To.Column)
{
((Pawn)representation[chessMove.To]).IsEnPassantCapturable = true;
}
break;
}
representation.TogglePlayer();
representation.History.Add(move);
return(representation);
}
