private void UndoMove(Position source, Position target, Piece capturedPiece)
{
Piece p = Board.RemovePiece(target);
p.DecreaseMoveCount();
if (capturedPiece != null)
{
Board.PlacePiece(capturedPiece, target);
Captured.Remove(capturedPiece);
}
Board.PlacePiece(p, source);
// #Special move - Castling - Kingside Rook
if (p is King && target.Column == source.Column + 2)
{
Position rookSource = new Position(source.Row, source.Column + 3);
Position rookTarget = new Position(source.Row, source.Column + 1);
Piece rook = Board.RemovePiece(rookTarget);
rook.DecreaseMoveCount();
Board.PlacePiece(rook, rookSource);
}
// #Special move - Castling - Queenside Rook
if (p is King && target.Column == source.Column - 2)
{
Position rookSource = new Position(source.Row, source.Column - 4);
Position rookTarget = new Position(source.Row, source.Column - 1);
Piece rook = Board.RemovePiece(rookTarget);
rook.DecreaseMoveCount();
Board.PlacePiece(rook, rookSource);
}
// #Special move - En Passant
if (p is Pawn)
{
if (source.Column != target.Column && capturedPiece == EnPassantVulnerable)
{
Piece pawn = Board.RemovePiece(target);
Position pawnPosition;
if (p.Color == Color.White)
{
pawnPosition = new Position(3, target.Column);
}
else
{
pawnPosition = new Position(4, target.Column);
}
Board.PlacePiece(pawn, pawnPosition);
}
}
}
