private void UndoMovement(Position origin, Position destination, Piece capturedPiece)
{
Piece piece = Board.RemovePiece(destination);
piece.DecreaseMovementCount();
if (capturedPiece != null)
{
Board.AddPiece(capturedPiece, destination);
Captured.Remove(capturedPiece);
}
Board.AddPiece(piece, origin);
//Special move: Castling
if ((piece is King) && (destination.Column == origin.Column + 2))
{
Position originR = new Position(origin.Row, origin.Column + 3);
Position destinationR = new Position(origin.Row, origin.Column + 1);
Piece R = Board.RemovePiece(destinationR);
R.DecreaseMovementCount();
Board.AddPiece(R, originR);
}
if ((piece is King) && (destination.Column == origin.Column - 2))
{
Position originR = new Position(origin.Row, origin.Column - 4);
Position destinationR = new Position(origin.Row, origin.Column - 1);
Piece R = Board.RemovePiece(destinationR);
R.DecreaseMovementCount();
Board.AddPiece(R, originR);
}
//Special move: En Passant
if (piece is Pawn)
{
if ((origin.Column != destination.Column) && (capturedPiece == VulnerableToEnPassant))
{
Piece pawn = Board.RemovePiece(destination);
Position positionP;
if (piece.Color == Color.White)
{
positionP = new Position(3, destination.Column);
}
else
{
positionP = new Position(4, destination.Column);
}
Board.AddPiece(pawn, positionP);
}
}
}