private void UndoMove(Position source, Position target, Piece capturedPiece)
{
ChessPiece p = (ChessPiece)_board.RemovePiece(target);
p.DecreaseMoveCount();
_board.PlacePiece(p, source);
if (capturedPiece != null)
{
_board.PlacePiece(capturedPiece, target);
_piecesOnTheBoard.Add(capturedPiece);
_capturedPieces.Remove(capturedPiece);
}
// #specialmove castling kingside rook
if (p is King && target.Column == source.Column + 2)
{
Position origemT = new Position(source.Row, source.Column + 3);
Position destinoT = new Position(source.Row, source.Column + 1);
ChessPiece rook = (ChessPiece)_board.RemovePiece(destinoT);
rook.DecreaseMoveCount();
_board.PlacePiece(rook, origemT);
}
// #specialmove castling queenside rook
if (p is King && target.Column == source.Column - 2)
{
Position origemT = new Position(source.Row, source.Column - 4);
Position destinoT = new Position(source.Row, source.Column - 1);
ChessPiece rook = (ChessPiece)_board.RemovePiece(destinoT);
rook.DecreaseMoveCount();
_board.PlacePiece(rook, origemT);
}
// #specialmove en passant
if (p is Pawn)
{
if (source.Column != target.Column && capturedPiece == EnPassantVulnerable)
{
ChessPiece pawn = (ChessPiece)_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);
}
}
}