private void ValidateSourcePosition(Position sourcePosition)
{
if (!Board.ThereIsAPiece(sourcePosition))
{
throw new ChessException("There is no piece in source position.\n");
}
if (CurrentPlayer != ((ChessPiece)Board.GetPiece(sourcePosition)).Color)
{
throw new ChessException("The piece chosen is not yours.\n");
}
if (!Board.GetPiece(sourcePosition).IsThereAnyPossibleMove())
{
throw new ChessException("There is no possible movements for this piece.\n");
}
}