public bool SelectChessPiece(int x, int y)
{
if (selectedChessPiece == null && chessBoard[x, y] == null)
{
return(false);
}
else if (chessBoard[x, y].Color != playerTurn)
{
return(false);
}
selectedChessPiece = chessBoard[x, y];
highlightChessPieceMoves = selectedChessPiece.PossibleMove(chessBoard); // ChessPiece[,] chessBoard.
return(true);
}