private static void Demo(IChessBoard board)
{
board.SetPiece(new Tuple <int, int>(0, 7), new Knight(Utils.ColorsEnum.Black, new Tuple <int, int>(0, 7)));
board.ShowBoard();
board.MovePiece(new Tuple <int, int>(0, 7), new Tuple <int, int>(2, 6));
board.ShowBoard();
board.MovePiece(new Tuple <int, int>(0, 7), new Tuple <int, int>(2, 3));
board.ShowBoard();
}