public static byte[] sudoku1 = new byte[81]
        {
            5, 9, 8, 7, 2, 1, 3, 4, 6,
            4, 1, 3, 6, 8, 9, 7, 2, 5,
            2, 7, 6, 4, 5, 3, 1, 8, 9,
            7, 6, 9, 5, 3, 2, 8, 1, 4,
            8, 2, 4, 1, 6, 7, 9, 5, 3,
            1, 3, 5, 9, 4, 8, 2, 6, 7,
            9, 5, 7, 2, 1, 4, 6, 3, 8,
            3, 4, 1, 8, 9, 6, 5, 7, 2,
            6, 8, 2, 3, 7, 5, 4, 9, 1,
        };