CheckerBoard.txt
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        4        10        11         2         1 
        4        12        13         4         3 
        4        14        15         6         5 
        4        16        17         8         7 
        4        20        21        12        11 
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        4        24        25        16        15 
        4        26        27        18        17 
        4        28        29        20        19 
        4        30        31        22        21 
        4        32        33        24        23 
        4        34        35        26        25 
        4        38        39        30        29 
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        4        42        43        34        33 
        4        44        45        36        35 
        4        46        47        38        37 
        4        48        49        40        39 
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        4        58        59        50        49 
        4        60        61        52        51 
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        4        68        69        60        59 
        4        70        71        62        61 
        4        74        75        66        65 
        4        76        77        68        67 
        4        78        79        70        69 
        4        80        81        72        71