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use strict;
use warnings;
...
             #row #col  #list of list of valid moves
our %hash = (0 => 0 => [[[1, 0],[2, 0],[3, 0],[4, 0],[5, 0],[6, 0],[7,
+ 0]],
            [[0, 1],[0, 2],[0, 3],[0, 4],[0, 5],[0, 6],[0, 7]]]);

Odd number of elements in hash assignment

use strict;
use warnings;
...

$hash{0}->{0} = [[[1, 0],[2, 0],[3, 0],[4, 0],[5, 0],[6, 0],[7, 0]],
              [[0, 1],[0, 2],[0, 3],[0, 4],[0, 5],[0, 6],[0, 7]]];