examples/hard-2013-07-15.sudoku


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0 0 0  0 0 0  0 0 0
5 0 8  0 0 0  0 0 0
0 0 0  2 0 0  0 0 1

0 0 0  5 0 0  0 9 0
0 0 0  0 0 1  0 0 6
9 0 6  0 0 0  4 0 0

0 3 1  0 0 6  0 0 7
0 0 0  7 2 0  8 0 0
0 8 2  0 9 0  0 0 3