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Puzzle:
         Samples:

Calculation in progress...
Step: {{(step+1).toLocaleString('en-US')}} / {{stepMax.toLocaleString('en-US')}}
Recursion depth: {{board[1]}}

{{ board[0][(yy * 3 + y) * 9 + xx * 3 + x] == '0' ? '' : board[0][(yy * 3 + y) * 9 + xx * 3 + x] }}



Algorithm: