A randomized Nishio solver's strategy-cycle count correlates strongly with website difficulty labels for four of five Sudoku sites, enabling a three-tier universal difficulty classification.
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Project Patti: Why can You Solve Diabolical Puzzles on one Sudoku Website but not Easy Puzzles on another Sudoku Website?
A randomized Nishio solver's strategy-cycle count correlates strongly with website difficulty labels for four of five Sudoku sites, enabling a three-tier universal difficulty classification.