How to define the difficuly of a sudoku puzzle?
Multiple parameters should be taken care of:
As surprising as it may be, two sudoku grids can have the same cells filled with givens and at the same time be totally different, difficulty speaking.
Therefore the conclusion is that the complexity of a puzzle can only be measured in analyzing the methods required to solve it, and this analysis may differ from one person to another. That is what makes Sudoku so interesting!
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