Tag Archives: Hidden Logic Sudoku

Hidden Candidates of Hidden Logic


This post calls out the useless reporting scheme in place throughout The Hidden Logic of Sudoku, with a checkpointed hidden triple example that sysudokies have solved as homework. The Akron Tournament final checkpoint is at the end of this report. … Continue reading

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SudoRules’ Hidden Singles Reverse Engineered


Here, Denis Berthier’s trace of a SudoRules basic level puzzle in his The Hidden Logic of Sudoku is reverse engineered to show how it finds hidden singles. Although the method is related to line marking, it is not a practical … Continue reading

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Berthier’s Hidden Logic of Sudoku


This post begins a sysudokie reading of Denis Berthier’s weighty and challenging treatise on Sudoku, The Hidden Logic of Sudoku, or in this report, THLS. I start with an overview of the agenda of the book, which  differs greatly from … Continue reading

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