Tag Archives: hidden singles

A Hidden Single Dispatches Beware 165


This post continues a review of Will Shortz’ Hard Sudoku, v.1. with the sixth of ten pre-selected puzzles. Each one is resolved at the basic level. The detailed review requires time and patience,   but its value is the detailed examples … 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

Posted in Basic Solving Procedures, Berthier, Expert Reviews | Tagged , , , , | 6 Comments