Tag Archives: bypass trace

It’s the Bypass In Hard Sudoku v1 145


I had Will Shortz’Hard Sudoku v.1 145 collapsing in box marking, showing that every phase of Sysudoku Basic is actively solving, not just accumulating candidates for advanced methods later. But in process of writing this up, I discovered that the … Continue reading

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Moito’s I-4 Inspires a Trace Refinement


This post introduces an improved trace convention for 3-fills, in response to a complex of 3-fills in the bypass solution of Very Hard I-4 from Moito’s Sudoku Road to Mastery, the puzzle Moito rates as highest possible difficulty. The bypass … Continue reading

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