Tag Archives: coloring shortcut wink

No THLS Case for Hidden XY Chains


This post and the next demonstrate that the examples presented in The Hidden Logic of Sudoku as requiring “Hidden” XY Chains actually have alternative, and much less demanding, resolution paths in the Sysudoku repertoire.  The burdensome maintenance of symmetry grids is … Continue reading

Posted in Advanced Solving, Berthier, Expert Reviews | Tagged , , , , , , | Leave a comment