Tag Archives: irregular XYZ-wing

The Limited XYZ-wings of THLS


The XYZ-wing is limited in The Hidden Logic of Sudoku, as it generally is in Sudoku literature, by  a limited conception of the weak link.  This post presents a resolution of Royle 17-12407 using an iXYZ-wing, a form of the … Continue reading

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

The KrazyDad Insane Review Begins


This post begins the Sysudoku review of Jim Bumgardner’s toughest collection, the Insane level,  with a demonstration of cluster extension in Medusa coloring, via Limited Pattern Overlay.  The post was updated in 10/18. The first review puzzle is Insane v.4, … Continue reading

Posted in Extreme Solving, KrazyDad, Puzzle Reviews | Tagged , , , , | 1 Comment