Tag Archives: ALS toxic set

The ALS Jump Ball


The last review puzzle from the Weekly Extreme Competition, Wex 435, evades the Sue de Coq to give us: a precaution about grouped forcing chains in XYZ-wings, a genuinely extreme patterns trial, and an obvious form of ALS trial to … Continue reading

Posted in Advanced Solving, Extreme Solving, Puzzle Reviews, Weekly Extreme | Tagged , , , , , , , | Leave a comment

Gordon Fick Tricks More Extreme 200


This post reports an alternative solution, without my pattern analysis, to Antoine Alary’s special More Extreme 200, based on a Sysudoku reader’s innovative use of a little known technique, the double common ALS pair. Two ALS sharing two restricted common … Continue reading

Posted in Alary, Extreme Solving, Puzzle Reviews | Tagged , , , , , , | Leave a comment

ALS Toxic Sets


A pair of non intersecting almost locked sets can define a toxic set. This kind of removal may be discovered at any time, but I place closure on ALS generated toxic sets very late in the Systematic Sudoku Order of … Continue reading

Posted in Advanced Solving | Tagged , , | Leave a comment