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Tag Archives: ALS toxic set
World’s 36 and 200 Basic, and More on 25
In this post, checkpoint traces on World’s Hardest 36 and 200, and a direct comparison with two Strmckr solutions to Worlds 25. Also, a Gordon Fick contribution to the cause. Here is Strmckr’s first solution, right out of line marking. It’s … Continue reading
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
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 ALS toxic set, ALS-XZ, Antoine Alary, double common ALS pair, ER ANL, Gordon Fick, remote pair
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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
