Tag Archives: ALS toxic set

World’s 36 and 200 Basic, and More on 25

Posted on May 8, 2018 by

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 →

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The ALS Jump Ball

Posted on June 2, 2015 by

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 →

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Gordon Fick Tricks More Extreme 200

Posted on May 5, 2015 by

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 →

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ALS Toxic Sets

Posted on July 17, 2012 by

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 →

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