Monthly Archives: September 2021

Ultra 133 “Simple” Chains and Discontinuous Loops

Posted on September 28, 2021 by Sudent

After an productive naked triple in line marking, and two bv scan methods, left page ultrahardcore 133 starts AIC building with Beeby “simple” chains. Then we take in two “discontinuous loops, i.e. simple 1-ways. The decisive ALS AIC’s and colorful … Continue reading →

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Wrapping Up UHC 89

Posted on September 21, 2021 by Sudent

This post completes a coloring solution of Stefan Heine’s left page ultrahardcore 89.  Two examples of cluster exit AIC building bring a second finned swordfish, and a cluster exit wrap of the large cluster. After this follow up of last … Continue reading →

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A Box ALS in Left Page UHC 89

Posted on September 14, 2021 by Sudent

In this post, a large box ALS with many outside candidates becomes a starter in AIC building, and a second cluster becomes a AIC target.  Restoring 2r8c7, we continue with an box ALS node AIC chain, using its 5 value … Continue reading →

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UHC 89 Breaks Out from a Monster Basic

Posted on September 7, 2021 by Sudent

This post coordinates the two DIY solvers used in the ultrahardcore review, choosing and interpreting solver methods and ignoring some removals to match the Sysudoku DIY order of battle. A series of early moves breaks the ice for AIC building … Continue reading →

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