Monthly Archives: September 2021

Wrapping Up UHC 89


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


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


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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