Monthly Archives: November 2021

Softening left page ultrahardcore 353

Posted on November 30, 2021 by Sudent

Here is another puzzle the DIY oriented solvers suggest is too hard for human solving, even as the moves they find are too instructive to ignore.  This post gets quickly to ALS methods that demand exhaustive enumeration from the DIY … Continue reading →

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UHC 309 Rounds the Bases

Posted on November 23, 2021 by Sudent

The ultrahardcore review solvers illustrate a diverse solution path, before and after AIC and cluster building. Here is the grid after the bypass and box marking. Beeby found a naked single SE4 in r8c7 in its basic. The Sysudoku Basic … Continue reading →

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The UHC 265 Wrap Up

Posted on November 16, 2021 by Sudent

This post continues on the solution path for left page ultrahardcore 265. We begin where we left off, with the two solvers synchronized and with the first preliminary coloring cluster on the grid. Next, a 3 – ANL creates a … Continue reading →

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Two Solvers Play With UHC 265

Posted on November 9, 2021 by Sudent

Heine’s left page ultrahardcore 265 is solved in two posts. This post follows the alternative methods of the review solvers Beeby and Sudokuwiki until they converge on a long series of AIC in the second post. Here is the grid … Continue reading →

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An ultrahardcore 221 ALS AIC Clinic

Posted on November 2, 2021 by Sudent

Continuing a solution path with a finned starfish (5 lines), Beeby carries us through an unlikely  series of ALS aided AIC, dancing around two stalled coloring clusters. The contest ends with regular AIC finally expanding and wrapping the clusters. Here … Continue reading →

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