Category Archives: Heine

UHC 397 Fills the Stocking


After two “simple” ANL, Beeby finds a candidate removal by pattern overlay analysis. On PhilsFolly.com, this is requested under “POMs”.  Then a pattern analysis for The Guide offers many more removals using freeforms.   A finned swordfish gets us to coloring, … Continue reading

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An AIC Parade by ultrahardcore 397


This post follows basic with a variety of Alternate Inference Chains. It is an opportunity to compare their effects and corresponding Sysudoku labeling. Three bypass clues, naked triple eliminations, and the line slinks marked in cell corners, that’s the  outcome … Continue reading

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A BARN Storming UHC 353 Finish


This posts finishes left page ultrahardcore 353, using several notable moves to expand a cluster.  Sudokuwiki starts it with a grouped terminal ANL with line and box winks, a regular swordfish expands the cluster, trapping four candidates. Expansion creates an … Continue reading

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Softening left page ultrahardcore 353


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


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


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


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


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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UHC 221 Vies for Right Page ultrahardcore Status


In this post, an unbalanced line marked grid is chiseled down some by an unlikely series of 1-ways and ALS chains by the two DIY oriented solvers. Starting with the bypass grid, with the bypass clues and fill strings in … Continue reading

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UHC 177 Stretches It Out


In this post, Heine’s left page ultrahardcore 177 gets from one cluster wrap to two more in a long series of AIC and boxlines. Also included is the review table for uhc 1 -177. Continuing from the green wrap of … Continue reading

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