Tag Archives: ALS_XZ

Beeby Softens Up ultrahardcore 443


This post reports a series of Beeby ALS-XZ featuring alignments in Z and X, almost to the point where a trial is needed. A simple basic trace means a hard start, with a crowded grid. Sudokuwiki’s 579-wing is a Beeby … Continue reading

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An SASdC Trial Defeats ultrahardcore 355


In this post a SASdC trial plays like a regular hard puzzle from other collections. The trial amounts to adding two clues, and seeing  what happens.  But it isn’t guessing, and instead of making a small gain, the trial solves … Continue reading

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A Coloring Trial Weakens ultrahardcore 311


Sorry about last week’s post arriving a week earlly. This week continues the solving of Stefan Heine’s ultrahardcore 311 with a coloring trial, and an enabled Beeby marching to the solution. Here is the trial grid, after the removal of … Continue reading

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Beeby Carries UHC 223 to a Second Cluster


This post reports how the Beeby solver comes to life after the Single Alternate Sue de Coq trial , and nibbles Heine’s ultrahardcore 223 to a second coloring cluster. Beeby notes the ANL isas a simple chain, but it’s AIC … Continue reading

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Two Clues and Pattern Coloring Beat 179


This post carries a pair of clues, gained a trial of an alternative pair of clues,  to a solution to Stefan Heine’s ultrahardcore 179. The resolution requires a pattern analysis on the 5-panel, aided by two coloring clusters. Going back … Continue reading

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A Partial Pattern Trial on ultrahardcore 179


This post starts with the 5-panel freeform  analysis to compare with yours and then moves on with the partial pattern trial suggested in the last post, of 8 patterns containing 8r2c9. My 5-panel patterns are much less promising  than the … Continue reading

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Deeby Hauls ultrahardcore 135 into Court


In this post, Beeby leads the way, but the instructive methods bring us only to a partial value pattern trial. The trial date is next week. After the usual slink marking Sysudoku basic,     ultrahardcore 135 has a busy … Continue reading

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Ultrahardcore 91 Trials Unleash Beeby


Here is the basics launch on Stefan Heine’s ultrahardcore 91, which quickly runs my two assisting solvers out of humanly practical removals. A Single Alternate Sue de Coq  trial reduces two clusters two one, and produces  two critical clues. In … Continue reading

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An ALS Toxic Set Update


This post reviews Sysudoku history on the problem of spotting ALS toxic sets, and presents the updated  recommendation in the ALS Toxic Set page just completed for the Guide.  This spotting process, to be referred to here as ALS partnering, … Continue reading

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Bean Gets No Second Extreme


This post describes how I-41, in Extremely Hard v. 10 by Rebecca Bean comes close, but fails to force a deferred Single Alternate Sue de Coq trial. It does force a review of AIC hinges and grouped forcing chains. An update … Continue reading

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