Tag Archives: ALS_XZ

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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Lite Coloring Avoids Trials in KrazyDad 425

Posted on February 2, 2021 by Sudent

This post backs up your lite coloring effort, I hope, on KrazyDad 425. The initial lite trees deliver a cluster merge, and as these grow, lite coloring gives two confirmations and a coloring wrap to finish without trial. The first … Continue reading →

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A Lite Update on Castillo’s Only Extreme 347

Posted on January 26, 2021 by Sudent

This post updates a solution by coloring trial in the review post of 12/19/17. A bypass of 6 4-fills resolves 3 of them immediately,  but goes no further than the original 3-fill only bypass.  Then we follow Beeby through a … Continue reading →

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Beeby Softens Up ultrahardcore 443

Posted on December 15, 2020 by Sudent

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

Posted on December 1, 2020 by Sudent

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

Posted on November 17, 2020 by Sudent

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

Posted on October 13, 2020 by Sudent

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 as a simple chain, but it’s AIC … Continue reading →

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Two Clues and Pattern Coloring Beat 179

Posted on September 29, 2020 by Sudent

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

Posted on September 22, 2020 by Sudent

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

Posted on September 1, 2020 by Sudent

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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