Tag Archives: Stefan Heine

UHC 177 Stretches It Out

Posted on October 19, 2021 by Sudent

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. Continuing from the green wrap of last week, blue SW3 takes the last r9 5 outside … Continue reading →

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Wrapping Up UHC 89

Posted on September 21, 2021 by Sudent

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 UHC 45 Discontinuous Nice Loop Seminar

Posted on August 31, 2021 by Sudent

Heine’s left page ultrahardcore 45 offers a host of examples illustrating when a Beeby “discontinuous nice loop” is and isn’t a 1-way. Coloring closes the class. UHC 45 has a remarkable number of bv and line slinks, given the monster-like … Continue reading →

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Pattern Analysis with Coloring on UHC 1

Posted on August 24, 2021 by Sudent

Coloring can be combined with freeform pattern analysis to determine a small set of pattern trials for Heine’s ultrahardcore 1. Typical choices for this decision are reviewed. A single trial produces the solution. For this we go back to the … Continue reading →

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Dov Introduces Lite Coloring of ultrahardcore 311

Posted on February 9, 2021 by Sudent

This post finishes the lite coloring revisit of past trials with Dov Mittelman’s lite introduction. It leads to a solution of Stefan Heine’s UHC 311 without trial. This puzzle occupied 3 posts in the ultrahardcore review, starting with November 3. … 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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An Error Hides a Lite Coloring Trap on ultrahardcore 399

Posted on January 12, 2021 by Sudent

This post corrects an error on the post of December 8, that prevents a lite coloring trap in ultrahardcore 399. Then there’s follow up on the trap, with the lite coloring marking in place. Trial is not avoided, but the … Continue reading →

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Pattern Trials Peel the UHC 487 Onion

Posted on December 29, 2020 by Sudent

The ultrahardcore review ends, with Stefan Heine’s 487 giving up a naked single and two skyscrapers, and a jaw dropping complex 1-way, shuts down the solver team. Slicing at it with three onion peeling pattern trials leaves very little for … Continue reading →

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SASdC Unlock UHC 443 for Beeby

Posted on December 22, 2020 by Sudent

After the hidden unique rectangle hinted last week, a pair of Single Alternate Sue de Coq trials gets the review solver Beeby moving again. ALS-wings and a finned X-wing get us to a colorful finish. The hidden unique rectangle left … 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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