Tag Archives: naked quad

KDST 585 Favors the Bypass and Coloring

Posted on July 20, 2021 by Sudent

In spite of a big bypass, Krazydad Super-Tough v.5, b.8, #5 requires some work. An extensive XY railroad looks good, but a comparison with Medusa coloring favors the latter. This brings an opportunity to show unusual coloring resolutions, one involving … 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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A Pattern Trial Defeats ultrahardcore 135

Posted on September 8, 2020 by Sudent

This post reports on the value pattern trial of the last post, its results, and the relatively easy march to a two cluster coloring solution of Stefan Heines ultrahardcore 135. The trial starts with the three 7 clues and naked … Continue reading →

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Ultrahardcore 47 Single Alternate SdC Trials

Posted on July 21, 2020 by Sudent

This post does the basics on the second Stefan Heine ultrahardcore right page under review.  Then it shows eight ways to do the five advanced moves up to forcing chains, two of them duplicated by boomerangs. It closes by  identifying … Continue reading →

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PencilPress Extreme 57 and Two Master Classes

Posted on September 3, 2019 by Sudent

Three more Basic victories are reported here with interesting traces. Looking ahead, the blog is heading toward more advanced collections, with this series being the final statement on Sysudoku Basic. Ppbr 57 starts remarkably like ppbr49. C1 makes a wall … Continue reading →

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A Challenging Exercise in Sysudoku Basic

Posted on October 2, 2018 by Sudent

This post begins a review of Will Shortz’ Hard Sudoku, v.1.  The review details the solution of a pre-selected 10 puzzles from the “Beware! Very Challenging” section of that book. Nearly all Shortz puzzles reviewed in Sysudoku are solved in … Continue reading →

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Coloring Bails Out Basic on III-34

Posted on January 30, 2018 by Sudent

In this last post of Moito’s Sudoku Road to Mastery, Basic drives the 0.91 rated III-34  into a near BUG blind alley with a flurry of subsets and boxlines, then hands off to coloring for a quick score. A tight … Continue reading →

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Ardson Not So Hard Ardv2 118

Posted on May 2, 2017 by Sudent

Ardson Very Hard v.2 118 shows off the basic steps, but can’t quite dodge the consequences. A good Sudoku basic workout, and reminding us of the joys of basic solving. Here is the basic trace, completing box marking with a … Continue reading →

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An xyt Color Wrap

Posted on February 14, 2017 by Sudent

In the spirit of Valentine’s Day, I come across a coloring resource in Berthier’s xyt chain. The elaboration of Royle 17-20565 in Chapter XVII of The Hidden Logic of Sudoku is a challenge in itself. By the theory of looking … Continue reading →

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Just One More “More Extreme”

Posted on March 10, 2015 by Sudent

This post concludes the Alary More Extreme review puzzles with More 144, Basic marking features a timely naked quad, and advanced solving is another parade of highlights. The basic trace classifies More Extreme 144 as a tough one. I would … Continue reading →

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