Tag Archives: color wrap

Ultrahardcore 47 Pattern Trial

Posted on July 28, 2020 by

This post bypasses Sudokuwiki’s  forcing chain parade with a value pattern trial, strengthened by the Single Alternate Sue de Coq analysis of the last post.  One pattern is tried and fails, leaving a coloring cluster. When the trial of the … Continue reading →

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A Coloring Tidal Wave Drowns Sufi 37

Posted on December 17, 2019 by

Here, Brian Challenger’s Super Fiendish 37 makes it to advanced, but with the bi-value field   inviting multi-cluster coloring, a systematically easy solving technique. There are some X-panel fruits to harvest first in the order of battle, before coloring closes the … Continue reading →

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Lucky Panda 240 Rides Nice Loop Coloring

Posted on June 25, 2019 by

The candidates of a nice loop form a coloring cluster. This review puzzle from the Lucky Panda Sudoku review illustrates a decisive nice loop coloring. Two hidden UR 2 show up as well. After a productive bypass and box marking, … Continue reading →

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Funster Extreme 46 Not So Much

Posted on August 7, 2018 by

The review of Charles Timmerman’s funster Hard to Extreme Sudoku continues with Extreme 46. It’s  entertainingly advanced. Extreme 46 has its moments.  The basic trace is spread across the page with 3-fill after 3-fill. Two unusual events occur in box … Continue reading →

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The World’s Most Over-Titled Sudoku Book

Posted on May 1, 2018 by

This post starts the review of World’s Hardest Sudoku Book, tracing Very Hard 25, the only one rated a 1.00. The review will cover the highest rated 10, taking the rating down to 0.90. The lowest of the 200 is … Continue reading →

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A.D. Ardson’s Sudoku Diabolical

Posted on February 6, 2018 by

This post begins a brief review of A.D. Ardson’s Sudoku Diabolical, with a review table and analysis of the first of a pre-selected series 30, 70, . . . , 390. Ardson’s Sudoku Very Hard Puzzles, volume 2, very similar … Continue reading →

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A Very Hard Finale with Ardv2 398

Posted on June 27, 2017 by

A hard basic leaves it to an unusual ALS to shake things loose, enabling an XY and a UR to wrap it up.  Maybe the hardest of the pre-selected Very Hard.   Line marking looks easy, until you look at … Continue reading →

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More Satisfaction in Saturday 2

Posted on April 4, 2017 by

This post completes the last hour of the Satisfaction Sudoku tour of Sysudoku, with alternative solution paths beyond the bv scan in Saturday 2. It features a finned X-wing, a coloring wrap, and an alternative freeform pattern analysis with a … Continue reading →

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An xyt Color Wrap

Posted on February 14, 2017 by

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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Berthier’s xyt-chains in THLS

Posted on February 7, 2017 by

Next we review the introduction of xyt-chains in The Hidden Logic of Sudoku. These are modified XY-chains which allow extra candidates in the chain cells, and unlike regular XY-chains, make eliminations regardless of whether the chain starting candidate is true … Continue reading →

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