Category Archives: Expert Reviews

Reviews of definitions and solving advice published by Sudoku experts.

Beeby’s Elbow Quad in shye’s Catherine Wheel

Posted on February 15, 2022 by Sudent

This post carries us through the Sysudoku process, with the elbow fireworks of the Catherine Wheel, a second 4-set quad example from shye’s forum posts, cited in Beeby’s notes.   From the givens grill at the end of last week’s … Continue reading →

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The UHC Solvers on the Shye Fireworks

Posted on February 8, 2022 by Sudent

As announced last post, a series on Sysudoku Basic is postponed for another look at fireworks. In recent posts, we have been reviewing examples from forum commentator shye’s introduction of fireworks, and proposing a more limited, but  better defined form … Continue reading →

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The Elbow n-set of shye’s Roman Candle

Posted on February 1, 2022 by Sudent

This post is about the sixth example of forum commentator shye’s introductory post on fireworks, his name for elimination methods based on the restriction of candidate values in row/box/column combinations. Our series of posts on fireworks defines a particular form … Continue reading →

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Hanabi Without Fireworks

Posted on January 25, 2022 by Sudent

This post reports the ultrahardcore solver solutions for shye’s fifth fireworks example in the forum post  http://forum.enjoysudoku.com/fireworks-t39513.html . It shows the difficulty of the 5th example puzzle and the corresponding value of the fireworks solution. Starting with the common neck … Continue reading →

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Sharing Hanabi’s Secrets

Posted on January 18, 2022 by Sudent

This post details a fireworks analysis on “Hanabi”, shye’s fifth example. The first four examples used matching elbows alone, along with bi-value cells. This one uses forcing chains to identify the value winning placement in the neck cell shared by … Continue reading →

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Fireworks 4 Stretches the Matched Elbow Rule.

Posted on January 11, 2022 by Sudent

After a challenging basic, we get two matched pairs on two values again, but this time, linked by a single bv. The second challenge is the application of the matched elbow rule of the last post in a more hypothetical … Continue reading →

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Fireworks 3 Matches Elbows and Bv

Posted on January 4, 2022 by Sudent

This post develops a property of a 2 value elbow match, and uses it with matching bv. Before we start on that, here are the elbow panels for the last week’s second example, just in case you want to compare … Continue reading →

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X-panel Elbows for Fireworks

Posted on December 28, 2021 by Sudent

This post illustrates the use of the Sysudoku X-panel for fireworks analysis, as introduced  in forum corresponent shye’s first two examples. Here is shye’s statement of the fireworks principle: What does this actually mean? Given a row, column and intersecting … Continue reading →

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Ultrahardcore Review ALS-wings III

Posted on April 20, 2021 by Sudent

This post’s examples from UHC 179 include ALS-wings with bv cells, and uncover two essential facts about ALS value groups. This post’s examples include ALS-wings with bv cells, and uncover two essential facts about ALS value groups. Instead of following … Continue reading →

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Master Class 120 Completes the Update

Posted on October 1, 2019 by Sudent

This post concludes the review update of Tom Sheldon’s Master Class Sudoku and offers an amended review table. The bypass on Master Class 120 is strong enough to keep line marking fill strings short. There are two naked singles, one … Continue reading →

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