Tag Archives: finned X-wing

Coloring Dominates Very Hard III-15

Posted on January 23, 2018 by

The review of Moito’s Road to Mastery Sudoku continues with another example of early coloring and its cooperative interactions with the X-panel. The advanced path is similar to that of Very Hard I-35 two posts back, but this time coloring … Continue reading →

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Cluster Extension by Not-Both Trials

Posted on August 29, 2017 by

In this post and the next, the first puzzle of the Manuel Castillo Only Extreme Sudoku review, Only Extreme 3,  is taken ahead of the review of his Only Hard Sudoku. The reason is in the title. Rounding out the … Continue reading →

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Longo’s Nastiest Ever After

Posted on February 9, 2016 by

This post finishes the illustrative review of Frank Longo’s The Nastiest Sudoku Book Ever, with review puzzles 673, 684, 695 and 706. The bv scan and occasional easy coloring continue to be enough for what Frank claimed to be the … Continue reading →

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The Olive Side of Fata Morgana

Posted on July 14, 2015 by

This post illustrates with Fata Morgana the practice of taking both sides of a trial, to be sure that a contradiction is found. The pink trial led to the solution. Fully expecting a contradiction, the olive trial begins with the … Continue reading →

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Finishing More Extreme 200

Posted on March 24, 2015 by

This post continues, slicing the 9 patterns of More Extreme 200, and conducting trials of the divided sets. A brief, but decisive cluster merge ends the struggle. Antoine was right. #200 is outstanding. Following a pink/olive analysis on the 9 … Continue reading →

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Gordon Guide Puzzle Review

Posted on January 27, 2015 by

This post reviews the collection of 700 Frank Longo puzzles following the text in the Gordon Guide to Solving Sudoku. A review table summarizes the Sysudoku rating of 10 preselected puzzles, and one advanced puzzle is analyzed in detail. The … Continue reading →

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Grinding Down Insane 495 with LPO Coloring

Posted on October 15, 2013 by

In this concluding post on Insane 495, one of two clusters is expanded by several means, including color LPO and a nice loop, merging clusters and reaching a point where an easy trial color wraps it up.  Insane 495 is  … Continue reading →

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