Tag Archives: XYZ-wing

Sudokuwiki’s Nakamoto Extreme 103

Posted on March 17, 2020 by

After Sysudoku Basic, this post describes the Sudokuwiki advanced and AIC solution path on Nakex 103. The next post reports an alternative path shortened significantly by a freeform pattern analysis. Nakex 103 starts a little differently, with some bypass success: … Continue reading →

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A Timely Finned Fish in funster Extreme 88

Posted on August 21, 2018 by

Continuing the review of Charles Timmerman’s funster Hard to Extreme Sudoku, with Extreme 88. The basic compensates for a modest  bypass with a favorable line marking. A naked single early and a finned 2-wing late. Finned fish is a topic … Continue reading →

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Only Extreme 132 Is Cut From the Extreme Team

Posted on October 24, 2017 by

Another example of expansion of a limited coloring network via the not-both test on an AIC slink. It’s an extreme tactic that need only be tried as a last resort. While the expansion does work in OnEx 132, it is … Continue reading →

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Only Not Extreme 46

Posted on October 10, 2017 by

The review of Castillo’s Only Extreme collection continues with Only Extreme 46.  A very extensive bypass is survived, to leave very little to add in box marking, and an interesting line marking.  The rest is murder by the usual suspects … Continue reading →

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The Limited XYZ-wings of THLS

Posted on December 20, 2016 by

The XYZ-wing is limited in The Hidden Logic of Sudoku, as it generally is in Sudoku literature, by  a limited conception of the weak link.  This post presents a resolution of Royle 17-12407 using an iXYZ-wing, a form of the … Continue reading →

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CLEF Homework on Unsolvable 190

Posted on May 3, 2016 by

Here is a checkpoint Sysudoku reader’s homework on the Sysudoku Cross Line Exocet Filter introduced in the previous post. Was it hard?  I stumbled many times on the 3467 case of the last week, and I may need corrections on … 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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