Tag Archives: Only Extreme Sudoku

A Lite Update on Castillo’s Only Extreme 347

Posted on January 26, 2021 by Sudent

This post updates a solution by coloring trial in the review post of 12/19/17. A bypass of 6 4-fills resolves 3 of them immediately,  but goes no further than the original 3-fill only bypass.  Then we follow Beeby through a … Continue reading →

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Only Extreme 390 is Advanced

Posted on May 28, 2019 by Sudent

This post finishes the updates on Manuel Castillo’s Only Extreme Sudoku with a less advanced OnEx 390.  This one is a better example of the Sysudoku XY Railway than was the original post. No trials were required in the ten … Continue reading →

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Sudokuwiki Solves Only Extreme 347 by AIC

Posted on May 21, 2019 by Sudent

In the original Only Extreme review, OnEx 347 was an example of a coloring trial on a limited cluster generated by pattern analysis. In this update, Andrew Stuart’s solver demonstrates a solving path to a final coloring without trials, via … Continue reading →

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Only Extreme 304 Scavenger Hunt

Posted on May 14, 2019 by Sudent

This post finishes the updated review of Only Extreme 304, displaying the Sudoku moves listed last week for the scavenger hunt. The ALS X-chain boomerang starts with the 9-chain emerging from r9c7 and terminating on the 9 candidate of ALS … Continue reading →

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Only Extreme 304 is AIC Level

Posted on May 7, 2019 by Sudent

This post and the next update Castillo’s Only Extreme Sudoku review with a solution of OnEx 304 without trials. Most of the solution path is in AIC building, the most challenging level of Sysudoku Advanced. The only move prior to … Continue reading →

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Classic Review Ends,OnEx 261 Escapes Trials

Posted on April 30, 2019 by Sudent

This post traces the bypass finish of Classic 240 and presents the review table for James Forest’s Classic Sudoku. Then it continues the update review of Manuel Castillo’s Only Extreme Sudoku with Only Extreme 261. Demonstrating a solution without trial, … Continue reading →

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Only Extreme 390 – a Fitting Finale

Posted on December 26, 2017 by Sudent

In this post, the last preselected Sudoku of the review, Only Extreme 390, is solved by only advanced methods, but by an extremely thin margin.  The first crack in the armor is an irregular XYZ-wing. At first I missed an … Continue reading →

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A Coloring Trial for Only Extreme 347

Posted on December 19, 2017 by Sudent

Here a Manuel Castillo Sudoku sends me directly to last resort city.  Although the bv field eludes productive XY-chains or AIC, coloring is decisive enough to solve 347 in a single trial. Your first view of the grid comes with … Continue reading →

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Dragging in Only Extreme 304

Posted on December 12, 2017 by Sudent

This post continues with three more trials, two to reach a solution, and one to guard against multiple solutions, in Castillo’s Only Extreme 304. This is getting reeeaallly extreme. Last week, we managed to extend and XY-chain across the grid … Continue reading →

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Definitely Extreme 304

Posted on December 5, 2017 by Sudent

This post encounters what seems to be a monster in Castillo’s Only Extreme 304. A stingy basic leaves a near monster cloud of candidates resistant to the ordinary advanced repertoire. Following a theme of this review, a small coloring cluster … Continue reading →

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