Tag Archives: Only Extreme Sudoku

Only Extreme 390 is Advanced


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


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


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


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


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


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


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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