Tag Archives: grouped ANL

An AIC Parade by ultrahardcore 397


This post follows basic with a variety of Alternate Inference Chains. It is an opportunity to compare their effects and corresponding Sysudoku labeling. Three bypass clues, naked triple eliminations, and the line slinks marked in cell corners, that’s the  outcome … Continue reading

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A BARN Storming UHC 353 Finish


This posts finishes left page ultrahardcore 353, using several notable moves to expand a cluster.  Sudokuwiki starts it with a grouped terminal ANL with line and box winks, a regular swordfish expands the cluster, trapping four candidates. Expansion creates an … Continue reading

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UHC 309 Rounds the Bases


The ultrahardcore review solvers illustrate a diverse solution path, before and after AIC and cluster building. Here is the grid after the bypass and box marking. Beeby found a naked single SE4 in r8c7 in its basic. The Sysudoku Basic … Continue reading

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Ultrahardcore 91 Trials Unleash Beeby


Here is the basics launch on Stefan Heine’s ultrahardcore 91, which quickly runs my two assisting solvers out of humanly practical removals. A Single Alternate Sue de Coq  trial reduces two clusters two one, and produces  two critical clues. In … Continue reading

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Wrapping Up Nakamoto Extreme With 183


This post completes the review of the Nakamoto Extreme collection. The review table follows the finish of Nakex 183. A Sudokuwiki assisted solution of Nakex 183 continues with the second APE triggered by the first’s removal of 8r2c9. In this one, … Continue reading

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Reviewing a Truly Extreme Collection


This post and the next initiate a review of Sudoku Puzzle Book, Extreme Level by J. B. Nakamoto, with Nakex 3. The review combines moves by Andrew Stuart’s Sudokuwiki solver with Sysudoku alternatives, while reporting and interpreting moves in accordance … Continue reading

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Andrew’s Solver Tames Worlds 200


This post walks through the “very  hard” part of the solution path taken by  Andrew Stuart’s Solver through puzzle 200 of The World’s Hardest Sudoku Book by authors unknown. This is a remarkable turn of events for a blog devoted … Continue reading

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Bean Gets No Second Extreme


This updated post describes how I-41, in Extremely Hard v. 10 by Rebecca Bean, after one bent region concession to two Gordon Fick ALS_XZ and a BARN, demands extensive AIC building, but  rewards the updating bv map and X-panels on … Continue reading

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Berthier’s xyt-Chains Rated Extreme


This post suggests a limited role for Denis Berthier’s xyt chain in human solving. I found no THLS examples of longer chains not requiring prior xyzt or hidden chains.The last prospect, Royle 17-33442 proves to be both unjustified and unnecessary. … Continue reading

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