Tag Archives: finned swordfish

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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Ultrahardcore 47 Pattern Trial


This post bypasses Sudokuwiki’s  forcing chain parade with a value pattern trial, strengthened by the Single Alternate Sue de Coq analysis of the last post.  One pattern is tried and fails, leaving a coloring cluster. When the trial of the … Continue reading

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Mixed Solutions on Nakamoto Extreme 63


This post reports Sudokuwiki AIC building in Nakex 63, until it is overtaken by pattern analysis and coloring. The solver’s path is continued in the following post. Nakex 63 basic is tough, despite a productive bypass.     The first … Continue reading

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Reviewing James Forest’s Classic Sudoku


This post presents a Sysudoku solution of the Classic 24, from James Forest’s Book 30. We’ll do every 24th Classic. The first suggests an easy basic and an interesting diversity of advanced methods. The bypass fills the East boxes with … Continue reading

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Fleshing Out Stuart’s ALS Node Figure 30.1


Andrew Stuart’s The Logic of Sudoku, in a chapter on Almost Locked Sets, presents an example of an ALS node in a confirming Almost Nice Loop, as Figure 30.1. This post fills in the solution, before and after the series … Continue reading

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LPO Knocks Out World’s Hardest 36


A challenge posed by The Worlds Hardest Sudoku Book 36: Is there a route to the solution less advanced than pattern analysis? The puzzle is otherwise distinguished by a BARN right out of line marking, and a notable lack of … Continue reading

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The Volume 10 Rebecca Bean Extremely Hard Sudoku


This post begins the second review of a Rebecca Bean collection, this one prompted by a clever cover, and similarities in format to recently reviewed collections attributed to Moito Publishing, A.D. Ardson and James D. Glover. Here we resolve Extremely … Continue reading

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Ardson’s Toughest, Even Slightly Diabolical, 310


This post fleshes out the review table entry, and checkpoints the two week homework assignment of the Ardson Sudoku Diabolical v.1. The early coloring typical of the review is helpful, but not decisive. In the bypass, the 3-fill menace is … Continue reading

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Moito’s I-4 Inspires a Trace Refinement


This post introduces an improved trace convention for 3-fills, in response to a complex of 3-fills in the bypass solution of Very Hard I-4 from Moito’s Sudoku Road to Mastery, the puzzle Moito rates as highest possible difficulty. The bypass … Continue reading

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A Chicken Chok’in Checkpoint on Unhidden Chains


This post checkpoints Royle 17-16774, a rare example in The Hidden Logic of Sudoku of conjugacy chains dealing with a monster cloud of candidates. The checkpoint also catches SudoRules dismembering a “useless” XY nice loop that somehow sneaked into THLS. … Continue reading

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