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Tag Archives: irregular XYZ-wing
Funster Extreme 46 Not So Much
The review of Charles Timmerman’s funster Hard to Extreme Sudoku continues with Extreme 46. It’s entertainingly advanced. Extreme 46 has its moments. The basic trace is spread across the page with 3-fill after 3-fill. Two unusual events occur in box … Continue reading
Coloring Dominates Very Hard III-15
The review of Moito’s Road to Mastery Sudoku continues with another example of early coloring and its cooperative interactions with the X-panel. The advanced path is similar to that of Very Hard I-35 two posts back, but this time coloring … Continue reading
How Not to Find a Multiple on Moito’s Road
After a jaw dropping irregular XYZ-wing, a marking mistake reveals an unavoidable UR and two solutions of Very Hard IV-6, then the correction leads to an even more remarkable, but no less unavoidable uniqueness violation. Coloring reveals the logical path … Continue reading
Only Extreme 218 Straight Up
Barely escaping the bypass, Manuel Castillo’s Only Extreme 218 gets tough, and brings out some seldom used methods. An alternative trial path by Single Alternative Sue de Coq, normally held in reserve, follows in a second post. The bypass filled … Continue reading
The Akron 2017 Championship Sudoku
This is another Sysudoku analysis of the championship puzzle of the Sudoku tournament put on by the Akron-Summit Public Library. It’s an annual tournament of four rounds, the last being a three person solve – off on poster board grids, … Continue reading
Cluster Extension by Not-Both Trials
In this post and the next, the first puzzle of the Manuel Castillo Only Extreme Sudoku review, Only Extreme 3, is taken ahead of the review of his Only Hard Sudoku. The reason is in the title. Rounding out the … Continue reading
The Limited XYZ-wings of THLS
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
