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Tag Archives: XY-wing
Funster Extreme 60 and 74 Go Together
Two brief advanced appearances are reported in this post in review of the Extreme section of Charles Timmerman’s Funster Hard to Extreme Sudoku. In Extreme 60, the bypass starts with a 3-fill and uses them to solve a big wedge. … Continue reading
Decoding Hodoku Chain Notes
This post comments on the first part of the Hodoku “Chains and Loops” page. It reveals the premise dependent view of chains to be based on computer coding, and unsuited for human solving advice. It explains Hodoku’s chain notations as … Continue reading
Posted in Expert Reviews, Hobiger
Tagged AIC, Bernhard Hobiger, forcing chains, Hodoku, irregualr XYZ-wing, XY-wing
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Hodoku’s Limited XYZ Wings
In this post reviewing the Hodoku Wings page linked under Techniques, we see how an expert programmer can go wrong in explaining how to recognize where a technique applies and why it works . The omission of irregular wings is … Continue reading
Posted in Advanced Solving, Expert Reviews, Hobiger
Tagged ALS Sue de Coq, Hodoku, irregualr XYZ-wing, W-wing, XY-wing, XYZ-wing
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Wings and Chains With the Gordon Guide
This post reviews the Chapter 9 of Peter Gordon’s Sudoku Guide, entitled Forcing Chains and Grid Coloring. The guidance is very limited, and what there is, promotes guessing as opposed to solving by logic. This verdict is confirmed in the … Continue reading
Posted in Advanced Solving, Expert Reviews, Gordon
Tagged Gordon Guide Sudoku, Peter Gordon, regular XYZ-wing, Sudoku turbot fish, XY-chain, XY-wing
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Bent Naked What?
Here I object to Bob Hanson’s use of the XY-wing and the XYZ-wing, in Sudoku Assistant – Solving Techniques, to introduce his more complicated concept of “bent naked subsets”. This treatment limits the wings to unit based links. Also I’m … Continue reading
Posted in Advanced Solving, Expert Reviews, Hanson
Tagged bent naked subsets, Bob Hanson, XY-chain, XY-wing, XYZ-wing
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