Tag Archives: ER

Hodoku X-chains on the X-panel


On this post, X-panel chain analysis is illustrated on a Hodoku example. Hobiger’s coverage of X-chains is shallow on fundamentals and distracted with named X-chains. Several X-chain highlights of the blog are recalled. Hodoku starts the chain types with X-chains. … Continue reading

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Hanson’s Polarity ANL


This post reviews the section of Bob Hanson’s Sudoku Assistant report titled Almost- Locked Ranges. It presents an effective solving idea, but with hazy definitions and a confusing name. Here I identify this idea as a familiar one in the … Continue reading

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Forcing Chains in Sue de Coq Analysis


In this post, the classical forcing chain and a sysudokie endorsed application are demonstrated on a multiple solution puzzle. An underlying assumption made in solving a Sudoku puzzle is that it has one and only one solution.  Some composers offer … Continue reading

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The Shameless Sashimi


Which Sashimi did you find in the LA Times 5/14/09 5-panel?  Was this one of them?  We could describe it as a Sashimi 5-wing in r13 with fin r3c1.  Note the new 5-chain added to the panel.  It also removes … Continue reading

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Krakening a Finned Fish


Virginia, your mother tells me how your playground friends told you frightening tales about Harry Potter’s kraken monster  when you mentioned the kraken fish you saw at the aquarium.  You needn’t worry, dear.  There’s no such thing as a kraken … Continue reading

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Kraken Fish and Sashimi Fish


As we round the corner in our aquarium tour, the label on the n The aquarium tour continues with two additional fish, and how ER/forcing chain “seeing” applies to them. As we round the corner in our aquarium tour, the … Continue reading

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XY-Chains


This post explains the XY-chain, the most specific, easy to spot, and prolific of Alternating Inference Chains. It includes what many call the XY wing, as the shortest possible XY-chain. One XY-chain can generate multiple toxic candidate pairs. An XY-chain … Continue reading

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