Tag Archives: almost nice loop

Nishio Forcing Chains?


 Resuming the series on forcing chains, this post reveals that the Nishio forcing chain introduced on Andrew Stuart’s sudokuwiki site  is yet another re-interpretation of the AIC toxic set, a.k.a. the eliminating almost nice loop(ANL).  Here we also assert that … Continue reading

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A Colorful AIC Feast


We are met today to confirm the AIC take down by sysudokie readers on a tough steer,  Megastar Maestro 49 of Fall 2009. The rodeo begins with limited coloring, the identification of five AIC hinge cells, and an extension of … Continue reading

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Alternate Inference Chains (AIC)


Readers of this blog are familiar with an alternate inference chain in the form of an XY-chain on a bv map, or an xyt-chain on the grid, or as an X-chain or grouped X-chain on an X-panel.  Humans, as opposed … 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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Andrew Stuart’s Guardians


Andrew Stuart is the well regarded author of The Logic of Sudoku, and a Sudoku programmer whose solver and website are valuable aids to puzzle makers and solvers alike. In  http://www.scanraid.com , also linked as http://www.sudokuwiki.org ,  Andrew had a page … Continue reading

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Alternating X-Loops


X-loops of significance are alternating wink and slink, and pure slink loops over candidates of the same number, or such loops almost perfectly alternating.  They produce removals and clues.  Today we go around alternating X-Loops. First, solutions for diabolical 239.  … Continue reading

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