Monthly Archives: February 2012

Group Therapy

Posted on February 28, 2012 by Sudent

Grouping is a way to uncover more slinks and create more X-chains and X-loops.  The X-candidates in a chute are grouped together.  The group is “true” if it contains a true candidate, and “false” if it does not. Groups can … Continue reading →

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Andrew Stuart’s Guardians

Posted on February 21, 2012 by Sudent

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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Slink Loops

Posted on February 14, 2012 by Sudent

A “slinks only” X-loop of an even number of slinks consists of alternating true and false candidates.  That we know by the logic of slinks.  We just don’t know if it’s the arbitrary one we pick, or the next one, … Continue reading →

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Alternating X-Loops

Posted on February 7, 2012 by Sudent

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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