Tag Archives: X-loop

Unraveling the Mutant Fish


This revised post explains what mutant fish are, and the rule used to eliminate candidates. It offers a hard-to- find proof that this rule works, and some spotting tips. Regular fish, finned fish, and sashimi fish are candidate elimination methods … 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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