Monthly Archives: November 2013

Higher Rank Theory


This post extends the proof of the rank theorem to the rank = r >0 case, and finds a sysudoku interpretation of a rank 3 removal from the General Logic page of http://www.SudokuOne.com .  The method is Andrew Stuart’s cell … Continue reading

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Pulling Rank


This post turns attention to Sudoku  techniques based on the concept of rank.  I’ve seen references to this concept in many places, but nowhere else as clearly described as on the website http://www.SudokuOne.com, under the title of general logic. I … Continue reading

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The 2013 Akron Sudoku Tournament


Here’s my report on the second successful Sudoku tournament put on by the Akron-Summit County Library.  Yours truly didn’t complete a single puzzle in the contest, but I renewed acquaintance with some phenomenal solvers.   I’m including a trace and checkpoint … Continue reading

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A Tough Nugget Removal


This post illustrates how advanced techniques are employed in a series  of Sue de Coq verification trials on a super extreme puzzle.  The series was begun on the Golden Nugget in the previous post,  with a partial pattern of five … Continue reading

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