Category Archives: Barker

As SudokuOne

Rank’s Little Gotcha

Posted on December 3, 2013 by Sudent

Here we encounter the taxing complication in rank theory which occurs when base sets are allowed to intersect.  This further limits rank theory as a basis for human solving methods.  This blog opts out of rank field theory. As I … Continue reading →

Posted in Advanced Solving, Barker, Expert Reviews, Extreme Solving | Tagged , , , , | 2 Comments

Higher Rank Theory

Posted on November 26, 2013 by Sudent

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

Posted on November 19, 2013 by Sudent

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 →

Posted in Barker, Expert Reviews, Extreme Solving | Tagged , , , | 5 Comments