Category Archives: Basic Solving Procedures

Starting with slink marking to find all remaining candidates.

Ardson Not So Hard Ardv2 118


Ardson Very Hard v.2 118 shows off the basic steps, but can’t quite dodge the consequences. A good Sudoku basic workout, and reminding us of the joys of basic solving. Here is the basic trace, completing box marking with a … Continue reading

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Touring the Bypass and a Human Engineered Inscription


This post continues the visit of Sudoku Satisfaction readers to Sysudoku with a demonstration of the slink marking bypass, line marking inscription, and basic subset spotting. How was lunch?  . . .  Good. OK, we’re ready to continue. Here is … Continue reading

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The Sudoku Satisfaction Tour


In the next three posts, I introduce Sudoku Satisfaction  by Richard Nicholas Seemel, by inviting sysudokies to attend a tour for Satisfaction readers. The tour will highlight differences between  two systems that agree on basic solving approach, but not on … Continue reading

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Hidden Logic Box/Line Interactions


This post looks at the brief and very late THLS treatment of box/line interactions in rc space. I say late, because box/lines (1/31/12) are essential in basic marking of candidates. But in The Hidden Logic of Sudoku,  box/lines are introduced … Continue reading

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Hidden Candidates of Hidden Logic


This post calls out the useless reporting scheme in place throughout The Hidden Logic of Sudoku, with a checkpointed hidden triple example that sysudokies have solved as homework. The Akron Tournament final checkpoint is at the end of this report. … Continue reading

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Hidden Logic Symmetries of THLS


This post explains SudoRules’ complementary grid transformations that, as The Hidden Logic of Sudoku demonstrates in many Royle 17 examples,  converts hidden line subsets into naked line subsets, and box subsets into line subsets. Of possibly more interest to sysudokies, … Continue reading

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Naked Singles in SudoRules


This post reveals how naked singles are produced, in Berthier’s rule hierarchy of increasing logical complexity,  by single rule that is a member of the set of rules for every resolution method. This explains why number scanning candidates, and maintaining … Continue reading

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