Tag Archives: hidden triple

Brian Challenger’s Super Fiendish 7


The review of Challenger’s Super Fiendish collection opens with a long post, revisiting some advanced methods not seen here recently. Somewhat fiendish is the stonewalling in basic. The bypass gets nowhere, and the hidden triple alone removes candidates. Here is … Continue reading

Posted in Advanced Solving | Tagged , , , , , | Leave a comment

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

Posted in Basic Solving Procedures, Shortz | Tagged , , , , , | Leave a comment

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

Posted in Basic Solving Procedures, Berthier, Expert Reviews | Tagged , , , , , | Leave a comment

Subsets by Susets


This post explains the concept of locked sets, and the terms associated with them.  It suggests how to find them, and includes  a scratchpad version of a common computer algorithm for detecting them. A locked set is defined with reference … Continue reading

Posted in Basic Solving Procedures, Sudoku Toolware | Tagged , , , , , , | Leave a comment

Line Marking Follow Up Actions


This post describes the follow up to the candidate fill of each line in Sysudoku line marking.  This includes the marking of line slinks, checking for X-wings, identification of  naked and hidden singles, and marking of bi-value cells. It also … Continue reading

Posted in Basic Solving Procedures | Tagged , , , , , , , | Leave a comment