Tag Archives: hidden subsets

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

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

X-treme Hidden and Naked Treasures


This post features hidden and naked subsets in two Sudoku X-treme review puzzles. All occur in line markings. The first continues from the previous post. The X-treme 210 line marking features two naked triples. The first one breaks up a … Continue reading

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

Sudoku Assistant Finds Locked Sets


This posts discloses several significant omissions in Hanson’s discussion of locked sets, including his examples, in the report, Sudoku Assistant – Solving Techniques. A subtle and sometimes bungled task in basic solving is the discovery of locked sets or subsets. … Continue reading

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

Suset Enumeration on Sue de Coq


This post demonstrates a systematic  enumeration of subsets in the line marking of the Sue de Coq debut puzzle.  More difficult units are resolved by the scratchpad suset algorithm introduced in the previous post of October 25, 2011. To checkpoint … Continue reading

Posted in Basic Solving Procedures, Sudoku Toolware | Tagged , , , , , | 5 Comments

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