Monthly Archives: October 2012

Unsolvable 40 Logically Solved

Posted on October 30, 2012 by Sudent

In this post we checkpoint the solution of Stuart’s Unsolvable 40, via LPO and a coloring cluster extended by pattern slinks.  The solution of this puzzle by pattern analysis expresses well the ideals of Systematic Sudoku, and demonstrates what can … Continue reading →

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The Pattern Slink

Posted on October 23, 2012 by Sudent

Here I introduce a new form of strong link, the pattern slink.  The letter assignment panel for pattern enumeration in LPO identifies such slinks.  Every unit induced slink between a number’s patterns identifies two mutually exclusive sets of patterns.  This … Continue reading →

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Scrounging for New Pattern Sets in LPO

Posted on October 16, 2012 by Sudent

Here we attempt a more satisfying victory over the Stuart Unsolvable #40, by using the pattern reductions of the first pattern sets to add new pattern sets, moving closer to the full Pattern Overlay Method.  This series of posts on … Continue reading →

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Searching for Orphans in LPO

Posted on October 9, 2012 by Sudent

This post illustrates the search for orphans in my Limited Pattern Overlay method.  Orphans are what we going to call candidates not belonging to any completed pattern.  Orphans are found by means of the freeform diagrams, as illustrated in Pattern … Continue reading →

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The First Year

Posted on October 2, 2012 by Sudent

My first post on sysudoku.com was September 29, 2011. It previewed a blog to develop material for Systematic Sudoku, a book described as a workbook for human engineered Sudoku solving.  Although there is a bit more of the workbook material … Continue reading →

Posted in Advanced Solving, Basic Solving Procedures, Sudoku Toolware | Tagged , , , | 2 Comments