What I did this Summer


The previous post of June 7 let you out for three months. No homework.  Welcome  back to school . This is your notice that Tuesday posts resume on September 6.

Over the summer  I  got in a trip to Sidney and Port Douglas, Australia and to the highlands of Malaysia, and ran a muggy half marathon in Akron, Ohio, my home town.  That’s fine, but what you really want to know is, what about Sysudoku?

Well, for one thing, I started my long intended review of Denis Berthier’s The Hidden Logic of Sudoku .  I have the first part in the can, for release this fall. The issue of this part is whether or not Denis’ account of the hidden properties of Sudoku logic, as exploited in his rule based AI solver, has practical value for the enterprise of human solving.  Later, after allowing readers a breather, I want to look at specific strategies that Denis has advocated, starting in THLS.

Later still, when there’s time, I do want to come back to my Exocet skirmish with David P. Bird, who believes he is not conducting a trial when he certainly appears to be.  David began a thread on Sysudoku, but dismisses the blog as “homespun” and devoid of any value for forum devotees.  He’s probably right, but that’s not about Sysudoku.

Getting to my main excuse for taking the summer off, it was to think about how to revise and update the Sysudoku posts, going back five years.  The first year, of late 2011 and 2012, is the most in need of updating and the most important.  Unless I start over, the pages and these posts are the resources for new readers to learn about the systematic basic and advanced strategies I enjoy and recommend.

I didn’t do much revision this summer, but now I do have a plan. It’s not to start over.  Instead, I’ll revise and link the posts and pages to preserve the chronological emergence of ideas by post date, but superimpose a path through the material in the recommended solving order flowcharted for reference on the Order of Battle page above.   Learners start with the beginning posts, and expert browsers go top down through the Find It pages.

My immediate revision projects are to integrate the slink marking bypass into the basic solving posts, and to replace all 1-D traces and all grids with multiple candidates of the same number.  I’m revising the Traces page this week.

My first normal post will be a review of Mike Peterson’s   Very Hard Sudoku, v.1 .  This review is very much related to the bypass.

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About Sudent

My real name is John Welch. I'm a happily married, retired professor (computer engineering), timeshare traveling, marathon running father of 3 wonderful daughters and granddad to 7 fabulous grandchildren. The blog is about Sudoku solving. It covers how to start, basic solving to find candidates efficiently, and advanced solving methods in an efficient order of battle. It is about human solving methods, not computer solving.
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