Systematic Sudoku, or Sysudoku for short, is a blog about humanly practical techniques for solving Sudoku puzzles. The blog consists of weekly posts and a set of supporting pages, accessed by a menu bar.
Blog posts are released Tuesdays at 2 p.m. EST. Most current posts detail the solutions of difficult puzzles as a way of rating and reviewing published collections. A good way to get an overview is to look over the Titles page, and other support pages. To get to a particular post, use the monthly archive list right margin list, and scroll to your date and title.
Besides Titles, there is a glossary called Sysudoku Speak, a Tools page describing ©PowerPoint and ©Word blog templates, and summaries of conventions used in review tables and traces. Also there are pages for access to blog material. Find It is a tree of pages linking to posts by solving phase and method.
Those few that are interested in early development of Sysudoku can work through the posts from the beginning in September 2011. For everyone else, I recommend the Guide, which is organized by solving order and supporting logical principles.
The Guide is under development, now covering Sysudoku Basic only, but that is sufficient for most newspaper and magazine puzzles. In 2018 the Guide will expand to cover the advanced techniques described in 2012, and anyone reaching the current end can easily pick up with the 2012 posts to continue where the Guide leaves off.
Puzzles that resist all advanced methods are labeled here as Extreme, and are subject to “trials”. In a trial, sets of placements are defined. All have to be in the solution (true) or none (false). In the trial, the set is assumed true, and the puzzle is solved from there, or solving reaches a violation of Sudoku definition rules. In either case, an investment in trial sets results in considerable progress, often decisive, on the puzzle. The Guide will make references and have links to trials, but will include them only after advanced methods are addressed.
In the blog, trials have proven to be the human means of solving monsters, and enumerating multiple solutions. And with trials as the proper outlet, Sysudoku places no value on trial-and-error guessing of individual placements, or in the discovery of trap doors, the single unjustified clue that solves the puzzle.
Comments are welcome and complements are appreciated, but I’ll apologize in advance: Sorry, but only those of interest to Sysudoku readers can be published or answered. In the blog I write as Sudent. My actual name is John Welch, from Fairlawn, Ohio, a close neighbor of Akron.