Category Archives: Sudoku Toolware

What we’ve got and how to use it.

A Guide Update and a Funster Kick Off


The threat of a “The World’s Hardest Sudoku” now relieved, this post starts a review of the “extreme” section of Charles Timmermans Funster Hard to Extreme Sudoku. But mostly, it’s a progress report on the Guide, a set of pages … Continue reading

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Suset Jelly in nrc Space


Here we work through an advanced supersymmetry example from The Hidden Logic of Sudoku, without the symmetries.  The humanly practical tools of Sysudoku are entirely adequate to the task. The theme of this review is that the burdensome emulation SudoRules, … Continue reading

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Sysudoku for Unsolvabrights


In this post, two distinctly Sysudoku techniques have roles in a pattern trial of an Andrew Stuart Unsolvable, this time #183 of January 16, 2016. First, pattern (template) analysis on two numbers finds compatible partial patterns for a coloring trial. … Continue reading

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A Tracing Exercise with Wex 434


A careful marking session finishes Wex 434 in box marking! This surprising event demonstrates how 2-D depth first tracing fully exploits removals and confirmations. My first time through to a solution I considered Wex 434 among the most deserving of … Continue reading

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A Little More Extreme


Here is a follow up on the advanced level More Extreme 4, with background looks at the bv map, XYZ map, and X-panel . There is a challenge to find a forcing chain XYZ alongside a regular one. Entering the … Continue reading

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Gordon Guide Puzzle Review


This post reviews the collection of 700 Frank Longo puzzles following the text in the Gordon Guide to Solving Sudoku. A review table summarizes the Sysudoku rating of 10 preselected puzzles, and one advanced puzzle is analyzed in detail. The … Continue reading

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Cycling Blindfolded with the Guide


This post calls out Gordon Guide misguidance related to coloring, slink chains and the XY chain. AIC fundamentals are omitted in favor of ineffectual strategy and renaming of well known AIC formations. First, lets checkpoint the basic solving of the … Continue reading

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A Bv Scan of Week 48


Here we checkpoint the sysudoku bv scan on the blog homework puzzle, Week 48 in Paul Stephens’ Mastering Sudoku Week By Week.  The scan includes Sue de Coq and APE, two techniques ignored by Stephens’ books, and two techniques, XYZ-wings … Continue reading

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The First Year


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

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Advancing to LPO on Unsolvable 40


This post confirms the intractability of Andrew Stuart “Unsolvable #40” to SSOB  bv scan, X-panel analysis, coloring.  In preparation for Limited Pattern Overlay, a shortcut AIC reduces the number of patterns  for the number 8, and a coloring cluster is … Continue reading

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