Category Archives: Sudoku Toolware

What we’ve got and how to use it.

Sysudoku Home Page

Posted on July 19, 2022 by Sudent

Systematic Sudoku (Sysudoku) is a human engineered way to solve Sudoku puzzles, and provides graphic and completely documented examples and collection reviews at all levels. Diagrams and tables that aid solving are demonstrated.  Over 500 weekly posts give complete examples … Continue reading →

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Fireworks 4 Stretches the Matched Elbow Rule.

Posted on January 11, 2022 by Sudent

After a challenging basic, we get two matched pairs on two values again, but this time, linked by a single bv. The second challenge is the application of the matched elbow rule of the last post in a more hypothetical … Continue reading →

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Building the ALS-wings of UHC 3

Posted on April 6, 2021 by Sudent

This post begins a review of examples of ALS-wings from the ultrahardcore review. The review will illustrate a DIY strategy for constructing them, that is compatible with the concurrent ALS mapping and ALS_XZ building processes of the previous posts. Ultrahardcore … Continue reading →

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An ALS_XZ Wrap Up of UHC 311

Posted on March 30, 2021 by Sudent

This post shows what it means to maintain three three ALS maps. ALS map updates are followed through a series of  ALS_XZ until a decisive coloring wrap on Stefan Heine’s ultrahardcore 311. We are exploring ALS mapping as ALS_XZ scans … Continue reading →

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Continuing the Box ALS Scans for UHC 311

Posted on March 23, 2021 by Sudent

This post continues with the box to box, row and column scans for ALS_XZ.  The C and S ALS fit into one red/orange cluster with a trap. The clusters meet in cell r7c8, showing that blue or orange or both … Continue reading →

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AIC Building Trial Follow Up for UHC 311

Posted on March 2, 2021 by Sudent

This post returns to AIC building after an encounter with a spontaneous ALS led to expanded coloring and a color trial. That will be normal under a plan of incremental ALS mapping. The confirmation of red had the follow up … Continue reading →

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Coloring ALS Value Groups in UHC 311

Posted on February 23, 2021 by Sudent

This post introduces the expansion of coloring clusters by coloring groups by grouped strong links, such as the those between value groups in ALS. This advance is especially significant as we address whether or not to exhaustively construct ALS and … Continue reading →

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A Guide Update and a Funster Kick Off

Posted on July 10, 2018 by Sudent

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

Posted on December 6, 2016 by Sudent

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

Posted on March 8, 2016 by Sudent

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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