Tag Archives: ALS wings

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 →

Posted in Extreme Solving, Sudoku Toolware | Tagged , , , | Leave a comment

UHC 355 Provokes a SASdC Trial

Posted on November 24, 2020 by Sudent

After a typical ultrahard Sysudoku Basic, Sudokuwiki starts with an APE so unusual as to change my working definition of the APE. APE stands for Aligned Pair Elimination.  From every example so far, I thought it was the two elimination … Continue reading →

Posted in Extreme Solving, Heine, Puzzle Reviews | Tagged , , , , , , | Leave a comment

Preparing a Pattern Trial on UHC 179

Posted on September 15, 2020 by Sudent

This post does Basic and reports humanly practical results from the two review solvers on  ultrahardcore 179. Then for a stall breaking trial, we turn to  the limited value patterns, and their discovery through the X-panel view and freeform drawing.  … Continue reading →

Posted in Extreme Solving, Heine | Tagged , , , , , | Leave a comment

Hodoku ALS Chains

Posted on January 5, 2016 by Sudent

This post explains the Hodoku ALS wing and chain as special ALS node AIC ANL with toxic set groups defined by ALS nodes. This is how they should be constructed, so as to leave the mind’s door open for more … Continue reading →

Posted in Advanced Solving, Expert Reviews, Hobiger | Tagged , , , | Leave a comment