Tag Archives: ALS AIC node

UHC 309 Rounds the Bases


The ultrahardcore review solvers illustrate a diverse solution path, before and after AIC and cluster building. Here is the grid after the bypass and box marking. Beeby found a naked single SE4 in r8c7 in its basic. The Sysudoku Basic … Continue reading

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

Ultrahardcore Review ALS-wings II


The  ultrahardcore ALS-wing survey continues with examples from UHC 47. The survey illustrates how ALS-wings are found as ALS are added to ALS maps. Continuing the survey into a second review puzzle UHC 47, the reward is this well laid … Continue reading

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

Ultrahardcore 91 Trials Unleash Beeby


Here is the basics launch on Stefan Heine’s ultrahardcore 91, which quickly runs my two assisting solvers out of humanly practical removals. A Single Alternate Sue de Coq  trial reduces two clusters two one, and produces  two critical clues. In … Continue reading

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

Hodoku Chain Building


This post endorses Hodoku’s explanation of strong and weak links, regretfully confined to chains. His discussions of grouping and ALS nodes are supplemented for completeness. Hodoku graphic representation of chains by cell shading and candidate coloring is seen to be … Continue reading

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

The ALS Node in the AIC


This post explains how an Almost Locked Set, an ALS, can be a node in an AIC, providing a slink between two winks connecting candidates of different numbers. In this blog the ALS was first applied in the Sysudoku version … Continue reading

Posted in Advanced Solving | Tagged , , , , | 3 Comments