Tag Archives: AIC building

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

UHC 177 Stretches It Out


In this post, Heine’s left page ultrahardcore 177 gets from one cluster wrap to two more in a long series of AIC and boxlines. Also included is the review table for uhc 1 -177. Continuing from the green wrap of … Continue reading

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

Recycle AIC Building on UHC 311


This post shows how the AIC building done by the review solvers on ultrahardcore 311 can be systematically duplicated by a human solver. The technique is a graphic one, very amenable to ©PowerPoint graphics, and slink marking of Sysudoku Basic. … Continue reading

Posted in Uncategorized | Tagged , , | Leave a comment

A Lite Update on Castillo’s Only Extreme 347


This post updates a solution by coloring trial in the review post of 12/19/17. A bypass of 6 4-fills resolves 3 of them immediately,  but goes no further than the original 3-fill only bypass.  Then we follow Beeby through a … Continue reading

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