Monthly Archives: August 2021

A UHC 45 Discontinuous Nice Loop Seminar


Heine’s left page ultrahardcore 45 offers a host of examples illustrating when a Beeby “discontinuous nice loop” is and isn’t a 1-way. Coloring closes the class. UHC 45 has a remarkable number of bv and line slinks, given the monster-like … Continue reading

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Pattern Analysis with Coloring on UHC 1


Coloring can be combined with freeform pattern analysis to determine a small set of pattern trials for Heine’s ultrahardcore 1. Typical choices for this decision are reviewed. A single trial produces the solution. For this we go back to the … Continue reading

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Single Alternate SdC on ultrahardcore 1


This post reports a rare outcome in an SASdC trial, the extra term carrying through to a solution. Here is the grid with NWc1 marked as a Single Alternate Sue de Coq chute. The contents of the wall can be … Continue reading

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Heine’s ultrahardcore 1 Starts the Review of Left Pages


This post whittles on a tough grid, duplicating results of the two solvers by different means. When the solvers stall, we find a Single Alternate Sue de Coq for readers to try. Sysudoku Basic brings four clues and  slinks, but … Continue reading

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Coloring KDST 5 10 5 is Too Easy


The bypass almost finishes KrazyDad Super-Tough v.5, b.10, #5, whether or not you start with the 4-fill and two 3-fills. Here’s my 4-fill version. Line marking is minimal, and coloring on the few candidates remaining wraps green in r6. With … Continue reading

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