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Monthly Archives: June 2020
Ultrahardcore 3 Falls to Coloring Trials
This post reports coloring trials that gain the solution after forcing chains when Sudokuwiki gives up. This includes an example of a grid diagram illustrating the route to contradiction in a breath first trial trace. Then we close with a comment … Continue reading
Ultrahardcore 3 Schlagt Forcing Chains
In this post, we continue with Sudokuwiki into forcing chain methods, and their relevance to the ultrahardcore theme. Sudokuwiki stalls, as Stefan predicts. Then we fashion a trial for a logical, but practical outcome. On the grid after the red/orange … Continue reading
Cell and Unit Forcing Begins in Ultrahardcore 3
This post reveals yet another way to start a boomerang, and reconsiders the practicality of Andrew Stuart’s Cell and Unit Forcing Chains, this time facing an ultrahardcore right page. We get to a choice between Sudokuwiki and a coloring trial … Continue reading
Utrahardcore 3 Lifts Off
The review of Sudoku ultrahardcore 1 right pages, a separate collection from (and tougher than) its left pages, begins with number 3, shown here post before last. In this post, we follow Sudoku Basic and the Andrew Stuart’s Sudokuwiki solver … Continue reading
A Bracket Busting Dave Green 4-Star
Here’s the basic trace on the Saturday Dave Green 4-star shown at the end of last week’s post. It survived the three Sysudoku Basic phases: bypass, box marking and line marking. It’s the first I remember. Let’s talk through the … Continue reading
Systematic Sudoku 