Backing up to a 5-fill


Here is the Akron Beacon Journal CREATORS of 3/30/22 at the end of tracing the follow up of a 5-fill. Scanning for 5-fills is not productive. Too many, and they almost always fail.

But this time, 4 of the 5 free cells of c7 see a given 2. It’s a 5-fill with a clue. From here at C5, the solution places itself.

The follow up trace has three more 4-fills and five resolved 3-fills.

Next week’s  ABJ Creators Gold gives a choice of 4-fills for a bypass solution. We might not pick the same one.

About Sudent

I'm John Welch, a retired engineering professor, father of 3 wonderful daughters and granddad to 7 fabulous grandchildren. Sudoku analysis and illustration is a great hobby and a healthy mental challenge.
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