Ardson Very Hard v.2 158

After a one week pause, we continue the A.D. Ardson v.2 review with puzzle 158.

If you don’t have your copy, just load one from the Calibri font givens here, and do your own solving. Then compare with this checkpoint. It arrives with line marking almost done along the rows, and a productive 4-wing.

The basic trace, gets us to the next grid.

The ample bv field yields no UR’s or XYZ-wings for me, but there is a completely decisive XY chain.

Next is Ardv2 198, from A.D. Ardson Very Hard Puzzles, v.2

About Sudent

My real name is John Welch. I'm a happily married, retired professor (computer engineering), timeshare traveling, marathon running father of 3 wonderful daughters and granddad to 7 fabulous grandchildren. The blog is about Sudoku solving. It covers how to start, basic solving to find candidates efficiently, and advanced solving methods in an efficient order of battle. It is about human solving methods, not computer solving.
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