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

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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