Ardson Very Hard v.2 318

The review continues the pattern with Ardv2 318.

Ignore the pencil marks and pick out the givens if you have to, but try the bypass.  It gets close to the edge, leaving three 3-fill lines for box marking.







The full basic trace leaves a Type 2 unique rectangle.







A Type 2 is a form of box/line. The candidate that would remove the single extra value in two corners must go. The regular box/line removes the other 7’s in the North box.






But again, the bv playground allows the XY rail to romp, and a decisive XY chain just happens.

Hang in there, we’ll move on to 358 next week











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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