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

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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