Ardson Very Hard v.2 278, Plus 38 Comments

A conversation about multiple solution puzzles and coloring may be developing, as the A.D. Ardson review plods on.  On Ardv2 278, hidden pairs (naked triples) compensate for a weak bypass.  The puzzle falls to yet another XY chain.

Two regulars commented on my last post, about my travails with Ardv2 38. Dov Mittelman raised an issue on coloring cluster extensions by AIC slinks.  Guenter Todt, with a sprinkling of fairy dust, uncovered a basic solving error that may have ushered me over multiple solution barriers.  Before the follow up as the review closes, perhaps you have something to add.

Going forward with 278, an anemic bypass is balanced by a naked triples (or hidden pairs) in line marking.

For DIY without your v.2 copy, lift the givens from the grid at the first naked triple.









The strong bv field supports a long, and  decisive, XY chain. The collapse is swift, generating a steep trace, with many resources untapped.

Next, we advance 40 puzzles to 318.

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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