A KDST 595 Hidden Weakness


In KrazyDad SuperTough v.5, b.9, n.5, an almost naked triple is concealed, awaiting a single elimination. It’s not something reasonable to search for, but two systematic constructions get you there.

An otherwise anemic bypass fills the NorthEast box, but slink marking claims no more cells. Technically, the eliminations occur in the close of c5, the next line. The naked triple is a subset of c5 alone.

 NWc1 offers a Single Alternate Sue de Coq trial,  NWc1 = 1(2+3)(7+8) + 817, which was deferred.

No easy bv scan removals  but there is a skyscraper 6 chain that could have been spotted on the r5 line marking, before the naked triple eliminations.

If not, it can be picked out in the crowd on the 6-panel, or instead you might see this finned 6-wing. The basic follow up on either  of these finish Super-Tough 595

Both collapse traces feature a second, decisive  naked triple in c2, and a knot breaking hidden dublex Chdx6. Here is the skyscraper trace and its naked triple.

The finned 6-wing follow up trace has a different shape.

Next time, KrazyDad Super-Tough voume 5, book 10, number 5 finishes the updated review.

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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