The UHC 265 Wrap Up


This post continues on the solution path for left page ultrahardcore 265. We begin where we left off, with the two solvers synchronized and with the first preliminary coloring cluster on the grid.

AIC building begins with this boomer from 5r3c3, followed by

Next, a 3 – ANL creates a productive NE48,

a 7 -ANL brings two clues,

and a 5 – ANL adds two bv. A hidden unique rectangle is carried by 5 – slinks.

With this wide ranging 9 – ANL, I looked for a green cluster candidate seeing a 9 for another removal, or a lite trap.

After Beebe finds this 6 – ANL, it’s clear that green 8r9c2 makes 6r7c3 green lite, and the two removals are lite traps. One creates naked pair r3s49.

Expansion traps 4r4c4 and 3r1c8, then a cluster shortcut ANL removes 1r8c2.

After the expansion, maybe you find the ANL removing 8r8c4.

Or maybe you see it as a green lite trap.

Anyway, the expansion brings a trap and the trap, a SWr7 boxline.

.One more expansion and pick your shortcut from blue 5r6c2. Either to green 1 that sees 1r7c7. Or to 1r8c9 that removes 1r2c1.

With that, the expansion wraps green in r8 and c6.

Next time we start left page ultrahardcore 309. Are we stopping there with 10, or going for 12? How many long, multi-post two solver DIY technique solution paths can you stand?

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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