Oh, it's easy seeing unique rectangles without greens. One end is always a pair -- that's obvious. And then you just check for someplace where the other end could possibly be. It's not hard. Sometimes one of the other end cells matches your pair cells. That's a type one unique rectangle. Sometimes both the other end have one matching number but not the other. That's a type 2. Sometimes you see a bend or a skew -- rarely -- then you check for a bent or skewed unique rectangle. It's all pretty easy. You don't have to be able to visualize very much at once.

Done. 1 guess

Done, 1 lucky guess.

start

g/g ; unlike yesterdays that had an easy coloring chain of 4 (similar to UR :-))

I hope no one discriminates against those of us who are forced to use types three and four unique rectangles and non implicit virtual tandems and seldom cross-hatch

done

Solved like an easy with greens. That usually doesn't happen with me!

done, second guess

Difficulty score 56.

There was an opportunity for using the Nishio technique, but I was able to find the correct starting point for the forcing chain to solve things more conventionally.

go

hmmmmmmm- almost done, and another re-start, dementia?

done

hmmmmmm - same as before, must have been clicking too fast toward the end there :(

dng

Done