Spoiler Alert. This is a really tricky move. Don't read further if you'd like to find it on your own. And I'll try not to be too specific. Here it is. Stop reading unless you are really frustrated. A unique rectangle sets up a pair which sets up a loner. Nice!
Did it, no green, no guess. It had another nice move after that one. Other than those, easy. 30.
Didn't feel like a hard, no tricky moves. No greens.