Aargh, nasty. First two threads had to be reversed; third one appeared inconclusive, reverse of it had a conflict and going back the other way finally cleared it.
multiple incorrect guesses; finally got it. nasty one.
used greens along with several guesses!
With about 3 God-blessed guesses, finally finished!
i having the troubles.
i think this is the hardest one ever
Finally done with greens and multiple guesses! Not much fun -- I prefer puzzles that make me feel clever!
Done with greens
Maybe I made a lucky mistake along the way, but I discovered a locked pair, and after that there were a couple of obvious mutually exclusive threads to pull. First one didn't get far, so I tried the other and the whole thing unraveled.