Start on the two good side-pulls on the arete and climb up to about 8ft, traverse right on a line of crimps (below the lip) and finish on The Flake Right. The first crux is making the match on the crimp on Side Pulls. The second crux is making the rose move with your left to the horn on The Flake Right.
Best way I found- pull a couple of big shouldery moves down into the start holds for Sidepulls and then go up to the crimp you have to match. Done this way I think it is about V6-7. Good problem, uses some holds that don't see a lot of use!
ahh so you climbed under the first crux. The line i did was across the upper rail of crimps. when i found the line, i was basing the beginning around that match. so it sounds like you didn't climb my Treyverse. it sounds like you climbed a lower variation. I that its fun to do that piano match.