In reply to alj:
I've been in doubt about whether I did Icebreaker for a few years now. Originally, I didn't know about Icebreaker, so thought I had done Fifth Horseman. I found out later that someone had squeezed a new route in to the right. I've never taken the tick off Fifth Horseman, because I didn't think it felt like E2.
I climbed straight up, to the right of the arete using the lone pebble, but without actually using the arete. The move did feel sketchy and exposed, but like I say, not E2.
If I did do Icebreaker, then I'll be glad to get confirmation of my only E2, albeit several years after the fact.