In reply to fmck:
There is very obvious square cut gully/chimney on the flanks of the (IIRC) most easterly peak on the Aonoch Eagach ridge. There is a huge Y shaped gully/colouir and it goes straight above the where the branches of the Y meet. I heard back in the 90s people had tried it but never got it up it. Don't think I've heard of it being climbed since then. It's low and south facing so I guess its not often in good winter nick. It also sort of just fades out into the hillside above, but still it's a bloomin' obvious line you can see from most points on the three sisters side of Glencoe.
