In reply to Offwidth:
You forgot Chris Doyle: Final Cut in Parasellas. That's got to be a very strong contender given it's location and it's link up of known and established problems.
But I don't think it's relevant to say what's going to be what decades in the future. With the inevitable grade slippage that might be many of the folk who have only climbed 8b in today's grading.
Unrepeated problems are going to be a bit suspect, unless they've received a lot of attention by capable climbers, because new sequences are often found. Not saying they shouldn't count though.
Maybe a better question would be has anyone done more than one? Horizon was this guy's third.
Post edited at 11:24