The top US climber, Dave Graham has climbed 'the hardest boulder problem in the world', Dreamtime (8c/V15), at Cresciano in Switzerland, according to RockandIce.com.

The problem ascends a 45-degree granite face on small holds leading up to a huge jump to a sloper, which is followed by a taxing finishing mantel. Graham worked the problem over the course of the past month, falling repeatedly on the jump. On day 10 of attempts, he pulled it together to get the third ascent.

Fred Nicole did the first ascent in 2000, with Bernd Zangrl repeating it by lamp light last April.