Aidan Roberts has repeated Alphane (Font 9A) at Chironico, in Ticino, Switzerland. The problem was put up last year by American climber Shawn Raboutou but it wasn't until this summer that he announced the ascent.

Writing on his Instagram, Aidan said: 'This one was a pretty amazing experience to live. As with almost all of climbing, that one attempt where all the factors fall into place, that moment of flow where moves feel effortless, when time feels irrelevant, it makes up but a negligible fraction of our experience. And yet this attempt often holds all of the power over our stories of success.'

Aidan's training is becoming legendary and he's known to go to great lengths to train specifically for certain boulder problems. For Nalle Hukkataival's Burden of Dreams, also Font 9A, he scanned the holds and 3D printed replicas to train on. On Alphane, Aidan wrote:

'Alphane however, was a pleasure throughout. Every day of effort, on rock or replica, felt to bear fruit with lessons of subtleties in movement, intricacy of holds and optimising mindset. I've got nothing but positive memories surrounding this climb and lots of days sharing methods with friends. It feels as though every session has been a success, almost a shame that there won't be more to come!'

Alphane was the world's 4th 9A after Nalle Hukkataival's Burden of Dreams, Daniel Woods' Return of the Sleepwalker and Simon Lorenzi's Soudain Seul. It is now the second to have been repeated with Soudain Seul having had three ascents in total.

Will Bosi and Aidan have both previously climbed Font 8C+ but Aidan's repeat of Alphane is the hardest a British climber has bouldered. He is now the 7th person to have climbed the grade.