Cerro Riso Patron is located 50 kilometres to the southwest of Cerro Torre, in an isolated area between the Hielo Continental plateau and the Pacific fjords. During a first attempt on the south summit (which remains unclimbed) in 2014, an accident low down on the mountain interrupted their expedition early on. Accustomed to the complex logistics of climbing in the region, the international team composed of Lise Billon, Antoine Moineville (both French) and Jerome Sullivan (half american, half french), decided to reattempt the challenge, joined this time by Argentinian climber Diego Simari (taking the place of Martin Elias). Unable to reach the foot of their initial objective, the team changed plans and shifted their sights to the main summit, which had already been climbed in 1988 by an Italian team. After an epic five-day approach, the foursome made the first ascent of the northeast pillar in three days from 22 to 24 September. This was the second ascent of the peak. Their 1,000 m route Hasta las Webas is rated ED-, with difficulties estimated at AI5+, M5, 90° and X. The first ascensionists nonetheless note that the grade takes into account the isolated location. They made the descent on the same day they summited, following the north ridge and then its flank.