In February 1965, Bonatti tried with two companions to climb a new, direct route on Matterhorn Nordwand (north face) but the team was turned around by storm. Back in the valley his two friends had to leave. He considered his options then set off on 18 February 1965 for a second attempt alone. Five days later he emerged on the summit, having completed a demanding climb of 1.200 metres rated ED+. This climb has been since rarely repeated solo and in winter, the three most notable repetitions being perhaps: