Hans Steykal and I climbed the Southwest Ridge of the Zinal-Rothorn starting at the notch about the mid point in the ridge (28 pitches, IV, 5.7). Crux is in chimney on north side above 13,000 feet. Approach from the Rothorn Hutte involved crossing 3 glaciers, 1 tricky Bergshrund and 4th Class rock. We descended the normal route (Southeast Ridge), which comes towards you in the picture. Our time hut to hut was 14 hrs. Epic descent hike (on rubbery legs after eating a meal) back to Zermatt occurred because we had to be in Chamonix the next day (7/90). Photo was taken from the summit of the Riffelhorn, which I soloed the day before and the same day Hans and I hiked up to the Rothorn Hutte. I had younger legs back then.