Question: Which mountain is highest, Saltoro Kangri or Gasherbrum IV?
Sentence (from "Walter Bonatti"): He was noted for his many climbing achievements, including a solo climb of a new route on the south-west pillar of the Aiguille du Dru in August 1955, the first ascent of Gasherbrum IV in 1958 and in 1965 the first solo climb in winter of the North face of the Matterhorn on the mountain's centenary year of its first ascent.
Relevant evidence: No