243. Chattu via the Southwest Ridge (combined route, category 1B difficulty, Fig. 18, 28).

From the "Bashil" tourist base, follow the left bank of the Bashil River upstream through the gorge until you reach the stream from the Chat glacier. Here, turn left and ascend along the stream's edge to the tongue of the Chat glacier. Approach the icefall via the glacier, preferably passing it on its right side. Above it, cross the snow bridge over the bergschrund and ascend a steep 100-meter ice-and-snow slope to the Chat pass. From the "Bashil" tourist base, it takes 5–6 hours. The path from the "Chegem" tourist base to the Chat pass is described in route 242.

On the pass (when ascending via the Chat glacier), turn left and follow the ice-and-snow saddle of the pass to reach the Southwest Ridge. Traverse the heavily damaged, long, and occasionally snow-covered easy Southwest Ridge of Chattu, bypassing numerous rock pinnacles on the right (loose rocks, protection required), to reach the summit of Chattu. From the pass, it takes 4–5 hours.