3891m. Cross the bergschrund on the right (quite steep) to the left of a serac and make a rising traverse left to follow the couloir which leads all the way to the summit. 50-55 degrees.
Route is number 13 in the topo at this link:

J Biju-Duval, G Sourice, J Traynard 06/Jul/1971

HamishD ?/Oct/09 Solo O/S

Not a classic by any means but worthwhile little route for a short day, particularly if your friends are on the normal route! Quite a bit of grey ice in October in which case prob safer grading it D.

High D-
Mid D-
Low D-
High AD+
Mid AD+
Low AD+
High AD
Mid AD
Low AD