Vertical drop: 2 400 m
Technical difficulty: Very serious Exposed traverses. Complex route finding. Need to be stable snow-pack. Crevasses.
This line starts like the Classic Girose. Start at the top of the second Trifides drag-lift alt:3550m. Ski down directly north in the middle of the glacier, keeping an eye to the Ruillans station and the Muretouse peak equidistant either side of you.
Just before a short flatter section, go slightly skiers right hand angle to get to a steeper dome face slope. alt: 2800m. Keep skiers left just under a higher rock-face with seracs. Ski down this "pleasant slope" 35° to the end of glacier tongue and stop skiers right, just below a rock face that will protect you from avalanche or seracs fall.
Carry on through a series of bowls and to a large couloir. Just after the couloir skiers left there are a series of smaller traverses that will take you to a long travers towards a very distinctive square rock called "Rocher Carre" that lies in the middle of a big exposed slope.
Stop right under the rock and rest. Continue straight across to the ridge. You find the instep of the couloir de Maisonneuve on the other side and it is necéssary to use two 50 meter ropes. It is a free elevator drop of cirka 1000 vertical m. Steep and narrow 40-45°, As any couloir the snow transforms day by day, hour by hour, risk of slippping on hardpacked snow, ski very conservative in the top section. Attention for windslabs on the traverse just before the couloir.