On the boulder with Le Premier Pas (red n°1), underneath Big Jim. Low start with underclings and finish with the right arete, a spike and pockets.
Update (March 2015): the upper undercling has broken off but the problem has been done again by Guillaume Glairon-Mondet, who proposes the grade of 8a+/8b (to be compared with the initial grade of 8a/8a+).