270m, 10 pitches.
The obvious chimney in the top of the wall opposite the North face of the Pison is gained from the right. One pitch (the third /or 4th, depending on stances taken of 6b is short and steep, the rest is 4 and 5. Pitch 4 ends in a cave / niche obviously used by vultures. Perhaps best avoided in the nesting season? A superb adventure!
A. Rabadá, Rafael Montaner 27/Mar/1959