Chacraraju South Face Solo, 1979. The French climber Yves Astier made a new route solo on the south face of Chacraraju on May 24, 1979. The route ascended the couloir to the right of the one ascended in 1977 by John Bouchard and Marie-Odile Meunier. It reaches the ridge at the low point between the summits. Astier is quoted in La Montagne as saying that these are the two most difficult ice routes yet done in the Peruvian Andes.