Beat Kammerlander is one of the world's best sports climbers of his generation and has contributed significantly to the development of climbing, especially in alpine terrain. His first ascent of Unendliche Geschichte in 1991 in the Rätikon was the first alpine sport route in the upper tenth UIAA grade. In addition, his route Silbergeier (difficulty X+ (UIAA), 1994) was for years one of the three most difficult alpine tours in the world, the trilogy, until Alexander Huber was able to climb an even more difficult route with Bellavista on the north face of the Cima Ovest di Lavaredo in 2001.