The quality of the routes is vital for a good competition. After all, adidas ROCKSTARS wants to demonstrate the skills of the international boulder elite. At the same time the route setters try to live up to the interests of spectators and the media. That asks for instinct feel. Boulders have to be set in a fair way with equal opportunities for all athletes. At the same time they should severely test the skills of the competitor: flexibility, strength, endurance, creativity, orientation. In an ideal case only one athlete masters the most difficult problem. But if the boulders are too tough,...