St Anton am Arlberg the Steissbachtal trail just above St. Anton. The groomed runs in the region cater to all levels; 43% are for beginners (blue), 41% for intermediate skiers (red) and 16% are for the more advanced (black). There are also of deep snow runs in the area. Expert terrain includes less-frequently groomed ski routes such as Schindlerkar and Mattun, and the backside of Valluga () down to Zürs, which is for experts only if accompanied by a guide. There are also a large number of off-piste routes in the area that experts can explore with the help of a guide. Other ski
Expert Simon and Kevin Gilmartin proposed a model of learning in chess called MAPP (Memory-Aided Pattern Recognizer). Based on simulations, they estimated that about 50,000 chunks (units of memory) are necessary to become an expert, and hence the many years needed to reach this level. More recently, the CHREST model (Chunk Hierarchy and REtrieval STructures) has simulated in detail a number of phenomena in chess expertise (eye movements, performance in a variety of memory tasks, development from novice to expert) and in other domains. An important feature of expert performance seems to be the way in which experts are able to