Possibly the only real black run was the famed Og God ( no. 27 ) from Eigergletscher. It is accessed by a very long T bar ride; its start is deceptively easy; then it is a proper black run, which in flat light or badly churned up snow makes it very difficult which was the experience in my 1st run. On the 2nd and 3rd occasions the conditions and light were perfect as in the photo and it was easily skied.
