Degrees of difficulty

MS Intermediate skier
BS Good skier
OS Very good skier
MSA Intermediate alpine skier
BSA Good alpine skier
OSA Very good alpine skier

An “A” will be added for routes where difficulties require adequate mountaineering knowledge and gear to be tackled.  

In this case, we refer to the alpine grading system: F – easy, PD – slightly difficult, AD – somewhat difficult, D – difficult, to assess how sustained the difficulty is.

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