Not sure if this is a problem or it's supposed to be that way but it doesn't quite feel right. It seems the "low mountains" (darkest grey mountains) now require "special equipment" to climb. But to me, it would make more sense if the mountains followed a pattern like:

1. low mountains (darkest grey): no equipment required (note that real-life mountains don't always take special equipment to tackle either), perhaps just Climbing skill(?)
2. mid mountains ("middle" grey): here you need special equipment
3. high mountains (white): here you need something even more ("magic", perhaps? As these correspond to the mountains "too high to be scaled without magic" in ADOM I)

Not sure whether to call this a bug report or request for a feature, either. But the above seems more natural (it gives a nicer progression), and makes more of a distinction between low and mid mountains. Now I know that magic is still a ways off, but the climbing of the low mountains without equipment could be put in now.