Tactics for playing as the Dwarves.

Having two schools of magic for a Dwarf is pointless, and what about leveling up a super skill? It requires two schools of magic: Chaos and Summoning. At the beginning of the game, I don't think any magic is very effective, and there's not enough knowledge or spellcasting.

In my opinion, leveling up to a super skill is one of the worst options for a Dwarf. First, there's Summoning, which is rarely available, and it's not very useful (although, the Rune Shield can be quite helpful, but is it worth leveling up an entire school of magic for just one spell? At best, you might get 1-2 low-level creatures in the guild). Chaos without Education and/or Sorcery also doesn't look very good (it won't give a big spell power bonus, and the hero rarely moves). But Defense with Readiness looks very appealing, and the super skill itself will give an advantage over some other super skills. But I would only level up this way if I found a mentor on the map and retrained the hero...

Added after 6 minutes

Personally, I don't really like taking Keen Mind.

Returning to the topic of the importance of Keen Mind. Look at the replay of a player; it seems that his hero had Keen Mind, because the hero moved before the Knights of Isabel, for example. And this affected the course of the battle.