Discussion about Heroes I.

The trick is that in some maps, if you do this, all the Castles will go to one opponent. Also, it is not recommended to make opponents of different strength instead of all strong ones; this will lead to one of them dominating the others.

Yes, I agree that there are maps where one AI controls all the Castles and creates a complete mess.
Regarding AI opponents of different strength, it is clear that the "smartest" one will dominate, but in that case, don't forget to put a "check" on "king of the hill" (so that there are AI in an alliance) - then one AI will not dominate; it will not be able to take Castles from weaker ones, but there is a feature in Heroes 1 that even when in an alliance, you can attack an ally... I remember provoking them like that...
...you look for a narrow passage and catch two AI heroes there, and you either use a secondary hero or an empty Castle to provoke them; the main thing is that the AI that moves earlier is blocked by the AI that moves later, so it will be forced to pass and attack the ally.