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I confirm, as I wasn't theoretically prepared (regarding the strengths and weaknesses of the towns), I allowed for some randomness, at least in one battle, but the opponent refused. I was playing for the first time, and my opponent had already won on Warlock. He had the fastest towns, plus 3 stacks of decent archers, while I had the opposite – slow towns.
That's why we're here, to prepare theoretically, some at a higher level, some at a lower level. Look at all the towns and find their strengths and weaknesses. In a random game, when you choose bonuses and prepare for battle, you're guided by something, right? I don't believe you're doing it completely randomly. The same system applies to playing as Warlock, but it's up to the two of you to decide who plays as which faction, not what the computer throws at you.