After all, at the moment, participating in tournaments is mainly a pleasure for the players themselves. Since there are no serious prizes yet. Therefore, I really hope that when playing for themselves, players will try to avoid unfair tactics.
Now, regarding the looped battles.
I also indicated the set of saves needed for checks:
save at the end of the day
save before the attack, from which you get your battle map if the terrain plays an important role in the battle
save at the beginning of the battle - when almost no one has moved yet - to see the setup
save at the moment the battle loops
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this is enough for now, but you also need saves - before the hero gains a new skill and before taking artifacts and scrolls from caches
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I also think that these saves are enough for the check.
If there is no "cheater" message at the end, and the walkthrough is passable for any player, then I don't see any reason to overload the check. Anyway, as IronAxe rightly said, if something happens, we'll all figure it out together.
Now, I wish you good luck and don't break your mice too much ;-)