The first stage of the tournament "named after Van Kanigem"

I think it's unlikely to happen once a day, it's practically IMPOSSIBLE!
I haven't encountered such a situation, but if I do, I'll keep reloading the save until the computer doesn't attack.

It's unlikely to happen to you because in that situation, you'll be calculating the result based on the table and won't be subtracting a day, so there's no point in anyone trying to manipulate the situation and deceive the judge. You just need to check if you can reach the computer on your turn and defeat it ;) if the computer completely refuses to let you attack.

6. The submitted save must contain only one hero who performs the last action (the others must simply be dismissed).
This point contains a certain idea, i.e., an additional mental challenge for the player. They need to try to play in such a way as to demonstrate both an optimal result in terms of speed and good characteristics for the hero who makes this last move!
Therefore, advice to everyone:
ALWAYS make the last move with your main hero! This way, you will eliminate the possibility of dismissing him in the final!

I agree. One point. If I make the last action, for example, by attacking with my powerful hero, then after the battle, I am given, let's say, a skill. But after that, we go to the table. QUESTION:
Do you take into account the skill gained by the hero on the last turn! Or do you take THIS data from the save before the last attack? Maybe there is an exception among the players? Some consider the skill gained on the last turn, while others don't (they forget, for example)? Please explain this important point to everyone.

Regarding two heroes:
We are not looking for easy ways ;)

We are too :) In my case (regarding the suggestion about two heroes), I need to think of a strategy so that I always finish the game with a supporting hero. This is, of course, if you don't count the skill gained by the main hero on the last turn. That is, the powerful hero should continue to level up on anything until the last point - and then pass the troops to the supporting hero to finish the game. So, until you give a clear definition of how the skill calculation works in your case, it's too early to say which path is easier? :) But in any case, it's easier to deal with a situation with one hero than with two. I just need to know what I asked about. This should also be included in the rules so that there are no questions.

1. I believe that a player who submits their final save made on the same day has an advantage over a player who submitted their final save during a turn transition. And this is obvious! Do you disagree?
2. If the developers had taken into account the possibility of not counting this day during the turn transition, then the days would be counted as you say.
3. I will not change the rules, so I will count the number of days based on the table that is displayed after the victory.

This is a fair decision. I agree. And it also reduces the hassle during checks, which is undoubtedly a plus.