Dirty_Player
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The most realistic option for this tournament would be to introduce a verbal ban (no one has considered this option).
After the main time has elapsed, if a player is in battle for more than 20(?) minutes, the opponent has the right to demand a quick end to the battle (Q).
That is, if you want to drag out the battle by moving golems around the field, or simply waste time calculating every move, you do it at your own expense, not at the expense of everyone else.