Nagan-4
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very bad, there will be hints, spying, and so on.
If a person wants to give a hint, they will give one, and there's nothing you can do about it... at least reduce them to an acceptable level. Though for a tense final battle, a referee would be fitting.
And about spying — how much of a vile rat do you have to be to watch and go snitch? In principle, the gaming zone is divided into two. People from St. Petersburg and Moscow are in one zone, with guests also registering there. They won't have to suffer from boredom — there will be 14 games before their eyes.
"The rest of the world" sits in another zone. If that makes the players feel calmer — then so be it.