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Well athletes are required to provide urine samples and sometimes at random inconvenient times.

For chess, maybe your rating doesn't mean anything until you've gone through a "verified" bunker-play tournament that operates as a sort of baseline for your ability at all subsequent games until the next one.

To me seems as though chess pros play for the sake of playing. Perhaps this bunker could be placed somewhere secretly in Hawaii and the GMs could be flown out for a free vacation with family.

Stream it and make money?

If you're streaming it, it's not exactly a secure chess bunker is it?

If information can only go out and not in, maybe?

True, assuming you can know for sure it can't come in. You could just delay the information coming out by a few moves so that even if it can get back in via an accomplice watching the game, it won't matter