You don’t need a faraday cage if you suspect he gets the moves from outside. Just put a 20 minute delay to the video feed and don’t allow random people in the room.

he could be sending info out of the room by clenching whatever muscle. Need Faraday cage.

With no visible or audible audience either.

Well, a vibrating device can be anally inserted. So maybe the Faraday cage is enough, unless we will be doing cavity searches.

this is really the only way (maybe not naked, but change into preapproved uniforms)

Eve Babitz played artist Marcel Duchamp* naked. Perhaps clothing optional? ;-)

https://www.artsy.net/article/artsy-editorial-marcel-duchamp...

ok but why not, let's do it the classic greek way

you’d need a cavity search too (seriously)

What do you do about subcutaneous implants?

MRI scanner.

You could still run a chess engine offline on a decently powerful phone that would beat high rated players afaik.

Run an emp in the room before starting the game?

Finally, a practical use for tactical nuclear weapons.

Where are they getting a phone from in this hypothetical scenario?