It wouldn't do much good since Stockfish could easily run on a raspberry pi or similar inside of that, say, in a player's shoe
yes but your ability to detect rf noise from electronics, even well shielded electronics, is greatly enhanced in that environment.
or better yet... follow the wikipedia model and have a parallel cheater chess league where there are cash prizes for proving after the fact that wins were the most sophisticated and undetectable cheats.
that would make the games themselves extremely boring, which makes it no longer really a game of chess and more like the Penn & Teller Fool Us show but more specific.
Wouldn’t the raspberry pi have detectable EM radiation? Not from comms but from the normal operation of the board?
would a rpi+battery trigger a metal detector though ?
Some comfortable clothing could be provided by the tournament organizers, making a lot of cheating strategies impossible.