[gs17]

> I considered that you could have vibration sensor plates under player's feet but I can imagine several ways this "doesn't work":

There's also no reason to expect the shoe form factor to be used repeatedly. One cheater was accused of morse code blinks, although he also had a camera on him [0]. When people talk about vibrating shoes there's always someone joking about a wireless buttplug instead, which would probably not show up in the mmWave scan (I don't know exactly what they look like but I doubt they have huge antennas sticking out). A Faraday cage would go a lot further for the price than airport style scanners IMO (and make every match a cage match, which makes chess sound way cooler), but it's probably still overkill.

[0] https://www.news.com.au/sport/sports-life/chess-players-extr...