[gnramires]

Honestly a Faraday cage should be a very good defense against most attacks including this one. Moderately expensive for a good quality one, probably only affordable for high stakes tournaments (it shouldn't be expensive in terms of materials: a very simple sheet metal cage with adequate electrical connection technique should be enough, but I assume it's too specialized to be cheap -- plus care must be taken with openings and ventilation).

Edit: I believe at the moment it's still necessary a fairly large device to run the best engines which can't be concealed (?).

Edit2: Oh the engine is running on the Pi 0! Impressive.

[crtasm]

This is running locally on hardware on his person, a faraday cage won't help.

[tiborsaas]

A tiny bit of airport security would rule out the rest of the cases :)

[seirim]

I think having competitors pass through metal detectors would be helpful.