[FartyMcFarter]

If one really wanted to cheat with a computer, I imagine it would be better to only carry around enough hardware to communicate wirelessly with it, rather than the whole thing.

This would be harder to detect as the amount of hardware would be much smaller, and it would allow using a more powerful computer.

[grog454]

How do you prevent the detection of that communication?

[FartyMcFarter]

Does one need to? What kind of radio detection do chess tournaments deploy, and do perform it constantly around every player?

[teaearlgraycold]

Subspace technology

[Cthulhu_]

Quantum entanglement