Yeah, the article doesn't mention it but it is likely that you could run Stockfish on a smartphone or so to get good moves without any form of connectivity. (The main problem, I suppose, would be that you would have to feed it the other player's moves somehow, whereas with connected devices someone else can do it for you.)
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Just curious: why don't they play in shielded rooms instead? I'm quite sure they are not cheap, but they would be far more reliable.
This method will work only until cheaters up their game (pun intended).
Yeah, the article doesn't mention it but it is likely that you could run Stockfish on a smartphone or so to get good moves without any form of connectivity. (The main problem, I suppose, would be that you would have to feed it the other player's moves somehow, whereas with connected devices someone else can do it for you.)