Here’s a short video offering a plausible means by which a player could cheat in a tournament setting with a low probability of getting caught. I’m not sure how close one’s confederate (or one’s computer) must be for the Bluetooth connection to reliably work, but even if the range is pretty limited it’s going to be extremely difficult for arbiters/tournament directors to monitor everything and everyone without engaging in invasive searches.
I was hesitant to publicize the video (though of course all my readers are scrupulously honest), but it’s likely that in a general way many readers already knew about this in a general if not a specific way, and those who are really determined to cheat will easily find the info they need on the interwebz without my help. But the main reason why I mention it is that the better known these methods are, the sooner the good guys can come up with some solutions - and the sooner they will be forced to find solutions. There is Bluetooth jamming, for instance; those of you who know more about these matters are invited to weigh in. Is jamming effective and affordable? Will the black hats be able to work around that without bankrupting themselves?
No, it's not that I'm scrupulously honest. It's just that I don't see the fun, for a few reasons. In the 40 years I have played some games amd moves I'm proud of, but how can I be proud of computer moves? In corr. it worked as long my opponents used computers too and my input was essential. But it isn't anymore; predictably winning chances have become about zero.
The bottom line is that I play for myself, not to build a fake imago for the audience.