Earlier quoted context omitted.
Nobody knows how he was cheating. Without a strip search there's no way to be sure. It is known that it's not technologically impossible. There are ways to do it, some of them rather outlandish but not infeasible. Unfortunately, that's as far as it can go. Either you start doing something really extreme to ensure that players can't cheat (that aforementioned strip search, making them play in a Faraday cage, etc), you…
> Even worse than that, the cheating may not have gone on during the match. It could have been as simple as old-fashioned spying: studying what preparations Carlsen had made, and learning their weaknesses before the match even starts. How is that even "cheating"?
I'm not saying it's likely. I'm just explaining what I meant. Those preparations are private, and getting inside intel is cheating.