Cheating these days would be so easy, I remember a story about the Karpov Korchnoi match when Korchnoi complained that Karpov received coded messages contained within the flavour of yoghurt he was having delivered to the board.. It was eventually decided that Karpov could only have blueberry,and only at seven o'clock.. I think it was the same match that Korchnoi employed 3 mind control guru's to fixed their gaze on Karpov and put him off with their incredible metaphysical powers...
But back then actual cheating would've required the collusion of (and as were talking about the world championship) presumably weaker GM's
These days anyone could stand at the back of the tournament hall with his hand in his left pocket, or his baseball cap tilted to the right. Super players like Kramnik are not gonna need to have every engine move after 1e4. Ofc not they are gonna be able to play the majority of the games themselves. Only in key critical positions would he need to run his right hand thru hi hair to call for a move. And there I am standing at the back of the hall with my hands behind my back signifying the knight is the piece to move and the player would know what this meant in the context of the game... How could this possibly be detected? It can be a lot more subtle than Danilov making phone calls and scratching himself profusely in front of topalovs board.
Match rate being a fledgling tech like a poster above mentioned is irrelevant, coz a player like K would only need to do it one or two times per game.....if their position was worse, and never if they had a favourable setup.
How could this possibly be detected? Is it time to lock them in a sealed room during games?
There was some people who colluded to do this very thing and have gone on record as to how they did it but, by implication, it is suggested that they all do it, if one super gm is doing it.
I have in the past suggested that the participants get a cubical where the crowds can't see them and vice versa, the zone for the games would include an electronic interference to jam all phone or pager signals, with the players prechecked for electronics upon entry and having a seperate restroom facility from the crowd. It would be interesting to see if the numbers dropped in these games as compared to the recent past's tourneys.
Have people watched Kramnik's press conferences ?
It looks like it's hard to admit for some that he is simply a chess genius... (but still makes mistakes)