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> You can't really cheat in Chess.

At the top level, receiving a single bit of information from an observer is enough to turn the game.

That bit of information is "Your opponent blundered."

Modern chess engines can answer this question far faster than humans.

To a top flight grandmaster, even a signal indicating "think now" is sufficient. No actual variations or moves need to be communicated.

Vishy Anand had mentioned in an interview that he would be virtually unbeatable if he received a simple signal from an observer indicating that the current position is a critical position in the game.

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