Contact chess.com with a link to either the person's profile or the game that you played. Then write a message explaining why you believe he cheated. Good luck.
Cheating
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If 1 person makes the accusation, chess.com just files it. If many people make the accusation, chess.com looks into it more deeply. Chess.com takes cheating seriously, but there's a list of people who have been banned for cheating, and they come back with different accounts. Its the revolving door of law enforcement.
Si tu as de fortes suspicions sur un joueur, envoie-moi un message et je m'occupe du reste 
Was it really necessary to necro an 18 month old thread just for that?
wanmokewan wrote:
Was it really necessary to necro an 18 month old thread just for that?
Every step we take to better fight cheating is a step in the right direction. Considering the amount of junk in chess.com forums, I don't see the problem
I thought they stopped posting that list? If they are wrong,wouldn't it make them guilty of slander,and libel?
Do you track cheaters? What's the process toi follow when we strongly suspect that a player cheated?
Drajkar