Suspects can be reported at this link http://support.chess.com/customer/portal/emails/new (select “Abuse” from the menu).
To discuss cheating, join the https://www.chess.com/club/cheating-forum club; discussions in public forums are routinely locked.
Using a copmuter?
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I meet a lot of players that I think makes use of a computer. They have low page rank but plays absolutely perfect. And quite obvious traits, such as when they are able to beat even, as well as the thinking for a long time ... as if they do move with the computer first ... How to get the cheaters?