there are players here that cheat on time , SWINDLERS ! One of them is USA player " crockettyessss" , who can manage your time and ensure a win on " time lag" for himself . And more : he implants some software / virus to your PC so that this procedure keeps on in your next games. Bevare of this player and please chess.com admin/ moderator clean this fine site from such dirt !
pilot
They ban people after the cheating has happened. They can't prevent a person from cheating before they've cheated.
The method they use to determine cheating probably involves top 3 analysis of a large number of moves. This is where you have a strong engine suggest its top 3 moves, and you see how often a player matches one of those top 3. Reliable benchmarks have been made via pre-computer era world class games.
However this isn't the only method. They don't share the specifics because that knowledge would help cheaters avoid detection.
how does chess.com ensures that no one uses chess engine during online turn based game. does anybody know about it? HAil the spirit of chess!!! :). (was curious to know).