You have been a member for a long time so you should certainly have seen that 1) chess.com doesn't reveal its methods and 2) chess.com doesn't allow discussions of cheating detection methods in the forum.
How does Chess.com know for sure when someone is really cheating?
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Oct 2, 2025
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#3
https://support.chess.com/en/articles/8568369-what-do-i-need-to-know-about-fair-play-on-chess-com
https://www.chess.com/cheating
Those should provide good information about the subject. If you would like to discuss more, join the following club.
https://www.chess.com/club/cheating-forum
I really want to know this because lately I've been drilling Chess pretty hard and have been studying a lot of theory. If my level just improves dramatically in a short time, and I'm all of a sudden playing at a 2200 ELO level or higher, what assurances can you give me that you just won't assume I'm cheating? I'm paranoid about being punished for improving.