It is said that modern chess sites can indentify when someone is playing with the help of a bot or mirroring plays from a mirror match in another site, but how? What does the computer do that professional chess players can’t do?
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In the moment, the biggest tell tale sign is that the player is taking a relatively constant time between moves, regardless of the board state. Computers have no sense of any moves being more obvious than another so will take just as long analyzing a position whose next move is obvious to a human as one that requires more thinking by a human.
The end result is humans will vary how long they take to think about a move depending on the specific circumstances of the game at the moment, whereas a computer will take just about the same amount of time regardless.
As far as mirror matching, if you have a database of all games played, it’s a simple matter to see how closely your moves so far match the moves in your database of games.
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