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?

Question

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?

In: Other

Answer 1

They measure your play time, and they use engines to measure your “accuracy” (% of your moves that are the best possible solution).

Playing at a mechanically precise rate (despite the obviousness or the difficulty of a position) or perfect play is highly suspicious. Even Magnus Carlsen can’t play the optimal move everytime (according to engine softwares, the strongest of which should have a 96+% winrate against the best humans, according to how the elo rating works).