The exact methodology is proprietary, but part of it involves comparing your moves with those suggested by computer analysis and applying sophisticated statistical analysis.
The accuracy score displayed when running a game through the chess.com analyzer is not used for cheat detection, and a high accuracy score does not necessarily mean that someone is cheating. High accuracy scores are especially common in games with an early blunder from the opponent and in long endgames.
The exact methodology is proprietary, but part of it involves comparing your moves with those suggested by computer analysis and applying sophisticated statistical analysis.
The accuracy score displayed when running a game through the chess.com analyzer is not used for cheat detection, and a high accuracy score does not necessarily mean that someone is cheating. High accuracy scores are especially common in games with an early blunder from the opponent and in long endgames.