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Is anyone really good at telling if someone is cheating?

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You can request a computer analysis and if the Average centipawn loss is very low, then you might send a report, better to make sure first you really want to report instead of just reporting after you lost a game for example.
@Derrick1Rose some things that may indicate someone is cheating.
1. Do they take about the same time on each move? Maybe differing each time by a few seconds only.
2. Do they take a long time on obvious moves like a recapture.
3. this one is often harder to see. Do their moves seem to flow from a human or a machine? people have a very different style than computers.
What others already said is right, but I would like to add, that you can also take a look at some of the other games of the player you suspect. One game in itself is not so conclusive, but a couple of very low ACPL miracles in a row.... can't hurt to include that in your report.
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<Comment deleted by user>
@jeffforever Hogwash.

1. Average centipawn loss (ACL) is calculated from a brief analysis. A game played by Stockfish 13 NNUE at classical time controls will get several mistakes marked by Stockfish 13 brief analysis.

2. Depending on how the game evolves, the possibilities to get a lower ACL varies. ACL from a berlin endgame will look very different than ACL from a king's gambit. There are thousands of patzers who everyday from time to time play a very low ACL game.

3. Lichess should do other things than handle reports from 40 000 butthurt losers who can't tell the difference between a Volvo and a Ferrari and are in no way qualified to make any kind of judgement about someone's game.

@Derrick1Rose There are about 1000 players in the world who will be able to sometimes and I mean sometimes say if someone plays with an engine.

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