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Lichess is fully open-source and thus is their cheat-detection. They use https://github.com/clarkerubber/irwin which is a statistical model (tensorflow AI). This basically detects things such as using too much time on trivial moves such as forced captures, or other out-of-character moves.
But they also use other things (see https://github.com/lichess-org/lila/blob/1ef025b9a20b95956204c16ec2096a5e91ecea44/modules/evaluation/src/main/PlayerAssessment.scala) such as browser or tab going out of focus (changing tabs, going to another program)
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Related posts
- Can we see the Lichess cheat detection stuff?
- I run a college chess society. I suspect one of our members is cheating.
- Lichess statement on Agadmator Arena Server Issues
- Vishy on stream: "Hang on guys, today was not the chess of people who just know how the pieces move."
- Is the Lichess cheat detection system a bot that looks through every game being played and looks for suspicious moves or does it work on reports?