3 ms·

this is interesting. i uploaded a game where white had only 1 legal move, and then this move was flagged as 'highly suspicious' because white made the same move

this is interesting. i uploaded a game where white had only 1 legal move, and then this move was flagged as 'highly suspicious' because white made the same move the engine would have made. i think the complexity estimation should take into account the number of legal moves.

domhudson 9d ago
Thanks for trying it! That's interesting - please can you share the analysis link here if you still have it?
- benmmurphy 7d ago
  I reran it and here it is: https://chesscheaterdetector.com/analysis/xvjsPd https://chesscheaterdetector.com/analysis/xvjsPd Move 6. kd1 after Qxf2+
  - domhudson 6d ago
    Thanks! Your diagnosis was correct - it was still calculating complexity for a move normally ignoring whether it was forced or not. Resolved :) Here's a reprocess of your game: https://chesscheaterdetector.com/analysis/7aviGW https://chesscheaterdetector.com/analysis/7aviGW Might update suspicion to always be 0 when it's forced too... It actually looks like your game did have engine-assistance right? So might need to use this as a false-negative case also.
    - benmmurphy 5d ago
      White didn't use engine assistance in this game, Black may have used engine assistance but I don't think its clear from the moves. Black's moves are theory up to some point so could have been played by someone who was booked up. However, black had very odd move timing which might indicate engine assistance or their game may have been interrupted by real life. Black spent 4 mins out of 15 mins on Qxf2+. Which I think is strange because black has very few serious candidate moves and Bxf2+ has an obvious refutation and otherwise the Black Queen needs to move because its threatened to be captured with check and g7, and c7 are hanging and the Queen can't defend both squares and losing either would be disastrous for Black. However, since White's reply is forced there is an argument that Black should spend time on Qxf2+ calculating variations beyond Kd1 rather than spending time after Kd1 just in case Qxf2+ is not good.

domhudson 9d ago

Thanks for trying it! That's interesting - please can you share the analysis link here if you still have it?

benmmurphy 7d ago
I reran it and here it is: https://chesscheaterdetector.com/analysis/xvjsPd https://chesscheaterdetector.com/analysis/xvjsPd Move 6. kd1 after Qxf2+
- domhudson 6d ago
  Thanks! Your diagnosis was correct - it was still calculating complexity for a move normally ignoring whether it was forced or not. Resolved :) Here's a reprocess of your game: https://chesscheaterdetector.com/analysis/7aviGW https://chesscheaterdetector.com/analysis/7aviGW Might update suspicion to always be 0 when it's forced too... It actually looks like your game did have engine-assistance right? So might need to use this as a false-negative case also.
  - benmmurphy 5d ago
    White didn't use engine assistance in this game, Black may have used engine assistance but I don't think its clear from the moves. Black's moves are theory up to some point so could have been played by someone who was booked up. However, black had very odd move timing which might indicate engine assistance or their game may have been interrupted by real life. Black spent 4 mins out of 15 mins on Qxf2+. Which I think is strange because black has very few serious candidate moves and Bxf2+ has an obvious refutation and otherwise the Black Queen needs to move because its threatened to be captured with check and g7, and c7 are hanging and the Queen can't defend both squares and losing either would be disastrous for Black. However, since White's reply is forced there is an argument that Black should spend time on Qxf2+ calculating variations beyond Kd1 rather than spending time after Kd1 just in case Qxf2+ is not good.