user12645: Is it a way to paste FEN from a game and see how many of those moves Stockfish would recommend doing? If the percentage is high, the person has most likely been using it. Is there a way of doing this? Thanks.

user12951: This is a question related to the general topic of using of a chess engine to cheat. There has been quite a lot of research on this by people like Kenneth Reagan. I have also done some research in this area and made some open source tools available that will allow you to generate statistics on move matching with engine choices. I think these would do what you are asking.

12645: <p>Is it a way to paste FEN from a game and see how many of those moves Stockfish would recommend doing? If the percentage is high, the person has most likely been using it. Is there a way of doing this? Thanks.</p>
 12951: <p>This is a question related to the general topic of using of a chess engine to cheat. There has been quite a lot of research on this by people like <a href="https://www.cse.buffalo.edu/~regan/chess/" rel="nofollow noreferrer">Kenneth Reagan</a>. I have also done some research in this area and <a href="https://www.cs.kent.ac.uk/people/staff/djb/chessplag/" rel="nofollow noreferrer">made some open source tools available</a> that will allow you to generate statistics on move matching with engine choices. I think these would do what you are asking.</p>
