In the web, just go search the game history until you find your opponent who has a 'closed:fair play' flair.
Cheating against you
You can see the games you played against a closed account, though that doesn't mean all the games played had cheating.
That said, discussions about cheating, potential cheating, or cheat detection are not allowed in the general forums.
If you would like to discuss join the following club.
https://www.chess.com/club/cheating-forum
I have just been informed that someone has been caught cheating against me again ( over 20 times since I joined ). Is there anyway to know which games they were. Would be nice to see what actually happened.