If you suspect someone else of using disallowed resources you should directly report them to staff.
https://support.chess.com/en/articles/8562517-how-do-i-report-someone
Publicly posting other member's accounts with accusations or asking other members if they're cheating is not allowed.
Also, discussions of cheating, potential cheating, or cheat detection are not allowed in the general forums.
Just lost to this dude and his moves were pretty sketchy. I checked his account and reviewed some of his past games. Where some he had made 0 mistakes and 93% accuracy. Which i’m pretty sure not even a grandmaster can achieve. He’s also on >7 wins in a row after losing the majority of them. If there are any “professional stockfish identifiers“ please report this dude if you can 100% guarantee he’s using stockfish. Again, user: [removed -- MS] joined on April of 2023.