How do you know if someone is cheating?

Does anyone have any pointers in looking out for this? I'm in a relatively low rating, so when I face someone who gets a 98% accuracy, I am wondering if they are cheating. Especially when they blunder, I take a great lead, and all of the sudden they are making the moves to turn the game around.

Join here, post a game (without names), and someone will take a look.  Then you can report them or not.

https://www.chess.com/club/cheating-forum

Yea, but I was wondering if there's a way that I can know whether or not they are. How do you post a game without names? I'm new here.

Actually all discussion of cheating is supposed to take place over at the cheating forum and not in the general forums.  So if I give you a few hints, this thread will get shut down by moderators...

Well, I suppose if you can assist me, private messages work just fine.

I could, but I'm no expert.  Join the forum, they love this stuff over there and I'm embarrassed to admit that I've forgotten how to post a game without looking it up...

How to know if someone’s cheating? If they en passant

please disregard my post I was trolling

If you suspect someone of unfair play, report them.

https://support.chess.com/article/648-what-do-i-need-to-know-about-fair-play-on-chess-com

https://support.chess.com/article/209-how-do-i-report-someone

Also, @notmtwain, members can't join that club unless they have been a member for at least 30 days.