Unfair play?

I got a message saying that one of my opponents had been detected violating fair play policy......can anybody tell me what that means?

It's all a big act to make it seem like the cheat team actually does something I played over 300 games in this account over half of them easily have been engines and haven't had one point adjusted but about the garbage just all show

It means they have been using an engine and cheating so you gain back the rating points that you lost in that game. 

thanks - how would chess.com know that this was going on?

You’ve only played bullet. It‘s nearly impossible to cheat in bullet. I doubt none of your opponents cheated, so relax.

Accuracy does not determine whether someone cheats. I have gotten above 98%. I’m not a cheater. CAPS score means nothing.

Chess.com scans games for engine use.

It's not the accuracy you get in the game reports. Anyone rated more than 1800 or so is going to regularly be up in the 90's on that. They actually have a bunch of systems that run behind the scenes to identify cheaters automatically (or if someone reported the person). When they find one and ban them, then they go back and try to return rating points to people who got beat unfairly.

It's saying that someone that played and beat you was cheating and they just refund the points you lost to them. Happened to me the day before.

A lot of people have had perfect games, but try to play hundreds of games without getting anything below 90%

Yes, but that doesn’t change the fact that CAPS score isn’t used to determine  whether someone is cheating.