No offense, but nobody needs an engine to beat a 800 player.
There are a couple of videos on the Internet about cheating that are absolute nonsense. Yes, you might meet a cheater on chess.com once in a while, but so what? If you suspect someone cheated, don't play them again, but don't start making a whole bunch of ridiculous accusations based on quick computer analysis. Sometimes, people find really good moves; sometimes, even weak players find really good moves. Learn from it and move on. Your chess.com rating is about as meaningful as a smiley face sticker in school anyway.
First off, unless you're hovering around the expert category, AT THE VERY LEAST, I'm sorry, but you're not that big a trophy and chances are nobody is going to bother cheating against you.
And second, these videos on cheating are ridiculous.
I got some 1100 player accusing me of cheating. He kept leaving those rude comments on my page, because the analysis of 1 game we played showed I didn't have any inaccuracies. Well, it turns out he just kept giving me piece after piece after piece. I just took them. Once it was over, there was a mate in three on the board, so I took that as well.
This idea you can gauge a cheater like that is ridiculous. They say: ''Even grandmasters make inaccurate move''.
True. Against other grandmasters.
The average amateur doesn't present them with the kind of problem they make inaccurate moves in; apples and oranges.