How to detect cheat?

Is cheat detection in chess.com is AUTOMATIC  or only opponent's report based?

As cheaters do not  always play the best move, so during analysis their games they also have some mistakes & even blunder. So how can i suspect for whom I may make a report? 

Thanks

It's part automatic and part based on reports.

If the cheater is smart and works hard, then they'll be almost impossible to catch.

But 99% of them are dumb, so it doesn't matter. Mixing in a few blunders wont save them. Just report anyone you find suspicious... hopefully though you're smart about it. Don't report someone just because they found a tactic, or because the 5 second chess.com analysis says almost all of their moves were "best." Download a free enging (stockfish) and a free interface (like Arena or SCID, or others) and check for yourself if most of their moves were best.

Pay attention to things like how long it takes them to move, account creation date, win percentage, rating spikes (and valleys) too. If the only reason you have to report someone is the one game you lost, then you're probably wasting chess.com's time.

ditto

  Chess.com HAS witch hunters with master's degrees.......and I'm already suspicious of the OP.

With a rating below 2000 at the very least the cheaters aren't doing you much harm. Either they cheat every game, in which case they'll be out of your rating band and/or kicked off the site very quickly, or they only cheat in some games. If there are people cheating some of the time they might earn rating points from you in the games they cheat, but when you play them and they do not cheat you're effectively playing against someone with a much higher rating than their actual playing strength, so you should win back the points you lose in the other games. Basically it's not worth worrying about until you get really good.

This discussion belongs in The Cheating Forum  Club