I don't think it's that helpful if you're letting Stockfish make a move or two for you per game, or at least at the level I'm at.
The engine is so good that it often makes moves that are incomprehensible, setting itself up for an attack in n moves where n is often 10+.
If you did want to cheat (but what's the point?) a chrome extension that prevented you from making moves where you lost more then some certain amount of centipawns would be the way to do it.
Anand talked about that a while back. He said even 1 bit of information from Stockfish per game would result in a significant amount of rating points, and be quite hard to detect. I.e. you are in a position where you could choose to play a solid move, or alternatively to launch a risky combination. Stockfish explores the combination and gives you a 1 or 0 saying whether it will work.
I believe cheat detection is done partly by humans. Computers flag something as suspicious and then they show the suspicious moves to some grandmasters who might immediately say "no human would do that", or else "yeah that move looks weird but I could imagine someone making it", that type of thing. There was a youtube of Nakamura looking at such a position a while back. The person had a chance to sac some material in order to simplify to a trivially winning endgame, but instead carried out a ridiculously complicated maneuver that kept the material. Just the sort of thing a computer would do, and Naka pointed it out.
The engine is so good that it often makes moves that are incomprehensible, setting itself up for an attack in n moves where n is often 10+.
If you did want to cheat (but what's the point?) a chrome extension that prevented you from making moves where you lost more then some certain amount of centipawns would be the way to do it.