But otb is more stressful.

Correct. My idea is actually that with some grace number of moves that players can play by the book (i.e. openings). After that, run the analysis I mentioned. I agree that playing OTB is more stressful and that is difficult to model in such an approach. I was hoping to at least get some signal to filter out the mostly obvious cheaters and so focus on the remainder that should be less obvious.