[iEchoic]

The "standard" strategy is to play GTO (game theory optimal). There are solvers out there (like GTO Wizard) that show you the "optimal" play for every situation, which is used as a baseline, and then players deviate to exploit specific player tendencies.

GTO trees are far too complex to fully memorize, so nobody can play perfect GTO. But you can do a lot of solver work to get reasonably close.

[brightball]

I won a tournament on a cruise against a guy who I think was doing this. He was one of the people at the table who had a consistent tell and that helped me beat him heads up.

[noitpmeder]

What was the tell? And separately, why do you suspect he was playing GTO?