I am watching the Speed Chess Championship on Twitch as we speak and the commentators along with interviews with GMs and the players themselves are nonstop talking about bluffing and anticipation.

Magnus for example talks about the importance of purposely making a sub-optimal move as a way to bluff your opponent. Your opponent likely has memorized all the optimal moves and so you make a sub-optimal move to leave your opponent guessing whether you made a genuine mistake that you can be punished for, or whether you made that sub-optimal move on purpose because you studied it extensively whereas your opponent has not and you know if your opponent doesn't play it absolutely perfectly you can trap them.

I mean seriously you can watch the championship for free on Twitch right now with GM Naroditsky and GM Rozman, and they don't really talk that much about what the theoretical best moves are, they talk about the psychology, about players going on tilt, about making aggressive moves to throw your opponent off. It's fun and fascinating.