Sure, playing chess needs intelligence, dedication, and good chess players are smarter than an average person. But it’s waaaay exaggerated in movies. I’m a math researcher, and in any movie, my department will be full of chess geniuses. But in reality, only about 10% of them even play chess.
Chess requires dedication, conviction, and patience. Anyone with average intelligence can learn the game to the point of competence in 30 minutes.
It requires much more time to become an expert, or master.
And most people don’t have that much time to expend on it. That’s not something to be ashamed of.
You also need a sharp memory. I’m good in math, but terrible in remembering things. I forget terms that I’m actively doing research on, and constantly need to look at notes. (Aside: I work on modular forms, and often write them down as MF in my notes. I have more than once read that aloud as motherfucker, once in front of my advisor. Dude is chill, so it’s fine. But I dread the day it happens during a talk lol.)