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.
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.)