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.
I recall some top player saying that he’d deliberately do a really ‘bad’ move at the start of a game and watch his opponents head explode because they’d never seen any top level player do that.