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 remember a sign from The Simpsons.
Legitimate Italian Businessmen’s Club.
Also from that episode “It’s an Italian American Mexican stand-off!”