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.
This couldn’t be further from the truth, and it’s pretty clear you don’t actually play the game. I had no idea this misconception was so common.
Chess is ALL ABOUT creativity and figuring out how to outplay your opponent and secure a win. It’s a game of strategy and tactics, of timing and technique. The way “memorization” works is that players tend to have some number of moves in their opening(s) memorized (typically 5-10, though top players can go to greater depth), at which point they are “out of book” and into the middlegame, which is where the game is actually played using some combination of positional ideas, tactics, and calculation. Many players opt to play less theoretically viable openings (that is, variations that are not quite as good with best play), because it gets their opponent out of book faster. “Novelties” (a move in a variation not previously played by a master/grandmaster in a tournament) are played all of the time, even by grandmasters.