well, in the promos they showed briefly somebody pointing at a kid playing chess against somebody saying "kid's a genius; he's checkmated a chess master in 8 moves", which is beyond ridiculous even against a coffee player.
Even Bobby Fischer(who reportedly had an "astronomical" IQ), and is considered to be one of the best if not the best player ever, developed his phenomenal skill through countless hours of practice and devotion because he was utterly obsessed with the game - upon beating almost the entire Soviet team singlehandedly at the world tournament, one of the players remarked that Bobby put more time into chess than the entire team combined.
It isn't really something where you have to be intelligent to do it like advanced math or physics and whatnot.