Chess is a board game that some of the kids in Elwood City play.
Brain participated in a chess tournament.
It is revealed that Lydia Fox likes chess and was ranked as one of the top players in the country.
Brain starts a chess club after he loses against Los Dedos in the junior chess championship. Rattles is revealed to be a skilled chess player who teaches Brain and the other club members how to play properly. Rattles' teachings eventually allow Brain to finally beat Los Dedos.