Alexis Paredes, I.S. 318 graduate and top-rated high school chess player, and John Galvin, the Assistant Principal at I.S. 318 and chess coordinator there, talk about the documentary “Brooklyn Castle,” which they’re both featured in. The film tells the stories of five members of the chess team at a low-income inner city junior high school that has won more national championships than any other in the country. “Brooklyn Castle” is playing at the Elinor Bunin Munroe Film Center and Sunshine Landmark Cinemas.