For his next semi-unlikely move, Errol Morris is making six shorts for ESPN Films. This first installment, The Subterranean Stadium, delves into the world of electric football. With guidance from “commissioner” John “Larue” DiCarlo, Morris uses his typically on-point interview skills (and offscreen, typically astonished-sounded questions) to guide us through a game whose players claim, plausibly, is as complex as chess.