Kubrick tricked George C. Scott into playing the role of Gen. Turgidson far more ridiculously than Scott was comfortable doing. Kubrick talked Scott into doing over the top “practice” takes, which Kubrick told Scott would never be used, as a way to warm up for the “real” takes. Kubrick used these takes in the final film, causing Scott to swear never to work with Kubrick again.
During the filming, Kubrick and Scott had different opinions regarding certain scenes, but Kubrick got Scott to conform largely by repeatedly beating him at chess, which they played frequently on the set. Scott, a skilled player himself, later said that while he and Kubrick may not have always seen eye to eye, he respected Kubrick immensely for his skill at chess.