George Roy Hill’s 1969 film moves with steady, stupid grace from oozy sentimentality to nihilistic violence; you have to admire the craft and assurance of the thing even as its artificiality hits you in the face. Paul Newman and Robert Redford are the romantic couple of the title; Katharine Ross is the interloper. With Strother Martin, Jeff Corey, Cloris Leachman, and Henry Jones.