The story of Panamanian boxing champ Roberto Durán has a mystery wrapped deep and tight inside its glove: Why, in the eighth round of his November 1980 rematch with Sugar Ray Leonard, whom he'd defeated in a punishing match five months earlier, did Durán suddenly turn away from his opponent, waving his powerhouse arms like useless noodles while (reportedly) saying, "No más"?
Venezuelan director Jonathan Jakubowicz's Hands of Stone, a dual portrait of Durán and his superstar trainer Ray Arcel, doesn't tell us why Durán walked away from that fight, because no one really knows. Boxing, as Arcel (played by an understated, almost pensive Robert De Niro) says in the movie, is brains over brawn, and on that night, Durán's brain, as infinitely unknowable as any other, surely called the…