Peter Firth the film adaptation of "Equus". The film was only a moderate box-office success, but earned Firth a nomination for the Academy Award for Best Supporting Actor and a Golden Globe award in the same category. Further film work quickly followed, most notably Roman Polanski's "Tess" (1979). In May 1981, he appeared on Broadway again in Peter Shaffer's "Amadeus" as Wolfgang Amadeus Mozart, replacing Tim Curry. Shaffer had offered him the role in the original London production, but he was unavailable due to film commitments. Other film work has included roles in "Diamonds on Wheels" (1973); "When You Comin' Back, Red
Equus (play) on 11 September 1976. It then opened at the Helen Hayes Theatre on 5 October 1976, ending on 2 October 1977, for a total of 1,209 performances. Shaffer adapted the play for a 1977 film starring Richard Burton, Peter Firth, Eileen Atkins, Colin Blakely, Joan Plowright, and Jenny Agutter, directed by Sidney Lumet. Unlike stage productions, where the horses are portrayed by human actors, often muscular men wearing tribal-style masks, Lumet did not believe this could adequately be done in a film version, concluding a degree of realism was required, "because the reality he [Alan] was being watched in was