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Which play did Peter Shaffer adapt for Sidney Lumet’s film Equus?

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Sidney Lumet in a tuxedo holds his Honorary Academy Award and smiles backstage at the 77th Annual Academy Awards, with a gold Oscar statue in the background. — Sidney Lumet American director Sidney Lumet after receiving an Academy Award for lifetime achievement, 2005.

Peter Shaffer adapted his own Broadway play, Equus, for the 1977 film directed by Sidney Lumet.1