Question: Who wrote the play based on two characters from Anton Chekhov's plays?

Documents:
source: Three Sisters (play)
text: Three Sisters (play) Three Sisters (Russian: Три сeстры́ , "Tri sestry " ) is a play by the Russian author and playwright Anton Chekhov. It was written in 1900 and first performed in 1901 at the Moscow Art Theatre. The play is sometimes included on the short list of Chekhov's outstanding plays, along with "The Cherry Orchard", "The Seagull" and "Uncle Vanya".

source: Afterplay (play)
text: Afterplay (play) Afterplay is a 2002 one-act play by Brian Friel. It centres on two characters from Chekhov (Sonya from "Uncle Vanya" and Andrey from "Three Sisters") meeting in Moscow in the 1920s.

source: The Seagull (1959 film)
text: The Seagull (1959 film) The Seagull is a 1959 Australian TV play based on the play by Anton Chekhov. It stars Thelma Scott and was produced by Royston Morley.

source: On the Harmful Effects of Tobacco
text: On the Harmful Effects of Tobacco On the Harmful Effects of Tobacco (Russian: О вреде табака , "O vredye tabaka " ) is a one-act play written by Russian author Anton Chekhov; it has one character, Ivan Ivanovich Nyukhin. First published in 1886, the play was revised by Chekhov and is best known from his 1902 version. This was first published in English in "The Unknown Chekhov" (1954), a collection of writings.

source: The Duel (2010 film)
text: The Duel (2010 film) Anton Chekhov's The Duel is a 2010 film directed by Dover Kosashvili. The film is an adaptation of an 1891 novella by Anton Chekhov, The Duel. Set in a seaside resort in the Caucasus, the story centers on Laevsky (Andrew Scott), an aristocratic civil servant, and his mistress Nadya (Fiona Glascott), whom Laevsky is trying to abandon. The screenplay was written by Mary Bing. "The Duel" was filmed in Croatia. The film's cast is made up of British and Irish actors. It has generally received positive reviews.

source: Tatiana Repina
text: Tatiana Repina Tatiana Repina (Russian: Татьяна Репина ) — is a one-act drama play written by Russian writer Anton Chekhov in 1889. It is a sequel of Alexey Suvorin's play "Tatiana Repina", with the same characters. Chekhov's drama was dedicated to Suvorin. Chekhov was friends with him and actively participated in the production of his "Tatyana Repina" play in Moscow.

source: Melikhovo
text: Melikhovo Melikhovo (Russian: Ме́лихово ) is a writer's house museum in the former country estate of the Russian playwright and writer Anton Chekhov. Chekhov lived in the estate from March 1892 until August 1899, and it is where he wrote some of his most famous plays and stories, including The Seagull and Uncle Vanya. The estate is located about forty miles south of Moscow near Chekhov.

source: The Proposal (1957 film)
text: The Proposal (1957 film) The Proposal is a 1957 Australian TV play based on the play "A Marriage Proposal" by Anton Chekhov.

source: The Cherry Orchard
text: The Cherry Orchard The Cherry Orchard (Russian: "Вишнëвый сад" , "Vishnevyi sad " ) is the last play by Russian playwright Anton Chekhov. Written in 1903, it was first published by "Znaniye" (Book Two, 1904), and came out as a separate edition later that year in Saint Petersburg, via A.F. Marks Publishers. It opened at the Moscow Art Theatre on 17 January 1904 in a production directed by Konstantin Stanislavski. Chekhov described the play as a comedy, with some elements of farce, though Stanislavski treated it as a tragedy. Since its first production, directors have contended with its dual nature. It is often identified as one of the three or four outstanding plays by Chekhov, along with "The Seagull", "Three Sisters", and "Uncle Vanya".

source: Birth house of Anton Chekhov
text: Birth house of Anton Chekhov The Birth house of Anton Chekhov is the place in Taganrog, Russia, where the famous writer Anton Chekhov was born. It is now a writer's house museum. The outbuilding on the territory of a property on Chekhov Street (formerly Kupecheskaya Street, later Alexandrovskaya Street, and renamed in honor of Chekhov in 1904, soon after his death) in Taganrog was built in 1859 of wattle and daub, plastered and whitened. The area taken up by the small outbuilding is 30.5 sq. meters. The house and grounds were owned by the merchant Gnutov in 1860, and by the petit bourgeois Kovalenko in 1880-1915.

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Answer: Brian Friel