Question: The Bear is the second of the two operas by William Walton, the libretto was based on which play of the same title, by Anton Chekhov?

full_context: Document 1: Aleksey Burago: Aleksey Burago (Director) graduated from Moscow Academy of Theatre Arts (GITIS) and studied with world famous theater director Pyotr Fomenko. His Moscow directing credits include: "Beyond Recognition." Off-Broadway, he has directed "Gamblers," "An Absolutely Happy Village", "Ah! My Dear Andersen" and "On the Eve." At HB Playwrights Foundation, he has directed "Vassa," "Picnic on the Battlefield," "The Master and Margarita," "Wonder Bread" and "Lady with the Lapdog with Jokes and a Happy Ending." His TV credits include "The Queen of Spades" (Actor/Director). His awards include 1992 Best Director - St. Petersburg Comedy Festival and 1993 Best Director - Moscow Annual Festival of Classical Plays. He has been on faculty at Theatre Academy and Conservatory in St. Petersburg, Danish Theatre School GITIS and Manhattanville College, where he taught acting and staged the short stories of Anton Chekhov. The Artistic and Founding Director of The Russian Arts Theater & Studio, Aleksey Burago is now based in New York City. He is an Associate Member of SSDC and also Director-in-Residence at Bilkent University in Ankara, Turkey.
Document 2: Fat and Thin: Fat and Thin (Russian: Толстый и тонкий ) ― is a satirical short story written by Russian writer Anton Chekhov, that was first published in 1883 in humorous magazine "Oskolki".
Document 3: The Zoo: The Zoo is a one-act comic opera, with music by Arthur Sullivan and a libretto by B. C. Stephenson, writing under the pen name of Bolton Rowe. It premiered on 5 June 1875 at the St. James's Theatre in London (as an afterpiece to W. S. Gilbert's "Tom Cobb"), concluding its run five weeks later, on 9 July 1875, at the Haymarket Theatre. There were brief revivals in late 1875, and again in 1879, before the opera was shelved.
Document 4: Anna Karenina (Carlson): Anna Karenina is an opera in two acts by American composer David Carlson, based on the novel "Anna Karenina" by Leo Tolstoy, commissioned by Florida Grand Opera to celebrate the 2007 opening of the Ziff Ballet Opera House at the Adrienne Arsht Center for the Performing Arts, co-commissioned by Opera Theatre of Saint Louis. The libretto is by British director Colin Graham, originally contemplated for Benjamin Britten's opera commissioned by the Bolshoi Theatre (the project was cancelled by the British after the Warsaw Pact invasion of Czechoslovakia). Graham was to have directed the original production; after his death only weeks before the opera's opening night, the direction was taken over by Mark Streshinsky. The opera is in two acts with a prologue and an epilogue, lasting just over two hours.
Document 5: Troilus and Cressida (opera): Troilus and Cressida is the first of the two operas by William Walton. The libretto was by Christopher Hassall, his own first opera libretto, based on Geoffrey Chaucer's poem "Troilus and Criseyde". Walton dedicated the score to his wife, Susana.
Document 6: 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.
Document 7: The Bear (play): The Bear: A Joke in One Act, or The Boor (Russian: "Медведь: Шутка в одном действии" , "Medved': Shutka v odnom deystvii" , 1888), is a one-act comedic play written by Russian author Anton Chekhov. The play was originally dedicated to Nikolai Nikolaevich Solovtsov, Chekhov's boyhood friend and director/actor who first played the character Smirnov.
Document 8: The Threepenny Opera: The Threepenny Opera (Die Dreigroschenoper ) is a "play with music" by Bertolt Brecht and Elisabeth Hauptmann, adapted from John Gay's 18th-century English ballad opera, "The Beggar's Opera", with music by Kurt Weill and insertion ballads by François Villon and Rudyard Kipling. Although Hauptmann produced 80 to 90 percent of the text, Brecht suppressed this and assumed sole credit, and is usually listed as sole author in printed versions.
Document 9: The Boor (opera): The Boor is an opera in one act composed by Ulysses Kay to a libretto based on Anton Chekhov's comic play, "The Bear" (also known as "The Boor"). Kay wrote the libretto himself basing it on an English translation of the play by the composer Vladimir Ussachevsky. The opera was commissioned by the Koussevitsky Foundation of the Library of Congress and is dedicated to the memory of Natalie and Serge Koussevitzky. It premiered on 2 April 1968 in concert version at the University of Kentucky in Lexington, Kentucky.
Document 10: 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".
Document 11: Paul Bunyan (operetta): Paul Bunyan, Op 17, is an operetta in two acts and a prologue composed by Benjamin Britten to a libretto by W. H. Auden, designed for performance by semi-professional groups. It premiered at Columbia University on 5 May 1941, to largely negative reviews, and was withdrawn by the composer. Britten revised it somewhat in 1976 and subsequently it had numerous performances and two commercial recordings. The story is based on the folkloric American lumberjack, Paul Bunyan, with the music incorporating a variety of American styles, including folk songs, blues and hymns. The work is strongly sectional in nature, highly reminiscent of the 'Broadway musical' style of the period.
Document 12: The Bear (opera): The Bear is the second of the two operas by William Walton, described in publication as an "Extravaganza in One Act". The libretto was written by Paul Dehn and Walton, based on the play of the same title by Anton Chekhov (which is also sometimes translated into English as "The Boor").
Document 13: The Turn of the Screw (opera): The Turn of the Screw is a 20th-century English chamber opera composed by Benjamin Britten with a libretto by Myfanwy Piper, "wife of the artist John Piper, who had been a friend of the composer since 1935 and had provided designs for several of the operas". The libretto is based on the novella "The Turn of the Screw" by Henry James. The opera was commissioned by the Venice Biennale and given its world premiere on 14 September 1954, at the Teatro La Fenice, Venice. The original recording was made during that year, with the composer conducting.
Document 14: 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.
Document 15: Der Bärenhäuter (opera): Der Bärenhäuter is an 1899 German-language opera by Siegfried Wagner based on the German folk tale Der Bärenhäuter, or the Bearskin man. As with most of Siegfried Wagner's operas it is more influenced by his teacher Humperdinck than his father Richard Wagner's operas.
ground_truth: The Bear: A Joke in One Act