Does Werther or War and Peace have more acts?
War and Peace (opera) War and Peace (Op. 91) (Russian: Война и мир , "Voyna i mir") is an opera in two parts (an Epigraph and 13 scenes), sometimes arranged as five acts, by Sergei Prokofiev to a Russian libretto by the composer and Mira Mendelson, based on the novel "War and Peace" by Leo Tolstoy. Although Tolstoy's work is classified as a novel, the 1812 invasion of Russia by the French was based on real-life events, and some real-life people appear as characters in both the novel and the opera, e.g. Prince Mikhail Kutuzov and Napoleon Bonaparte.
Yaroslav Mudriy Yaroslav Mudriy (English: "Yaroslav the Wise") is an opera in eight scenes, comprised in three acts, by the Ukrainian composer Heorhiy Maiboroda, written in 1973 and premiered in 1975. The composer himself adapted the libretto from a dramatic poem by Ivan Kocherga.