Between "The Devil and Kate" and "Martha" which has more acts?
The Devil and Kate The Devil and Kate, Op. 112, B.201, ("Čert a Káča" in Czech) is an opera in three acts by Antonín Dvořák to a Czech libretto by Adolf Wenig. It is based on a farce by Josef Kajetán Tyl, and the story also had been treated in the "Fairy Tales" of Božena Němcová. The first performance of the opera was at the National Theatre, Prague, on 23 November 1899, under Adolf Čech.
The Canterville Ghost (Knaifel opera) The Canterville Ghost (also "The Ghost of Canterville", Russian: "Кантервильское привидение" – Kantervíl’skoye privedénie, however usually spelt as "Кентервильское привидение" – Kentervíl’skoye prividénie; French: Le fantôme de Canterville, German: Das Gespenst von Canterville), an opera by the Russian composer Alexander Knaifel (Russian: Кнайфель) in three acts for 18 singers and chamber orchestra, also in an abridged version for two soloists and chamber orchestra.