Bob Draper:

>Off the top of my head Haydn wrote 12 operas Beethoven 1, Tchaikovsky 1.

Surely not.  Is this a typo?  I can name the following Tchaikovsky operas:
Yevgeny Onegin, Pique Dame, Jeanne d'Arc, Yolanta, and The Snow Maiden
(Rimsky also wrote an opera on this story).

Steve Schwartz