Jorge Bolet plays Schlözer's Etude Opus 1 No. 2

Paul de Schlözer or Paweł Schlözer (1841 or 1842-1898) was an enigmatic composer who is only known to have written two pieces: 2 Études de сoncert for piano, Opus 1. Some people say these two virtuosic Études were actually written by Moritz Moszkowski (1854-1925) -- apparently, he lost the manuscript to de Schlözer in a card game. However, others don't believe this story and say that the writing and style of these pieces is quite different from other Études of Moszkowski (more elaborate and technically more challenging, with more daring modulations). 

Here's a recording of Jorge Bolet (1914-1990) playing the second one in A flat major. Recorded in 1985.
On the second photograph Paul's niece Tatiana Fyodorovna Schlözer (1883-1992) who became Alexander Scriabin's second wife.