Khvoshchinsky's correct dates: born 1882; died 1920.  He was an
accomplished pianist and composer.  Following are his works, courtesy
of a friend of mine who is an accomplished Russian music scholar:

Op. 1 Trois Morceaux (Jurgenson c. 1900's)
Op. 2 Theme con Variazione (Johansen)
Op. 3 Etude (Johansen)
Op. 4 Six Romances for Voice & Piano (Jurgenson)
1. Flowers; 2. Forgetting the Excitement; 3. I Hear Your Voice;
4. It Can Not Be; 5. How I Treasure Wonderful Moments;
6. The Sun, the Sun has Risen

Op. 6 Deux Etudes (Jurgenson)
Op. 7 Piano Sonata No. 1 (Jurgenson)
Op. 8 Trois Morceaux (Jurgenson)
1. Mazurka; 2. Berceuse; 3. Mazurka

Op. 10 Six Morceaux (Jurgenson)
1. Moment musical; 2. Feuillet d'album; 3. Prelude;
4. Petite Valse; 5. Prelude; 6. Impromptu
Op. 13 Deux Preludes (1912 Belaieff)

Frank Himpsl