2 January] 1880, Saint Petersburg, Russia – 26 March 1932, Geneva, Switzerland) was a Russian diplomat, chess master and organizer, and musical composer.
[1] At the beginning of the 20th century, he played in several tournaments in St Petersburg, as well as in the preliminary stage of Ostend 1906 and Nuremberg 1906 (the 15th DSB Congress, Hauptturnier C).
Sossnitsky, was one of the organizers of the St Petersburg international tournament in April–May 1914 (Emanuel Lasker won, ahead of José Raúl Capablanca).
[4] After the declaration of war against Russia, eleven Russian players (Alekhine, Bogoljubow, Bogatyrchuk, Flamberg, Koppelman, Maliutin, Rabinovich, Romanovsky, Saburov, Selezniev, Vainshtein) from the Mannheim tournament were interned in Rastatt.
In September, four of them (Alekhine, Bogatyrchuk, Saburov, and Koppelman) were freed and allowed, via Switzerland, to return home.