Samuil Osipovich Vainshtein (Weinstein, Wainstein, Vainstein, Wajnsztejn) (1894–1942) was a Russian chess master, organizer, publisher and editor.
[1] In July/August 1914, he was playing in Mannheim at (the 19th DSB Congress, when it was interrupted by the start of World War I.
[2] After the declaration of war against Russia, eleven Russian players (Alekhine, Bogoljubow, Bogatyrchuk, Flamberg, Koppelman, Maljutin, Rabinovich, Romanovsky, Saburov, Selezniev, Weinstein) from the Mannheim tournament were interned in Germany.
In September, four of them (Alekhine, Bogatyrchuk, Saburov, and Koppelman) were freed and allowed to return home through Switzerland.
[4] After the war, he returned to Russia, and lived in Petrograd (Leningrad), where he played in several tournaments.