Veniamin Innokentevich Sozin (Russian: Вениамин Иннокентьевич Созин, 1896–1956) was a Soviet chess master, writer, and theoretician.
Sozin was a noted chess theorist and writer, contributing many articles to the Moscow magazine Shakhmatny Vestnik and writing two books.
Sozin was not the first to play this move – examples can be found dating back to the 19th century; however, he was one of the first to develop the plan of advancing the f-pawn to f5 to put pressure on Black's e6-square after the usual response 6...e6.
While this line may transpose into a classical Sozin Attack, Black has other options, for example he may choose to develop the queen's knight to d7.
In 1925, Sozin published analysis of the move 11...Nxe5 (rather than the previously played 11...axb5) in the Semi-Slav Defense, Meran Variation (ECO D49) in the Queen's Gambit Declined.