sentences:  He was a chess theoretician and professional teacher.Lipnitsky was a childhood companion and chess rival of David Bronstein in Kiev.In Bronstein's acclaimed 1995 book, coauthored with Tom Furstenberg, "The Sorcerer's Apprentice", Bronstein and Lipnitsky are pictured together in a group photo from the Kiev Junior Chess Club in 1939, and Bronstein includes an early drawn game from 1938 against Lipnitsky in his collection.