Aizenshtadt Isaak Naumovich(was born in 1919) - chessmaster USSR since 1961.
Candidate of chemistry science. Leningrad,"Burevestnik". Participant of many
championships of Leningrad (best result in 1950- 8p). In 1961 won the
classification match against Aronson, +4 -2=8. Referee of All-Union category.