Weinstein attended Erasmus Hall High School, where he was two grades ahead of Bobby Fischer.
Weinstein played first board on the Brooklyn College chess team which became national collegiate champions.
Weinstein played on the U.S. team in the 1960 world Chess Olympiad in Leipzig, East Germany.
Weinstein defeated many top American players, including Samuel Reshevsky and Pal Benko.
Weinstein defeated Lombardy, Reshevsky, Bisguier and Robert Byrne in this tournament.