Weinstein was born in Brooklyn, New York and attended Erasmus Hall High School where he was two grades ahead of Bobby Fischer.
|Erasmus Hall High School|
His best tournament result was in the 1960-61 U.S. Championship when he finished third, behind Bobby Fischer and William Lombardy. This result qualified him to play in the Interzonal held in Stockholm in 1962, but he did not play. His last event was the 1963-1964 U.S. Championship where had the unusual result of 5 wins, 6 loses and no draws. He never played again. In 1963, Weinstein graduated from Brooklyn College with a degree in psychology and went to Amsterdam to attend graduate school.
In describing his play the British Chess Magazine wrote that he had the “killer instinct.” Unfortunately, the same could be said for his away from the board personality.