Conversation so far:
How did Garry Kasparov rise to the top?
In January 1984, Kasparov became the No. 1 player in the world, with a FIDE rating of 2710.
When did Garry Kasparov start playing competitively
Kasparov won the Soviet Junior Championship in Tbilisi in 1976, scoring 7 points of 9, at age 13.
Did Garry Kasparov play in other matches as a teen?
He repeated the feat the following year, winning with a score of 8½ of 9.
Did Garry Kasparov continue to play in college?

Question: When did he become a professional?
Self-contained rewrite: When did Garry Kasparov become a professional?