Conversation so far:
who won the 1984 world championship?
The match became the first, and so far only, world championship match to be abandoned without result.
why was it abandoned?
Campomanes cited the health of the players, which had been strained by the length of the match.
how long was the match?
Kasparov won games 47 and 48 to bring the scores to 5-3 in Karpov's favour.
Then the match was ended without result.
anything else interesting?
The World Chess Championship 1984 match between Anatoly Karpov and Garry Kasparov had many ups and downs.
what kind of ups and downs?
Karpov started in very good form, and after nine games Kasparov was down 4-0 in a "first to six wins" match.

Question: how did he come back?
Self-contained rewrite: How did Garry Kasparov come back?