Conversation so far:
Where did the 1984 World Chess Championship take place?
The World Chess Championship 1984 was a match between Garry Kasparov and champion Anatoly Karpov in Moscow from 10 September 1984 to 15 February 1985 for the World Chess Championship.
Who were Garry Kasparov's opponents in the 1984 World Chess Championship?
The World Chess Championship 1984 was a match between Garry Kasparov and champion Anatoly Karpov in Moscow from 10 September 1984 to 15 February 1985 for the World Chess Championship.
Did Garry win the 1984 World Chess Championship?
After 5 months and 48 games, the match was abandoned in controversial circumstances with Karpov leading five wins to three, and replayed in the World Chess Championship 1985.
What was Garry Kasparov's playing style?
Kasparov was known for his extensive opening preparation and aggressive play in the opening.
What is an interesting fact about this World Championship?
The match became the first, and so far only, world championship match to be abandoned without result.

Question: Why was it controversial?
Self-contained rewrite: Why as the World Championship controversial?