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The 1986 World Chess Championship was played between Anatoly Karpov and Garry Kasparov in London and Leningrad (Saint Petersburg) from July 28 to October 8, 1986. Kasparov won. Anatoly Karpov was already assured of this rematch during his previous year's match, which was won by Garry Kasparov.
World Chess Championship 1986 Wikipedia
The match was played as the best of 24 games. If it ended 12-12, Kasparov would retain his title.