The World Chess Championship 1984–1985 was a match between challenger Garry Kasparov and defending champion Anatoly Karpov in Moscow from 10 September 1984 to 15 February 1985 for the World Chess Championship title. After 5 months and 48 games, the match was abandoned in controversial circumstances with Karpov leading 5 wins to 3 (with 40 draws), and replayed in the World Chess Championship 1985.
1982 Interzonals
Three Interzonal tournaments were held. The top two finishers in each qualified. Zoltán Ribli won the Las Palmas Interzonal ahead of 61-year-old former World Champion Vasily Smyslov. Kasparov, aged 19 years old at the time, won the Moscow Interzonal by a convincing 1½ point margin ahead of Alexander Beliavsky. The Toluca Interzonal was won jointly by Lajos Portisch and Eugenio Torre.
{ | class="wikitable" |+ July 1982 Interzonal, Las Palmas |- ! !! !! Rating !! 1 !! 2 !! 3 !! 4 !! 5 !! 6 !! 7 !! 8 !! 9 !! 10 !! 11 !! 12 !! 13 !! 14 !! Total !! Tie break |- style="background:#cfc;" | 1 || align=left| || 2580 || – || 1 || ½ || 1 || ½ || ½ || 1 || ½ || ½ || ½ || ½ || 1 || 1 || ½ || 9 || |- style="background:#cfc;" | 2 || align=left| || 2565 || 0 || – || 1 || 0 || ½ || ½ || ½ || ½ || 1 || 1 || 1 || ½ || 1 || 1 || 8½ || |- | 3 || align=left| || 2525 || ½ || 0 || – || 0 || ½ || 1 || 1 || 1 || ½ || 1 || 1 || ½ || 1 || 0 || 8 || |- | 4 || align=left| || 2555 || 0 || 1 || 1 || – || 1 || ½ || ½ || 0 || 1 || ½ || 0 || ½ || ½ || 1 || 7½ || 48.00 |- | 5 || align=left| || 2605 || ½ || ½ || ½ || 0 || – || 1 || ½ || ½ || ½ || 1 || ½ || 1 || ½ || ½ || 7½ || 47.00 |- | 6 || align=left| || 2600 || ½ || ½ || 0 || ½ || 0 || – || ½ || 1 || 1 || ½ || 0 || ½ || ½ || 1 || 6½ || 39.25 |- | 7 || align=left| || 2595 || 0 || ½ || 0 || ½ || ½ || ½ || – || 0 || 0 || ½ || 1 || 1 || 1 || 1 || 6½ || 37.50 |- | 8 || align=left| || 2550 || ½ || ½ || 0 || 1 || ½ || 0 || 1 || – || 0 || ½ || ½ || ½ || ½ || ½ || 6 || 39.25 |- | 9 || align=left| || 2540 || ½ || 0 || ½ || 0 || ½ || 0 || 1 || 1 || – || 0 || 1 || ½ || 0 || 1 || 6 || 36.00 |- | 10 || align=left| || 2615 || ½ || 0 || 0 || ½ || 0 || ½ || ½ || ½ || 1 || – || ½ || ½ || ½ || 1 || 6 || 35.00 |- | 11 || align=left| || 2505 || ½ || 0 || 0 || 1 || ½ || 1 || 0 || ½ || 0 || ½ || – || ½ || ½ || ½ || 5½ || 35.25 |- | 12 || align=left| || 2360 || 0 || ½ || ½ || ½ || 0 || ½ || 0 || ½ || ½ || ½ || ½ || – || ½ || 1 || 5½ || 32.75 |- | 13 || align=left| || 2500 || 0 || 0 || 0 || ½ || ½ || ½ || 0 || ½ || 1 || ½ || ½ || ½ || – || 1 || 5½ || 31.25 |- | 14 || align=left| || 2590 || ½ || 0 || 1 || 0 || ½ || 0 || 0 || ½ || 0 || 0 || ½ || 0 || 0 || – || 3 || |}
{ | class="wikitable" |+ September 1982 Interzonal, Moscow |- ! !! !! Rating !! 1 !! 2 !! 3 !! 4 !! 5 !! 6 !! 7 !! 8 !! 9 !! 10 !! 11 !! 12 !! 13 !! 14 !! Total !! Tie break |- style="background:#cfc;" | 1 || align=left| || 2675 || – || ½ || ½ || ½ || ½ || ½ || 1 || 1 || 1 || 1 || 1 || 1 || 1 || ½ || 10 || |- style="background:#cfc;" | 2 || align=left| || 2620 || ½ || – || 1 || ½ || 1 || 1 || 0 || 0 || 1 || 1 || 0 || 1 || ½ || 1 || 8½ || |- | 3 || align=left| || 2610 || ½ || 0 || – || ½ || ½ || ½ || 1 || ½ || ½ || 1 || 1 || ½ || 1 || ½ || 8 || 48.00 |- | 4 || align=left| || 2610 || ½ || ½ || ½ || – || 0 || ½ || 1 || ½ || ½ || ½ || 1 || 1 || ½ || 1 || 8 || 47.50 |- | 5 || align=left| || 2565 || ½ || 0 || ½ || 1 || – || ½ || ½ || 0 || 1 || 1 || ½ || ½ || 1 || ½ || 7½ || 46.50 |- | 6 || align=left| || 2500 || ½ || 0 || ½ || ½ || ½ || – || 1 || 1 || 0 || 1 || 1 || ½ || 0 || 1 || 7½ || 45.25 |- | 7 || align=left| || 2500 || 0 || 1 || 0 || 0 || ½ || 0 || – || 1 || ½ || ½ || ½ || ½ || 1 || 1 || 6½ || |- | 8 || align=left| || 2560 || 0 || 1 || ½ || ½ || 1 || 0 || 0 || – || ½ || ½ || 0 || ½ || ½ || 1 || 6 || 37.50 |- | 9 || align=left| || 2505 || 0 || 0 || ½ || ½ || 0 || 1 || ½ || ½ || – || 0 || ½ || ½ || 1 || 1 || 6 || 34.25 |- | 10 || align=left| || 2495 || 0 || 0 || 0 || ½ || 0 || 0 || ½ || ½ || 1 || – || ½ || 1 || 1 || ½ || 5½ || |- | 11 || align=left| || 2520 || 0 || 1 || 0 || 0 || ½ || 0 || ½ || 1 || ½ || ½ || – || ½ || 0 || ½ || 5 || 31.25 |- | 12 || align=left| || 2535 || 0 || 0 || ½ || 0 || ½ || ½ || ½ || ½ || ½ || 0 || ½ || – || 1 || ½ || 5 || 29.25 |- | 13 || align=left| || 2415 || 0 || ½ || 0 || ½ || 0 || 1 || 0 || ½ || 0 || 0 || 1 || 0 || – || 1 || 4½ || |- | 14 || align=left| || 2520 || ½ || 0 || ½ || 0 || ½ || 0 || 0 || 0 || 0 || ½ || ½ || ½ || 0 || – || 3 || |}
Tal and Andersson contested a playoff in Malmö for a reserve spot for the Candidates Tournament. The match ended 3–3; Tal became first reserve because of his better tie break score in the main event, but eventually no reserves were needed.