The 9th Annual Interpolis Chess Tournament held in Tilburg, Netherlands in 1985 was a Category 15 event. That year marked the shift in the event from a round robin to a double round robin. The eight participants were Jan Timman (Elo rated #3 in the world), Viktor Korchnoi (#5), Robert Hübner (#8), Ljubomir Ljubojevic (#9), Lev Polugaevsky (#13), Oleg Romanishin (#15), Roman Dzindzichashvili (#21), and the previous year's winner Anthony Miles (#30). Korchnoi played in Tilburg for the first time. Five players (Timman, Ljubojevic, Polugaevsky, Romanishin and Miles) had participated in the Interzonal tournaments earlier in the summer. The scheduled rest days were August 31, September 4, 7, 11, 14 and 16. The prize money was set at 86,500 Dutch guilders, with 20,000 guilders to the winner. Playing time was 1-6 pm. The tournament director Jan Rennings was happy with the new arrangement of only four tables and four demonstration boards, and stated that this is how it should have been all along.

It was during the third round game against Romanishin that Miles began to suffer extreme back pain. He was forced to take powerful painkillers and lie flat on a massage table during his games in order to participate in the remaining rounds (photo: http://2.bp.blogspot.com/-h9mMz7jr4...). On September 3rd, when Game 1 of the Karpov - Kasparov World Championship Match (1985) was played in Moscow, the pain was so bad that he had to postpone his Round 6 game against Polugaevsky. Later on, some of the players claimed they felt uncomfortable with their opponent lying on a table in front of them, and before Round 10, four players (Korchnoi, Hübner, Ljubojevic and Dzindzichashvili) filed an official complaint. Miles' game against Romanishin was transferred to a private room, but Romanishin refused to play there, and eventually the game was transferred back to its usual place. In Round 11, "Dzin" preferred to play the game standing in front of Miles on the table, and in Round 12, Miles and Hübner agreed to a scandalous draw. Leading the tournament by a whole point, Miles then lost to Polugaevsky in Round 13. Miles' version of what happenened is given in detail in New In Chess (November 1985) and in his book 'It's Only Me'.

Miles won his last round game, but so did Hübner and Korchnoi, and the three ended equal first with 8.5/14. They shared 47,500 guilders (about $29,643 in 2018 value) in prize money.

Tilburg, the Netherlands, 28 August - 17 September 1985

                   Age Elo   01 02 03 04 05 06 07 08
=1 Miles            30 2560  ** 0½ 11 11 10 0½ ½1 ½½  8½
=1 Hübner           36 2620  1½ ** ½½ 01 ½½ ½1 ½½ ½1  8½
=1 Korchnoi         54 2630  00 ½½ ** ½½ ½1 ½1 11 1½  8½
 4 Ljubojevic       34 2615  00 10 ½½ ** 1½ 1½ 01 01  7
=5 Polugaevsky      50 2600  01 ½½ ½0 0½ ** ½1 0½ ½½  6
=5 Romanishin       33 2590  1½ ½0 ½0 0½ ½0 ** ½½ 1½  6
=5 Timman           33 2640  ½0 ½½ 00 10 1½ ½½ ** 01  6
 8 Dzindzichashvili 41 2570  ½½ ½0 0½ 10 ½½ 0½ 10 **  5½

Raymond Keene wrote in his column in The Spectator, "Tony Miles nearly repeated his feat of last year at Tilburg, though this time he had to share top honours with Korchnoi and Hübner. I was particularly impressed by Tony's 100 per cent against Korchnoi and Ljubojevic and his generally high quantity of decisive games. This was evidence of his immense drive and fighting spirit in what is undoubtedly the strongest tournament of 1985. Tony's achievement was all the more remarkable in that he played much of the tournament stretched out on his stomach on a hospital trolley, due to a back injury."

Korchnoi and Timman next played in the Montpellier Candidates (1985) which started October 12th.

Tournament book: Willem Andriessen (ed.), 9e Interpolis schaaktoernooi 1985. Interpolis, Tilburg 1985. 64 pp.

Sources

FIDE rating list July 1985 (http://www.olimpbase.org/Elo/Elo198...)
De Stem, 10 September 1985 (https://krantenbankzeeland.nl/issue...)
Amigoe, 18 September 1985, p. 7 (https://www.delpher.nl/nl/kranten/v...)
Het Vrije Volk, 28 August 1985, p. 19 (https://www.delpher.nl/nl/kranten/v...)
The impossible challenge by Anthony Miles. In New In Chess, November 1985, pp. 6-36.
Hans Bohm in NRC Handelsblad, 28 August 1985, p. 9 (https://www.delpher.nl/nl/kranten/v...)
ANP report in Leidsch Dagblad, 16 September 1985, p. 21 (https://leiden.courant.nu/issue/LD/...)
Raymond Keene in The Spectator, 28 September 1985, p. 41 (http://archive.spectator.co.uk/arti...)
'It's Only Me' by Tony Miles (ed. Geoffrey W Lawton). Batsford, London 2003. 288 pp. (pp. 175-197)
Hebert Perez Garcia in Jaque 184 (1 Nov. 1985), pp. 596-600 (http://www.bartelski.pl/olimpbase/l...)

Original collections: Game Collection: Tilburg Interpolis 1985 by User: suenteus po 147, and Game Collection: Tilburg Interpolis 1985 by User: Tabanus. Round dates (from Dutch newspapers and New In Chess): August 28, 29, 30, September 1, 2, 3, 5, 8, 9, 10, 12, 13, 15, 17. Thanks to User: jnpope for converting guilders to USD, and to User: OhioChessFan for improving the English.