IBM international chess tournament

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The IBM international chess tournament was a series of very strong chess tournaments held in the Amsterdam, Netherlands from 1961 to 1981, and was sponsored by IBM. The list of winners of the main group includes five world champions.

Parallel there was quite often a tournament IBM-B, always with (future or former) strong grandmasters - and local Dutch players to play against foreign titleholders, apart from the major "A" section. By 1963, there were 120 participants in the IBM Amsterdam tournament, broken down to grandmaster group, master group, reserve master group, etc. It was a real festival, connected with the idea to promote (chess) programming by sponsor IBM.

Albin Planinc (left) vs. Boris Spassky in 1973
IBM 1966: Mikhail Botvinnik
IBM 1977: Tony Miles
# Year Winner
1 1961  Christian Langeweg (Netherlands)
2 1962  Moshe Czerniak (Israel)
 Hiong Liong Tan (Indonesia)
3 1963  Lajos Portisch (Hungary)
4 1964  Bent Larsen (Denmark)
5 1965  Jan Hein Donner (Netherlands)
6 1966  Mikhail Botvinnik (USSR)
7 1967  Lajos Portisch (Hungary)
8 1968  Lubomir Kavalek (Czechoslovakia)
9 1969  Lajos Portisch (Hungary)
10 1970  Boris Spassky (USSR)
 Lev Polugaevsky (USSR)
11 1971  Vasily Smyslov (USSR)
12 1972  Lev Polugaevsky (USSR)
13 1973  Tigran Petrosian (USSR)
 Albin Planinc (Yugoslavia)
14 1974  Vlastimil Jansa (Czechoslovakia)
 Vladimir Tukmakov (USSR)
 Borislav Ivkov (Yugoslavia)
15 1975  Ljubomir Ljubojević (Yugoslavia)
16 1976  Viktor Korchnoi (Switzerland)
 Tony Miles (England)
17 1977  Tony Miles (England)
18 1978  Jan Timman (Netherlands)
19 1979  Vlastimil Hort (Czechoslovakia)
 Gyula Sax (Hungary)
20 1980  Anatoly Karpov (USSR)
21 1981  Jan Timman (Netherlands)

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