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.
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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.
# 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)
