Heikki Westerinen vs Gudmundur Sigurjonsson
New York New York, NY USA round 7 1977.12.??
Sicilian Defense: Najdorf Variation 1-0

Gudmundur Sigurjonsson vs Gennadi Sosonko
Hastings 1975/76 Hastings ENG round 7 1976.01.05
Sicilian Defense: Dragon Variation 1/2-1/2

Gudmundur Sigurjonsson vs Gennady Borisovich Sosonko
Geneva Geneva SUI round 10 1977.04.07
Sicilian Defense: Dragon Variation 1/2-1/2

Gudmundur Sigurjonsson vs Gunnar Gunnarsson
Reykjavik Reykjavik ISL round 13 1976.??.??
Sicilian Defense: Sozin Attack, Fischer Variation 1-0

Raymond Keene vs Gudmundur Sigurjonsson
Orense Orense ESP round 2 1976.01.20
King’s Indian Defense: Orthodox Variation 1/2-1/2

Gudmundur Sigurjonsson vs Jan Timman
Hoogovens Wijk aan Zee NED round 13 1980.01.31
Czech Defense 0-1