Career
Played for Iceland in the Chess Olympiads of 1966, 1968, 1970, 1972, 1974, 1978, 1980, 1982, 1984 and 1986. His tournament successes included 1st at Reykjavík 1970, =1st at Sant Feliu de Guíxols 1974, =2nd at Hastings 1974-1975, =1st at Ourense 1976, =2nd at Cienfuegos 1976 and =1st at Brighton 1982. In the November 2009 FIDE list, he has an Elo rating of 2463, making him Iceland"s number 10.
Laszlo Szabo vs Gudmundur Sigurjonsson, Reykjavík 1968, Semi-Slav Defense: Meran Variation (D47), 0-1
Gudmundur Sigurjonsson vs Alexandru Sorin Segal, Ybbs 1968, Budapest Defense: Adler Variation (A52), 1-0
Gudmundur Sigurjonsson vs Leif Ogaard, Esbjerg 1978, Sicilian Defense: Paulsen Variation (B46), 1-0.