Jørgen Bent Larsen was a Danish chess grandmaster and author. Known for his imaginative and unorthodox style of play, he was the second-strongest non-Soviet player, behind only Bobby Fischer, for much of the 1960s and 1970s. He is considered to be the strongest player born in Denmark and the strongest from Scandinavia until the emergence of Magnus Carlsen.

Johannes Hendrikus (Hein) Donner was a Dutch chess grandmaster and writer. Donner was born in The Hague and won the Dutch Championship in 1954, 1957, and 1958. He took part in the Internacional Chess Tournament (1956), Donner came third, behind Larsen and Darga. FIDE, the World Chess Federation, awarded him the GM title in 1959. He played for the Netherlands in the Chess Olympiads 11 times. He was the uncle of the former Dutch Minister of Social Affairs and Employment, Piet Hein Donner.