Andre Lombard vs Oscar Humberto Castro Rojas
Biel Interzonal Biel SUI round 1 1976.07.11
Grünfeld Defense: Exchange Variation, Seville Variation 0-1

Oscar Humberto Castro Rojas vs Efim Geller
Biel Interzonal Biel SUI round 7 1976.07.20
Sicilian Defense: Nyezhmetdinov-Rossolimo Attack, Fianchetto Variation 1-0

Oscar Humberto Castro Rojas vs Borislav Ivkov
Sao Paulo Sao Paulo BRA round 5 1978.05.??
Vienna Game: Heyde Variation 1-0