Vladimir Kovacevic vs Petar Velikov
Chess Olympiad Lucerne SUI round 3 1982.11.01
London System: Poisoned Pawn Variation 1-0

Petar Velikov vs Gyula Sax
EU-ch U20 qual Groningen NED round 3 1971.12.22
Sicilian Defense: Najdorf Variation, Amsterdam Variation 0-1