Luben Popov vs Javier Alzate
Siegen Olympiad qual-6 Siegen FRG round 1 1970.09.05
King’s Indian Defense: Averbakh Variation 1/2-1/2

Luben Popov vs Aleksandar Matanovic
Budapest Zonal Budapest HUN round 3 1960.05.07
Nimzo-Indian Defense: Three Knights Variation, Duchamp Variation 1/2-1/2

Peter Clarke vs Luben Popov
Budapest Zonal Budapest HUN round 9 1960.05.16
King’s Indian Defense: Orthodox Variation, Classical System, Benko Attack 1/2-1/2