Ulf Andersson vs Petko Atanasov
EU-ch U20 final-A Groningen NED round 5 1969.01.06
English Opening: King’s English Variation, Two Knights Variation, Keres Variation 1-0

Vladimir Samuilovich Kirpichnikov vs Petko Atanasov
International Junior Tournament Riga URS 1967.??.??
Ruy Lopez: Classical Defense, Benelux Variation 1-0

Petko Atanasov vs Zoltan Ribli
Groningen Groningen 1969.??.??
Modern Defense: Pterodactyl Variation 0-1

John Moles vs Petko Atanasov
EU-ch U20 prel Groningen round 7 1969.??.??
Italian Game: Bird’s Attack 1/2-1/2