Ortvin Sarapu vs Glicerio Badilles
Jakarta Zonal Jakarta INA round 6 1963.09.??
Ruy Lopez: Morphy Defense, Anderssen Variation 0-1

Oscar Antze vs Otto Zander
22. DSB Kongress Bad Oeynhausen GER round 9 1922.08.??
English Opening: King’s English Variation 1-0

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

Oskar von Bahr vs Bjorn Ahlander
Swedish Championship Umea SWE round 2 2003.06.30
Sicilian Defense: Kan Variation, Gipslis Variation 0-1

Otto Marthaler vs Anton Kinzel
Reggio Emilia 1959/60 Reggio Emilia ITA round 1 1959.12.27
London System: Poisoned Pawn Variation 1/2-1/2

Pal Gracs vs Jeno Kapu
Hungarian Championship Budapest HUN round 1 1951.11.03
Sicilian Defense: Taimanov Variation, Bastrikov Variation 1-0

Parimarjan Negi vs Justin Sarkar
41st Annual World Open Arlington USA round 6.7 2013.07.06
Sicilian Defense: Najdorf Variation 1-0

Parimarjan Negi vs Manuel Bosboom
Corus Group C Wijk aan Zee NED round 5 2005.01.20
Philidor Defense 1/2-1/2

Parimarjan Negi vs Sundar M Shyam
14th Dubai Open Dubai UAE round 5.7 2012.04.19
Ruy Lopez: Berlin Defense, Berlin Wall 1-0

Parimarjan Negi vs Yuniesky Quesada Perez
Chess Olympiad Istanbul TUR round 10.9 2012.09.07
Sicilian Defense: Taimanov Variation, Bastrikov Variation 1-0