Lajos Portisch vs Mark Orr
Chess Olympiad Thessaloniki GRE round 1 1988.11.13
Queen’s Gambit Declined: Exchange Variation 1-0

Nicholas Pert vs Mark Orr
Gibraltar Masters La Caleta GIB round 1 2005.01.25
Slav Defense: Alekhine Variation 1/2-1/2

Mark Orr vs Nicolas Arsenault
Gibraltar Masters La Caleta GIB round 9 2005.02.02
Amazon Attack: Siberian Attack 1/2-1/2