| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 1. N Ornithopoulos vs N Spiridonov |
 | 0-1 | 36 | 1964 | Tel Aviv Olympiad qual-7 | A15 English |
| 2. F Guerrero vs N Ornithopoulos |
| 1-0 | 46 | 1964 | Tel Aviv Olympiad Final-C | D60 Queen's Gambit Declined, Orthodox Defense |
| 3. Y Safvat vs N Ornithopoulos |
| 0-1 | 58 | 1964 | Tel Aviv Olympiad Final-C | B56 Sicilian |
| 4. D De Loughrey vs N Ornithopoulos |
| ½-½ | 30 | 1964 | Tel Aviv Olympiad Final-C | B51 Sicilian, Canal-Sokolsky (Rossolimo) Attack |
| 5. S Zinser vs N Ornithopoulos |
| 0-1 | 56 | 1964 | Tel Aviv Olympiad Final-C | D68 Queen's Gambit Declined, Orthodox Defense, Classical |
| 6. N Ornithopoulos vs Westerinen |
| 0-1 | 45 | 1966 | Havana Olympiad qual-7 | A45 Queen's Pawn Game |
| 7. N Padevsky vs N Ornithopoulos |
| ½-½ | 48 | 1966 | Havana Olympiad qual-7 | B09 Pirc, Austrian Attack |
| 8. N Bouaziz vs N Ornithopoulos |
| 0-1 | 38 | 1966 | Havana Olympiad Final-C | A56 Benoni Defense |
| 9. L Roux Cabral vs N Ornithopoulos |
| 0-1 | 28 | 1966 | Havana Olympiad Final-C | A41 Queen's Pawn Game (with ...d6) |
| 10. Letelier vs N Ornithopoulos |
| 1-0 | 40 | 1966 | Havana Olympiad Final-C | A56 Benoni Defense |
| 11. R Cassidy vs N Ornithopoulos |
| 1-0 | 88 | 1966 | Havana Olympiad Final-C | E73 King's Indian |
| 12. Fischer vs N Ornithopoulos |
| 1-0 | 48 | 1968 | Clock simul, 5b | B45 Sicilian, Taimanov |
| 13. H Liebert vs N Ornithopoulos |
| 1-0 | 38 | 1968 | Lugano Olympiad qual-6 | A21 English |
| 14. G Philippe vs N Ornithopoulos |
| 0-1 | 9 | 1968 | Lugano Olympiad Final-C | A23 English, Bremen System, Keres Variation |
| 15. N Ornithopoulos vs G Cappello |
| 0-1 | 49 | 1968 | Lugano Olympiad Final-C | A10 English |
| 16. G Budowski vs N Ornithopoulos |
| 1-0 | 27 | 1968 | Lugano Olympiad Final-C | B21 Sicilian, 2.f4 and 2.d4 |
| 17. K O'Riordan vs N Ornithopoulos |
| ½-½ | 20 | 1968 | Lugano Olympiad Final-C | A56 Benoni Defense |
| 18. N Ornithopoulos vs V Arapovic |
| 1-0 | 44 | 1977 | Kallithea-B 3rd | A10 English |
| 19. E Kaloussis vs N Ornithopoulos |
| 1-0 | 39 | 1985 | Nikea Open | A46 Queen's Pawn Game |
| 20. T Lirindzakis vs N Ornithopoulos |
| 1-0 | 73 | 1985 | Nikea Open | B91 Sicilian, Najdorf, Zagreb (Fianchetto) Variation |
| 21. N Ornithopoulos vs D Alexakis |
| 0-1 | 40 | 1985 | Nikea Open | A00 Uncommon Opening |
| 22. N Ornithopoulos vs E M Fucak |
| 0-1 | 58 | 1985 | Nikea Open | A19 English, Mikenas-Carls, Sicilian Variation |
| 23. N Ornithopoulos vs S Psaras |
| 0-1 | 43 | 1985 | Nikea Open | A01 Nimzovich-Larsen Attack |
| 24. N Ornithopoulos vs N Sideris |
| ½-½ | 46 | 1985 | Nikea Open | A01 Nimzovich-Larsen Attack |
| 25. H Pountzas vs N Ornithopoulos |
| 1-0 | 27 | 1985 | Nikea Open | A09 Reti Opening |
Kibitzing
