| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. A Ornstein vs Smejkal |
| 0-1 | 37 |
1972 |
Skopje ol (Men) fin-A | D71 Neo-Grunfeld |
| 2. P Poutiainen vs A Ornstein |
| 0-1 | 41 |
1973 |
Ribe 6 Nations chT | A07 King's Indian Attack |
| 3. A Ornstein vs Larsen |
 | 0-1 | 35 |
1973 |
Ribe 6 Nations chT | C60 Ruy Lopez |
| 4. A Ornstein vs E Torre |
| 0-1 | 44 |
1974 |
Olympiad | E98 King's Indian, Orthodox, Taimanov, 9.Ne1 |
| 5. E Paoli vs A Ornstein |
| 0-1 | 49 |
1975 |
Eksjo 3th | B84 Sicilian, Scheveningen |
| 6. A Ornstein vs H Westerinen |
| 0-1 | 15 |
1975 |
Dortmund | C38 King's Gambit Accepted |
| 7. A Ornstein vs Averbakh |
| 0-1 | 24 |
1975 |
Polanica Zdroj | C92 Ruy Lopez, Closed |
| 8. A Ornstein vs Uhlmann |
| 0-1 | 37 |
1975 |
Polanica Zdroj 01 | E92 King's Indian |
| 9. J Klovans vs A Ornstein |
| 0-1 | 34 |
1975 |
Polanica Zdroj | B84 Sicilian, Scheveningen |
| 10. A Ornstein vs Savon |
| 0-1 | 26 |
1975 |
Dortmund | A15 English |
| 11. A Ornstein vs K Grigorian |
| 0-1 | 35 |
1976 |
Erevan | A15 English |
| 12. A Ornstein vs Savon |
| 0-1 | 40 |
1976 |
Yerevan | E92 King's Indian |
| 13. A Ornstein vs Plachetka |
| 0-1 | 31 |
1976 |
Decin-A | B83 Sicilian |
| 14. A Ornstein vs Jansa |
| 0-1 | 32 |
1976 |
Decin | E67 King's Indian, Fianchetto |
| 15. A Ornstein vs Sveshnikov |
| 0-1 | 27 |
1977 |
Le Harve International | D51 Queen's Gambit Declined |
| 16. A Ornstein vs Bronstein |
| 0-1 | 40 |
1977 |
Budapest | C66 Ruy Lopez |
| 17. A Ornstein vs Gipslis |
| 0-1 | 45 |
1977 |
Tallinn | A30 English, Symmetrical |
| 18. A Ornstein vs Romanishin |
| 0-1 | 40 |
1977 |
Tallinn | A28 English |
| 19. A Ornstein vs I Nei |
| 0-1 | 44 |
1977 |
Tallinn | D48 Queen's Gambit Declined Semi-Slav, Meran |
| 20. H Pohla vs A Ornstein |
| 0-1 | 53 |
1977 |
Tallinn | C02 French, Advance |
| 21. A Ornstein vs Bagirov |
| 0-1 | 48 |
1978 |
Kirovakan | D52 Queen's Gambit Declined |
| 22. A Ornstein vs Unzicker |
| 0-1 | 31 |
1978 |
23rd olm final | C09 French, Tarrasch, Open Variation, Main line |
| 23. A Ornstein vs Jansa |
| 0-1 | 36 |
1978 |
Vrnjacka Banja | E60 King's Indian Defense |
| 24. A Ornstein vs J Lechtynsky |
| 0-1 | 74 |
1981 |
Pamporovo | D61 Queen's Gambit Declined, Orthodox, Rubinstein Attack |
| 25. J Nun vs A Ornstein |
| 0-1 | 45 |
1981 |
9. Eksjo SK | A46 Queen's Pawn Game |
