Game |
| Result | Moves |
Year | Event/Locale | Opening |
1. A Ornstein vs P G Henry |
| ½-½ | 26 | 1969 | Niemeyer Juniors Preliminary | E44 Nimzo-Indian, Fischer Variation, 5.Ne2 |
2. A Beliavsky vs A Ornstein |
| 1-0 | 27 | 1969 | Niemeyer Juniors Preliminary | E61 King's Indian |
3. A Ornstein vs U Schulze |
| 1-0 | 36 | 1969 | Niemeyer Juniors Preliminary | E92 King's Indian |
4. A Ornstein vs G Ligterink |
| 1-0 | 31 | 1969 | Niemeyer Juniors Preliminary | E43 Nimzo-Indian, Fischer Variation |
5. R Eales vs A Ornstein |
| ½-½ | 21 | 1969 | Niemeyer Juniors Preliminary | E63 King's Indian, Fianchetto, Panno Variation |
6. A Urzica vs A Ornstein |
| 1-0 | 45 | 1969 | Niemeyer Juniors Preliminary | B30 Sicilian |
7. A Ornstein vs M Schauwecker |
| ½-½ | 41 | 1969 | Niemeyer Juniors Preliminary | E45 Nimzo-Indian, 4.e3, Bronstein (Byrne) Variation |
8. D L Henry vs A Ornstein |
| 0-1 | 41 | 1970 | EU-ch U20 Final B | E62 King's Indian, Fianchetto |
9. A Ornstein vs Westerinen |
| 0-1 | 35 | 1971 | Stockholm op | C73 Ruy Lopez, Modern Steinitz Defense |
10. S Cvetkovic vs A Ornstein |
| 1-0 | 47 | 1972 | WchT U26 19th fin-B | E42 Nimzo-Indian, 4.e3 c5, 5.Ne2 (Rubinstein) |
11. A Ornstein vs G Sigurjonsson |
| 0-1 | 67 | 1972 | WchT U26 19th fin-B | B06 Robatsch |
12. A Ornstein vs A Lombard |
 | 0-1 | 20 | 1972 | WchT U26 19th fin-B | B80 Sicilian, Scheveningen |
13. A J van Dop vs A Ornstein |
| ½-½ | 79 | 1972 | WchT U26 19th fin-B | B42 Sicilian, Kan |
14. E Raaste vs A Ornstein |
| 0-1 | 29 | 1972 | WchT U26 19th fin-B | A01 Nimzovich-Larsen Attack |
15. S Heim vs A Ornstein |
| 0-1 | 27 | 1972 | WchT U26 19th fin-B | C45 Scotch Game |
16. A Ornstein vs W Keller |
| 1-0 | 62 | 1972 | EU-ch U20 fin-C | A14 English |
17. A Ornstein vs T Stefansson |
 | 1-0 | 25 | 1972 | EU-ch U20 fin-C | E66 King's Indian, Fianchetto, Yugoslav Panno |
18. R Weemaes vs A Ornstein |
| 0-1 | 46 | 1972 | EU-ch U20 fin-C | C94 Ruy Lopez, Closed, Breyer Defense |
19. A Ornstein vs A Ipek |
| 1-0 | 27 | 1972 | EU-ch U20 fin-C | A15 English |
20. T Knight vs A Ornstein |
| 0-1 | 50 | 1972 | EU-ch U20 fin-C | A49 King's Indian, Fianchetto without c4 |
21. A Ornstein vs P Omtvedt |
| 1-0 | 44 | 1972 | EU-ch U20 fin-C | D37 Queen's Gambit Declined |
22. A Hellmayr vs A Ornstein |
| 0-1 | 40 | 1972 | EU-ch U20 fin-C | B21 Sicilian, 2.f4 and 2.d4 |
23. A Ornstein vs F Cassar |
| 1-0 | 30 | 1972 | EU-ch U20 fin-C | C72 Ruy Lopez, Modern Steinitz Defense, 5.O-O |
24. V Miranda vs A Ornstein |
| 0-1 | 37 | 1972 | EU-ch U20 fin-C | A10 English |
25. A Ornstein vs I Farago |
| ½-½ | 40 | 1972 | WchT U26 19th prel-E | C09 French, Tarrasch, Open Variation, Main line |