| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. F Apsenieks vs O Neikirch |
| 1-0 | 32 |
1939 |
Buenos Aires ol-8 pr B | C55 Two Knights Defense |
| 2. O Neikirch vs A Gromer |
| ½-½ | 37 |
1939 |
Buenos Aires ol-8 pr B | A25 English |
| 3. LA Gulla vs O Neikirch |
| 0-1 | 25 |
1939 |
Buenos Aires ol-8 pr B | B72 Sicilian, Dragon |
| 4. O Neikirch vs L Engels |
| ½-½ | 30 |
1939 |
Buenos Aires ol-8 pr B | B29 Sicilian, Nimzovich-Rubinstein |
| 5. O Neikirch vs P Baender |
| 0-1 | 43 |
1939 |
Buenos Aires ol-8 pr B | A35 English, Symmetrical |
| 6. O Neikirch vs Pirc |
| ½-½ | 31 |
1945 |
YUG-ch | B11 Caro-Kann, Two Knights, 3...Bg4 |
| 7. B Tot vs O Neikirch |
| 1-0 | 56 |
1945 |
YUG-ch | A03 Bird's Opening |
| 8. Gligoric vs O Neikirch |
| 1-0 | 48 |
1945 |
YUG-ch | C71 Ruy Lopez |
| 9. Gligoric vs O Neikirch |
| 0-1 | 43 |
1947 |
Balkaniad tt | D59 Queen's Gambit Declined, Tartakower |
| 10. Sajtar vs O Neikirch |
| ½-½ | 42 |
1949 |
BUL-CSR | D93 Grunfeld, with Bf4 & e3 |
| 11. O Neikirch vs Sajtar |
| ½-½ | 41 |
1949 |
BUL-CSR | A05 Reti Opening |
| 12. O Neikirch vs K Makarczyk |
| ½-½ | 41 |
1951 |
Sopot | D33 Queen's Gambit Declined, Tarrasch |
| 13. O Neikirch vs S Szabo |
| 1-0 | 30 |
1951 |
Sopot | E24 Nimzo-Indian, Samisch |
| 14. Sliwa vs O Neikirch |
| ½-½ | 49 |
1951 |
Sopot | E67 King's Indian, Fianchetto |
| 15. M Czerniak vs O Neikirch |
| 1-0 | 35 |
1954 |
Amsterdam ol (Men) | C47 Four Knights |
| 16. Sajtar vs O Neikirch |
| ½-½ | 17 |
1954 |
Amsterdam ol (Men) pre-II | D84 Grunfeld, Grunfeld Gambit Accepted |
| 17. O Neikirch vs Minev |
| 1-0 | 34 |
1954 |
BUL-ch m | E47 Nimzo-Indian, 4.e3 O-O 5.Bd3 |
| 18. O Neikirch vs F R Anderson |
| 0-1 | 80 |
1954 |
Amsterdam ol (Men) | E59 Nimzo-Indian, 4.e3, Main line |
| 19. O Neikirch vs Minev |
| ½-½ | 60 |
1954 |
BUL-ch m | D55 Queen's Gambit Declined |
| 20. O Neikirch vs J H Donner |
| ½-½ | 82 |
1954 |
Amsterdam ol (Men) | D78 Neo-Grunfeld, 6.O-O c6 |
| 21. Minev vs O Neikirch |
| 1-0 | 28 |
1954 |
BUL-ch m | D43 Queen's Gambit Declined Semi-Slav |
| 22. O Neikirch vs Pachman |
| ½-½ | 24 |
1954 |
Amsterdam ol (Men) | A46 Queen's Pawn Game |
| 23. Minev vs O Neikirch |
| 1-0 | 51 |
1954 |
BUL-ch m | A02 Bird's Opening |
| 24. B Rabar vs O Neikirch |
| 0-1 | 59 |
1954 |
Amsterdam ol (Men) | D50 Queen's Gambit Declined |
| 25. O Neikirch vs Minev |
| 1-0 | 31 |
1954 |
BUL-ch m | A97 Dutch, Ilyin-Genevsky |