| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. O Neikirch vs Vasiukov |
| ½-½ | 40 |
1957 |
Gotha | E94 King's Indian, Orthodox |
| 2. O Neikirch vs Taimanov |
| 0-1 | 50 |
1957 |
Sofia BUL-RUS | E70 King's Indian |
| 3. O Neikirch vs B Malich |
| 1-0 | 54 |
1957 |
Gotha | E85 King's Indian, Samisch, Orthodox Variation |
| 4. O Neikirch vs Panno |
| ½-½ | 41 |
1958 |
Portoroz izt | E86 King's Indian, Samisch, Orthodox, 7.Nge2 c6 |
| 5. O Neikirch vs Perez |
| ½-½ | 25 |
1958 |
13th olm final A | E92 King's Indian |
| 6. O Neikirch vs Tal |
 | ½-½ | 27 |
1958 |
Portoroz | E93 King's Indian, Petrosian System |
| 7. O Neikirch vs Benko |
| ½-½ | 22 |
1958 |
Portoroz izt | E66 King's Indian, Fianchetto, Yugoslav Panno |
| 8. O Neikirch vs R T Cardoso |
| 1-0 | 46 |
1958 |
Portoroz izt | E91 King's Indian |
| 9. O Neikirch vs G Kluger |
| 0-1 | 28 |
1959 |
Balatonfured | E92 King's Indian |
| 10. O Neikirch vs Portisch |
| ½-½ | 36 |
1960 |
Madrid | E91 King's Indian |
| 11. O Neikirch vs A Matanovic |
| 1-0 | 23 |
1960 |
Leipzig ol (Men) | E70 King's Indian |
| 12. O Neikirch vs G Kluger |
| ½-½ | 41 |
1966 |
Rubinstein mem 04th | E63 King's Indian, Fianchetto, Panno Variation |
