| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 1. Gligoric vs O Neikirch |
| 1-0 | 48 |
1945 |
YUG-ch | C71 Ruy Lopez |
| 2. G Pfeiffer vs O Neikirch |
| 1-0 | 57 |
1957 |
Zonal tournament, Sofia | C84 Ruy Lopez, Closed |
| 3. Averbakh vs O Neikirch |
| 1-0 | 41 |
1958 |
Portoroz izt | C98 Ruy Lopez, Closed, Chigorin |
| 4. Gligoric vs O Neikirch |
| 1-0 | 41 |
1958 |
Portoroz izt | C67 Ruy Lopez |
| 5. Fischer vs O Neikirch |
 | ½-½ | 16 |
1958 |
Bad Portoroz izt | C67 Ruy Lopez |
| 6. A Dueckstein vs O Neikirch |
| ½-½ | 51 |
1958 |
13th olm qual. group 1 | C92 Ruy Lopez, Closed |
| 7. R Sanguineti vs O Neikirch |
| 1-0 | 32 |
1958 |
Portoroz izt | C99 Ruy Lopez, Closed, Chigorin, 12...cd |
| 8. J Kupper vs O Neikirch |
| 1-0 | 75 |
1958 |
13th olm final A | C67 Ruy Lopez |
| 9. P Dely vs O Neikirch |
| ½-½ | 19 |
1959 |
Balatonfured | C75 Ruy Lopez, Modern Steinitz Defense |
| 10. Unzicker vs O Neikirch |
| 1-0 | 41 |
1960 |
Olympiads | C75 Ruy Lopez, Modern Steinitz Defense |
| 11. Pachman vs O Neikirch |
| ½-½ | 36 |
1960 |
Madrid zt | C89 Ruy Lopez, Marshall |
| 12. Vasiukov vs O Neikirch |
| 0-1 | 36 |
1965 |
Rubinstein mem | C67 Ruy Lopez |
