| Game |
| Result | Moves |
Year |
Event/Locale | Opening |
| 26. O Neikirch vs F R Anderson |
| 0-1 | 80 |
1954 |
Amsterdam ol (Men) | E59 Nimzo-Indian, 4.e3, Main line |
| 27. Filip vs O Neikirch |
| ½-½ | 25 |
1957 |
Gotha | E14 Queen's Indian |
| 28. O Neikirch vs A Niemela |
| 1-0 | 38 |
1957 |
Zonal tournament, Sofia | D35 Queen's Gambit Declined |
| 29. Taimanov vs O Neikirch |
| ½-½ | 23 |
1957 |
Sofia BUL-RUS | E94 King's Indian, Orthodox |
| 30. Filip vs O Neikirch |
| ½-½ | 16 |
1957 |
Zonal tournament, Sofia | A30 English, Symmetrical |
| 31. G Barcza vs O Neikirch |
| 0-1 | 41 |
1957 |
Zonal tournament, Sofia | A24 English, Bremen System with ...g6 |
| 32. S Basjuni vs O Neikirch |
| 0-1 | 41 |
1957 |
Zonal tournament, Sofia | A09 Reti Opening |
| 33. O Neikirch vs Taimanov |
| 0-1 | 50 |
1957 |
Sofia BUL-RUS | E70 King's Indian |
| 34. O Neikirch vs Sliwa |
| 1-0 | 32 |
1957 |
Zonal tournament, Sofia | D41 Queen's Gambit Declined, Semi-Tarrasch |
| 35. O Neikirch vs A Beni |
| ½-½ | 57 |
1957 |
Zonal tournament, Sofia | A44 Old Benoni Defense |
| 36. O Neikirch vs Sliwa |
| ½-½ | 86 |
1957 |
Gotha | C75 Ruy Lopez, Modern Steinitz Defense |
| 37. O Neikirch vs R Fuchs |
| ½-½ | 54 |
1957 |
Zonal tournament, Sofia | D41 Queen's Gambit Declined, Semi-Tarrasch |
| 38. O Neikirch vs Rellstab |
| 1-0 | 27 |
1957 |
Gotha | A16 English |
| 39. G Pfeiffer vs O Neikirch |
| 1-0 | 57 |
1957 |
Zonal tournament, Sofia | C84 Ruy Lopez, Closed |
| 40. F Zita vs O Neikirch |
| ½-½ | 18 |
1957 |
Zonal tournament, Sofia | E62 King's Indian, Fianchetto |
| 41. Sliwa vs O Neikirch |
| 0-1 | 58 |
1957 |
Sofia zt playoff | E46 Nimzo-Indian |
| 42. O Neikirch vs Vasiukov |
| ½-½ | 40 |
1957 |
Gotha | E94 King's Indian, Orthodox |
| 43. G Mititelu vs O Neikirch |
| ½-½ | 23 |
1957 |
Zonal tournament, Sofia | E49 Nimzo-Indian, 4.e3, Botvinnik System |
| 44. O Neikirch vs A Matanovic |
| ½-½ | 43 |
1957 |
Zonal tournament, Sofia | E30 Nimzo-Indian, Leningrad |
| 45. O Neikirch vs Karaklajic |
| ½-½ | 19 |
1957 |
Zonal tournament, Sofia | E59 Nimzo-Indian, 4.e3, Main line |
| 46. O Neikirch vs B Malich |
| 1-0 | 54 |
1957 |
Gotha | E85 King's Indian, Samisch, Orthodox Variation |
| 47. O Neikirch vs G Szilagyi |
| 1-0 | 27 |
1957 |
Zonal tournament, Sofia | B39 Sicilian, Accelerated Fianchetto, Breyer Variation |
| 48. O Neikirch vs C H Alexander |
| ½-½ | 20 |
1958 |
13th olm final A | B06 Robatsch |
| 49. O Neikirch vs Bronstein |
| ½-½ | 20 |
1958 |
Izt | A37 English, Symmetrical |
| 50. O Neikirch vs J Sherwin |
| ½-½ | 24 |
1958 |
Portoroz izt | A22 English |