| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. O Birkholz vs H Weinmann |
 | 1-0 | 16 | 2011 | 82nd German Chess Championship (Women) | B27 Sicilian |
| 27. D Aden vs O Birkholz |
| 1-0 | 40 | 2011 | 82nd German Chess Championship (Women) | B22 Sicilian, Alapin |
| 28. O Birkholz vs G Strutinskaia |
| 0-1 | 37 | 2014 | World Senior Championship (Women) | A04 Reti Opening |
| 29. I Lauterbach vs O Birkholz |
| 1-0 | 88 | 2014 | World Senior Championship (Women) | B41 Sicilian, Kan |
| 30. O Birkholz vs T Sinchurina |
| 1-0 | 39 | 2014 | World Senior Championship (Women) | C11 French |
| 31. E Fatalibekova vs O Birkholz |
| 1-0 | 33 | 2014 | World Senior Championship (Women) | A04 Reti Opening |
| 32. I Kabanova vs O Birkholz |
| ½-½ | 45 | 2014 | World Senior Championship (Women) | B00 Uncommon King's Pawn Opening |
| 33. O Birkholz vs L Ungure |
 | 1-0 | 45 | 2014 | World Senior Championship (Women) | B40 Sicilian |
| 34. O Birkholz vs I Priedite |
| 1-0 | 50 | 2014 | World Senior Championship (Women) | B25 Sicilian, Closed |
| 35. S Mednikova vs O Birkholz |
| 1-0 | 77 | 2014 | World Senior Championship (Women) | B00 Uncommon King's Pawn Opening |
| 36. B Firat vs O Birkholz |
| 1-0 | 50 | 2019 | European Championship | E81 King's Indian, Samisch |
| 37. O Birkholz vs S Pogosyan |
| 0-1 | 29 | 2019 | European Championship | B30 Sicilian |
| 38. E Milikow vs O Birkholz |
| 1-0 | 67 | 2019 | European Championship | B92 Sicilian, Najdorf, Opocensky Variation |
| 39. O Birkholz vs E Risteski |
| 0-1 | 34 | 2019 | European Championship | B30 Sicilian |
| 40. Arsim Gerguri vs O Birkholz |
| ½-½ | 20 | 2019 | European Championship | B06 Robatsch |
| 41. O Birkholz vs S Caglar |
| 1-0 | 59 | 2019 | European Championship | A45 Queen's Pawn Game |
| 42. Levko Martinov vs O Birkholz |
| 0-1 | 49 | 2019 | European Championship | A05 Reti Opening |
| 43. O Birkholz vs J Heinemann |
| 0-1 | 31 | 2019 | European Championship | D01 Richter-Veresov Attack |
| 44. R Veleski vs O Birkholz |
| 1-0 | 51 | 2019 | European Championship | A00 Uncommon Opening |
| 45. O Birkholz vs K Ivanova |
| 0-1 | 54 | 2019 | European Championship | A45 Queen's Pawn Game |
Kibitzing
