| Game |
| Result | Moves |
Year | Event/Locale | Opening |
| 26. M Molenda vs F Sieber |
| 1-0 | 65 | 2017 | MetLife Warsaw Najdorf Chess Festival | D73 Neo-Grunfeld, 5.Nf3 |
| 27. F Sieber vs K Bus |
| ½-½ | 34 | 2017 | MetLife Warsaw Najdorf Chess Festival | C67 Ruy Lopez |
| 28. A Deszczynski vs F Sieber |
| 0-1 | 32 | 2017 | MetLife Warsaw Najdorf Chess Festival | B67 Sicilian, Richter-Rauzer Attack, 7...a6 Defense, 8...Bd7 |
| 29. F Sieber vs A Das |
| 0-1 | 38 | 2017 | MetLife Warsaw Najdorf Chess Festival | B42 Sicilian, Kan |
| 30. P Nguyen vs F Sieber |
| 1-0 | 34 | 2017 | MetLife Warsaw Najdorf Chess Festival | A14 English |
| 31. F Sieber vs A Mittal |
| ½-½ | 37 | 2017 | MetLife Warsaw Najdorf Chess Festival | B90 Sicilian, Najdorf |
| 32. J Adamski vs F Sieber |
| ½-½ | 28 | 2017 | MetLife Warsaw Najdorf Chess Festival | A13 English |
| 33. A Pourkashiyan vs F Sieber |
| ½-½ | 56 | 2017 | Erfurt Young Masters | C77 Ruy Lopez |
| 34. F Sieber vs G Mammadova |
| 0-1 | 55 | 2017 | AZE-GER Women | C11 French |
| 35. B S Ayan vs F Sieber |
| ½-½ | 41 | 2018 | World Junior Championship (Girls) | E46 Nimzo-Indian |
| 36. F Sieber vs M Kyrkjebo |
| 1-0 | 49 | 2018 | World Junior Championship (Girls) | C78 Ruy Lopez |
| 37. I Furtado vs F Sieber |
| 1-0 | 61 | 2018 | World Junior Championship (Girls) | A22 English |
| 38. F Sieber vs Eylul Celik |
| 1-0 | 52 | 2018 | World Junior Championship (Girls) | B40 Sicilian |
| 39. A Santeramo vs F Sieber |
| 0-1 | 56 | 2018 | World Junior Championship (Girls) | A45 Queen's Pawn Game |
| 40. F Sieber vs S Ghukasyan |
| ½-½ | 61 | 2018 | World Junior Championship (Girls) | C95 Ruy Lopez, Closed, Breyer |
| 41. M Potapova vs F Sieber |
| 1-0 | 42 | 2018 | World Junior Championship (Girls) | C55 Two Knights Defense |
| 42. F Sieber vs S Sankova |
| ½-½ | 50 | 2018 | World Junior Championship (Girls) | B90 Sicilian, Najdorf |
| 43. K Dwilewicz vs F Sieber |
| 0-1 | 44 | 2018 | World Junior Championship (Girls) | B81 Sicilian, Scheveningen, Keres Attack |
| 44. F Sieber vs X Bai |
| 0-1 | 65 | 2018 | World Junior Championship (Girls) | C92 Ruy Lopez, Closed |
| 45. Y Li vs F Sieber |
| 0-1 | 43 | 2018 | World Junior Championship (Girls) | E00 Queen's Pawn Game |
| 46. F Sieber vs A Zatonskih |
| 0-1 | 117 | 2018 | Frauenbundesliga -19 | C16 French, Winawer |
| 47. F Sieber vs E Atalik |
| 0-1 | 50 | 2019 | Frauenbundesliga 2018-19 | C92 Ruy Lopez, Closed |
| 48. F Sieber vs C Anacoglu |
| 0-1 | 32 | 2019 | European Championship (Women) | C89 Ruy Lopez, Marshall |
| 49. C De Seroux vs F Sieber |
| ½-½ | 65 | 2019 | European Championship (Women) | B53 Sicilian |
| 50. F Sieber vs A Berke |
| 0-1 | 63 | 2019 | European Championship (Women) | B47 Sicilian, Taimanov (Bastrikov) Variation |
Kibitzing
