| Oct 24, 2025 | Harmsen | 0–1 | Muzychuk | Round 6: Harmsen, Jessica - Muzychuk, Anna | Bird Opening: Dutch Variation | |
| Oct 23, 2025 | Harmsen | 0–1 | Batsiashvili | Round 5: Harmsen, Jessica - Batsiashvili, Nino | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Oct 21, 2025 | Krasteva | 1–0 | Harmsen | Round 3: Krasteva, Beloslava - Harmsen, Jessica | Zukertort Opening: Lisitsyn Gambit Deferred | |
| Oct 19, 2025 | Dzagnidze | 1–0 | Harmsen | Round 1: Dzagnidze, Nana - Harmsen, Jessica | Zukertort Opening: Dutch Variation | |
| Sep 13, 2025 | Harmsen | 1–0 | Bozanic | 1.5: Harmsen, Jessica - Bozanic, Leon | Sicilian Defense: Closed, Traditional | |
| Sep 13, 2025 | Van Arkel | 1–0 | Harmsen | 1.4: Van Arkel, Rogier - Harmsen, Jessica | French Defense: Two Knights Variation | |
| Sep 13, 2025 | Balde | 0–1 | Harmsen | 1.3: Balde, Esko - Harmsen, Jessica | Dutch Defense: Normal Variation | |
| Sep 13, 2025 | Harmsen | 0–1 | Ngangbam | 1.2: Harmsen, Jessica - Ngangbam, Chingthang | Sicilian Defense: Closed, Traditional | |
| Sep 13, 2025 | Kokkula | 0–1 | Harmsen | 1.1: Kokkula, Advaith Krishna - Harmsen, Jessica | French Defense: Advance Variation, Nimzowitsch System | |
| Jul 8, 2025 | Harmsen | ½–½ | Haast | Game 2: Harmsen, Jessica - Haast, Anne | French Defense: King's Indian Attack | |
| Jul 7, 2025 | Haast | 1–0 | Harmsen | Game 1: Haast, Anne - Harmsen, Jessica | French Defense: Advance Variation, Milner-Barry Gambit, Hector Variation | |
| Jun 23, 2025 | Westerhof | ½–½ | Harmsen | Game 2: Westerhof, Fleur - Harmsen, Jessica | French Defense: Advance Variation, Wade Variation | |
| Jun 23, 2025 | Harmsen | 1–0 | Westerhof | Game 1: Harmsen, Jessica - Westerhof, Fleur | Bird Opening: Dutch Variation | |
| Apr 29, 2024 | Androni | ½–½ | Harmsen | European Women's Chess Championship 2024 | Dutch Defense: Staunton Gambit | |
| Apr 28, 2024 | Stefan | ½–½ | Harmsen | European Women's Chess Championship 2024 | Dutch Defense | |
| Apr 27, 2024 | Harmsen | 0–1 | Karaivanova | Round 8: Harmsen, Jessica - Karaivanova, Petya | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| Apr 26, 2024 | Velikic | 1–0 | Harmsen | Round 7: Velikic, Adela - Harmsen, Jessica | Dutch Defense: Hopton Attack | |
| Apr 25, 2024 | Harmsen | 1–0 | Mashchenko | European Women's Chess Championship 2024 | Sicilian Defense: Closed | |
| Apr 23, 2024 | Sanchez Ruiz | 0–1 | Harmsen | European Women's Chess Championship 2024 | French Defense: Advance Variation, Paulsen Attack | |
| Apr 22, 2024 | Harmsen | 0–1 | Vasylchuk | European Women's Chess Championship 2024 | Bird Opening: From's Gambit, Lasker Variation | |
| Apr 21, 2024 | Dereka | ½–½ | Harmsen | European Women's Chess Championship 2024 | Dutch Defense: Semi-Leningrad Variation | |
| Apr 20, 2024 | Harmsen | ½–½ | Gajcin | European Women's Chess Championship 2024 | Sicilian Defense: Closed | |
| Apr 19, 2024 | Maltsevskaya | 1–0 | Harmsen | Round 1: Maltsevskaya, Aleksandra - Harmsen, Jessica | French Defense: Advance Variation, Wade Variation | |
