| May 18, 2025 | Van Happen | 0–1 | Wuijts | Round 6: Van Happen, Niels - Wuijts, Johan | Zukertort Opening: Queen's Gambit Invitation | |
| May 18, 2025 | Simons | 1–0 | Van Happen | Round 5: Simons, Rudy - Van Happen, Niels | Blackmar-Diemer Gambit Accepted: Gunderam Defense | |
| May 17, 2025 | Van Happen | 0–1 | Pathak | Round 4: Van Happen, Niels - Pathak, Raghav | Scandinavian Defense: Modern Variation | |
| May 17, 2025 | Habig | ½–½ | Van Happen | Round 3: Habig, Bryan - Van Happen, Niels | English Opening: Great Snake Variation | |
| May 17, 2025 | Van Happen | ½–½ | Lenting | Round 2: Van Happen, Niels - Lenting, Roan | Sicilian Defense: Four Knights Variation | |
| May 16, 2025 | Ellenbroek | ½–½ | Van Happen | Round 1: Ellenbroek, Ton - Van Happen, Niels | Grünfeld Defense: Exchange Variation | |
| Jun 26, 2024 | Tanya-Marie 2004-2009: Cnossen | 0–1 | Van Happen | Round 5: Tanya-Marie 2004-2009: Cnossen - Van Happen, Niels | Italian Game: Classical Variation, Giuoco Pianissimo, with h6 | |
| Jun 16, 2024 | Glenn 2004-2009: Tokmakoff | 0–1 | Van Happen | Round 6: Glenn 2004-2009: Tokmakoff - Van Happen, Niels | Indian Defense: London System | |
| Jun 16, 2024 | Van Happen | 0–1 | Smeenk | Round 2: Van Happen, Niels - Smeenk, Merijn | Sicilian Defense: Kalashnikov Variation | |
| Jun 16, 2024 | Fabian 2004-2009: Leenhouwers | ½–½ | Van Happen | Round 3: Fabian 2004-2009: Leenhouwers - Van Happen, Niels | Ruy Lopez: Open Berlin Defense, l'Hermet Variation | |
| Jun 16, 2024 | Jansen | 0–1 | Van Happen | Round 1: Jansen, Ivan - Van Happen, Niels | Italian Game: Giuoco Pianissimo, Canal Variation | |
| Jun 15, 2024 | Vogel | 1–0 | Van Happen | Round 9: Vogel, Jaap - Van Happen, Niels | Indian Defense: London System | |
| Jun 15, 2024 | Van Happen | 1–0 | Aders | Round 8: Van Happen, Niels - Aders, Maarten | Italian Game: Classical Variation, Giuoco Pianissimo | |
| Jun 15, 2024 | Van Happen | 0–1 | Van Straten | Round 6: Van Happen, Niels - Van Straten, Jeroen | Modern Defense: Standard Defense | |
| Jun 15, 2024 | Pellemans | ½–½ | Van Happen | Round 5: Pellemans, Mathijs - Van Happen, Niels | Italian Game: Giuoco Piano, Greco's Attack | |
| Jun 15, 2024 | Van Happen | ½–½ | Teianu | Round 4: Van Happen, Niels - Teianu, Maxim | French Defense: Advance Variation, Euwe Variation | |
| Jun 2, 2024 | Van Happen | * | Koppenens | WLC Tournament 2024 A | ? | |
| Jun 2, 2024 | Van Happen | * | Krenning | WLC Tournament 2024 A | ? | |
| Jun 1, 2024 | Van Happen | 0–1 | Wuijts | WLC Tournament 2024 A | French Defense: Advance Variation, Euwe Variation | |
| Jun 1, 2024 | Smit | 0–1 | Van Happen | WLC Tournament 2024 A | ? | |
| Jun 1, 2024 | Hubers | 1–0 | Van Happen | WLC Tournament 2024 A | Queen's Pawn Game: Colle System, Traditional Colle | |
| May 31, 2024 | Van Happen | 0–1 | Koster | WLC Tournament 2024 A | Sicilian Defense: Lasker-Pelikan Variation, Sveshnikov Variation | |
| Mar 30, 2024 | Van Happen | 0–1 | Muskens | Round 2: Van Happen, Niels - Muskens, Mink | Sicilian Defense: Najdorf Variation, Adams Attack | |
