| — | Grooten | ½–½ | Bagrationi | Grenke Open | Semi-Slav Defense | |
| — | Grooten | 0–1 | Beikert | new tournament description | Dutch Defense: Semi-Leningrad Variation | |
| Jun 21, 2026 | Kooijmans | 0–1 | Grooten | HSG Open 2026 A | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Jun 21, 2026 | Smeets | 0–1 | Grooten | HSG Open 2026 A | Caro-Kann Defense: Advance Variation, Tal Variation | |
| Jun 20, 2026 | Grooten | 0–1 | Albers | HSG Open 2026 A | Queen's Gambit Declined: Tartakower Defense | |
| Jun 19, 2026 | Grooten | 0–1 | Grooten | HSG Open 2026 A | Zukertort Opening | |
| Jun 19, 2026 | Grooten | 1–0 | Coenen | HSG Open 2026 A | Robatsch Defense | |
| May 17, 2026 | Grooten | 0–1 | Van Meegen | Round 5: Grooten, Herman - Van Meegen, Ruud | King's Indian Attack: Yugoslav Variation | |
| May 16, 2026 | Ondersteijn | ½–½ | Grooten | Round 4: Ondersteijn, Niels - Grooten, Herman | English Opening: King's English Variation, Botvinnik System | |
| May 10, 2026 | Becx | 0–1 | Grooten | Ronde 6: Becx, Cesar - Grooten, Herman | Bird Opening: Dutch Variation | |
| May 10, 2026 | Haitjema | 1–0 | Grooten | Ronde 5: Haitjema, Jarich - Grooten, Herman | Sicilian Defense: Delayed Alapin Variation | |
| May 9, 2026 | Herman Grooten | 0–1 | Noah Ritzerveld | Ronde 3: Herman Grooten - Noah Ritzerveld | English Opening: Symmetrical Variation, Rubinstein Variation | |
| May 9, 2026 | Sascha Kurt | 0–1 | Herman Grooten | Ronde 2: Sascha Kurt - Herman Grooten | Sicilian Defense: Najdorf Variation, Adams Attack | |
| May 8, 2026 | Herman Grooten | 1–0 | Issaad | Round 1: Herman Grooten - Issaad, Pascal | Dutch Defense: Leningrad Variation, Warsaw Variation | |
| May 2, 2026 | Grooten | 1–0 | Bondarchuk | Round 9: Grooten, Herman - Bondarchuk, Vadim | Benko Gambit Accepted: Pawn Return Variation | |
| May 2, 2026 | Van Baaren | 0–1 | Grooten | Round 8: Van Baaren, Joris - Grooten, Herman | Sicilian Defense: Delayed Alapin Variation | |
| May 2, 2026 | Grooten | 1–0 | Smailji | Round 7: Grooten, Herman - Smailji, Sadik | English Defense | |
| May 2, 2026 | Koppenens | 1–0 | Grooten | Round 6: Koppenens, Oscar - Grooten, Herman | Sicilian Defense: Najdorf Variation, English Attack | |
| May 2, 2026 | Grooten | 0–1 | Thijssen | Round 5: Grooten, Herman - Thijssen, Freek | Semi-Slav Defense | |
| May 2, 2026 | Leenhouts | 1–0 | Grooten | Round 4: Leenhouts, Koen - Grooten, Herman | Nimzo-Indian Defense: Kmoch Variation | |
| May 2, 2026 | Grooten | 1–0 | Uitermark | Round 3: Grooten, Herman - Uitermark, Imre | Queen's Gambit Declined: Modern Variation, Normal Line | |
| May 2, 2026 | Veenstra | 0–1 | Grooten | Round 2: Veenstra, Frits - Grooten, Herman | Queen's Indian Defense: Kasparov Variation | |
| May 2, 2026 | Grooten | 1–0 | Kshirsagar | Round 1: Grooten, Herman - Kshirsagar, Parth | Queen's Gambit Declined: Modern Variation, Normal Line | |
| Apr 11, 2026 | Hommerson | 1–0 | Grooten | Round 9: Hommerson, Paul - Grooten, Herman | Indian Defense: Knights Variation | |
| Mar 8, 2026 | Grooten | 0–1 | Kuipers | Meesterklasse | Queen's Gambit Declined: Three Knights Variation | |
| Feb 7, 2026 | Van Haastert | 1–0 | Grooten | Round 7: Van Haastert, Edwin - Grooten, Herman | Sicilian Defense: Closed | |
| Dec 29, 2025 | Grooten | ½–½ | Chua | Round 9: Grooten, Herman - Chua, Ethan | King's Indian Defense: Orthodox Variation, Aronin-Taimanov Defense | |
| Dec 28, 2025 | Van Foreest | 1–0 | Grooten | Round 8: Van Foreest, Machteld - Grooten, Herman | Sicilian Defense: Najdorf Variation, Zagreb Variation | |
| Dec 28, 2025 | Grooten | ½–½ | Smeets | Round 7: Grooten, Herman - Smeets, Kobe | Queen's Gambit Accepted | |
| Dec 27, 2025 | Shivika Rohilla | 0–1 | Grooten | Chessfestival Groningen 2025 Open A | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Dec 26, 2025 | Grooten | 1–0 | Grooten | Round 6: Grooten, Tommy - Grooten, Herman | Benoni Defense: Fianchetto Variation | |
| Dec 26, 2025 | Jakhari | 0–1 | Grooten | Round 5: Jakhari, Ansh - Grooten, Herman | Zukertort Opening | |
| Dec 26, 2025 | De Wit | 0–1 | Grooten | Chessfestival Groningen 2025 Open A | Sicilian Defense: Moscow Variation | |
| Dec 24, 2025 | Grooten | 1–0 | Maris | Round 5: Grooten, Herman - Maris, Ivo | Horwitz Defense | |
| Dec 23, 2025 | Grooten | 0–1 | Sydykov | Round 3: Grooten, Herman - Sydykov, Bayastan | Bogo-Indian Defense: Grünfeld Variation | |
| Dec 21, 2025 | Grooten | 0–1 | Manafov | Round 1: Grooten, Herman - Manafov, Vugar | Bogo-Indian Defense: Grünfeld Variation | |
| Nov 25, 2025 | Grooten | 1–0 | Dinanath | KNSB competitie 2025/2026 | Queen's Gambit Declined: Orthodox Defense, Main Line | |
| Nov 7, 2025 | Klaska | 1–0 | Grooten | KNSB competitie 2025/2026 | Sicilian Defense: French Variation | |
| Oct 25, 2025 | Grooten | 1–0 | Lind | Round 9: Grooten, Herman - Lind, Jacco | Grünfeld Defense: Three Knights Variation, Petrosian System | |
| Oct 24, 2025 | Valiente | 0–1 | Grooten | Round 8: Valiente, Paulo - Grooten, Herman | English Opening | |
| Oct 23, 2025 | Grooten | 0–1 | Mijnheer | Round 7: Grooten, Herman - Mijnheer, Peter | Dutch Defense: Classical Variation | |
| Oct 22, 2025 | Grooten | 1–0 | Timmermans | Round 6: Grooten, Herman - Timmermans, Raymond | Queen's Gambit Accepted: Alekhine Defense | |
| Oct 21, 2025 | Gergin | 0–1 | Grooten | Round 5: Gergin, Isafara - Grooten, Herman | Sicilian Defense: Najdorf Variation | |
| Oct 21, 2025 | Grooten | 1–0 | Gerrits | Round 4: Grooten, Herman - Gerrits, Augustin | Slav Defense: Modern Line | |
| Oct 20, 2025 | Van de Pavoordt | 1–0 | Grooten | Round 3: Van de Pavoordt, Max - Grooten, Herman | English Opening: King's English Variation, Taimanov Variation | |
| Oct 19, 2025 | Grooten | 0–1 | Abel Sajan | Round 2: Grooten, Herman - Abel Sajan | Grünfeld Defense: Stockholm Variation | |
| Oct 18, 2025 | De Jong | 1–0 | Grooten | Round 1: De Jong, Lode - Grooten, Herman | Benoni Defense: Fianchetto Variation | |
| Oct 4, 2025 | Grooten | ½–½ | Hilwerda | Round 2: Grooten, Herman - Hilwerda, Jonas | King's Indian Defense: Orthodox Variation, Aronin-Taimanov Defense | |
| Sep 22, 2025 | Grooten | 0–1 | Zhu | KNSB competitie 2025/2026 | Queen's Indian Defense: Kasparov-Petrosian Variation, Main Line | |
| Sep 13, 2025 | Schilstra | ½–½ | Grooten | Round 10: Schilstra, Laurens - Grooten, Herman | Sicilian Defense: Delayed Alapin Variation | |
| Sep 13, 2025 | Grooten | 0–1 | Bosboom | Round 9: Grooten, Herman - Bosboom, Manuel | King's Indian Defense: Orthodox Variation, Positional Defense, Closed Line | |
| Sep 13, 2025 | Arthur De Winter | 1–0 | Grooten | Round 8: Arthur De Winter - Grooten, Herman | Sicilian Defense: Kan Variation | |
| Sep 13, 2025 | Grooten | 0–1 | Erik Van Den Doel | Round 7: Grooten, Herman - Erik Van Den Doel | Slav Defense: Modern Line | |
| Sep 13, 2025 | Bok | 1–0 | Grooten | Round 6: Bok, Benjamin - Grooten, Herman | Nimzo-Indian Defense: Classical Variation, Berlin Variation | |
| Sep 13, 2025 | Grooten | 0–1 | Vrolijk | Round 5: Grooten, Herman - Vrolijk, Liam | Semi-Slav Defense | |
| Sep 13, 2025 | Loek Van Wely | 1–0 | Grooten | Round 4: Loek Van Wely - Grooten, Herman | Queen's Indian Defense: Kasparov Variation | |
| Sep 13, 2025 | Grooten | 0–1 | Hing Ting Lai | Round 3: Grooten, Herman - Hing Ting Lai | Queen's Indian Defense: Kasparov-Petrosian Variation, Main Line | |
| Sep 13, 2025 | Mees Van Batenburg | 1–0 | Grooten | Round 2: Mees Van Batenburg - Grooten, Herman | Sicilian Defense: Wing Gambit, Marshall Variation | |
| Sep 13, 2025 | Grooten | ½–½ | Grooten | Round 1: Grooten, Herman - Grooten, Tommy | Slav Defense: Exchange Variation, Symmetrical Line | |
| Sep 13, 2025 | Grooten | 0–1 | Meulmeester | 3.5: Grooten, Herman - Meulmeester, Luuk | Bogo-Indian Defense: Grünfeld Variation | |
| Sep 13, 2025 | Kazarian | 0–1 | Grooten | 3.4: Kazarian, Anna-Maja - Grooten, Herman | Sicilian Defense: Kan Variation, Maróczy Bind, Réti Variation | |
| Sep 13, 2025 | Bram Van Der Velden | 0–1 | Grooten | 3.3: Bram Van Der Velden - Grooten, Herman | Nimzo-Indian Defense: Three Knights Variation | |
| Sep 13, 2025 | Grooten | 1–0 | Gijsen | 3.2: Grooten, Herman - Gijsen, William | Queen's Gambit Declined: Ragozin Defense | |
| Sep 13, 2025 | Rogelio Lujan Garcia | 0–1 | Grooten | 3.1: Rogelio Lujan Garcia - Grooten, Herman | Indian Defense: Gibbins-Weidenhagen Gambit | |
| Sep 13, 2025 | Grooten | 1–0 | Smeets | 2.5: Grooten, Herman - Smeets, Kobe | Queen's Gambit Declined | |
| Sep 13, 2025 | Habig | 0–1 | Grooten | 2.4: Habig, Bryan - Grooten, Herman | English Opening: Symmetrical Variation, Normal Variation | |
| Sep 13, 2025 | Grooten | 0–1 | Arno Van Der Lubben | 2.3: Grooten, Herman - Arno Van Der Lubben | Queen's Gambit Accepted: Classical Defense, Alekhine System | |
| Sep 13, 2025 | Erik Van Den Doel | ½–½ | Grooten | 2.2: Erik Van Den Doel - Grooten, Herman | Zukertort Opening | |
| Sep 13, 2025 | Grooten | 0–1 | Bosboom | 2.1: Grooten, Herman - Bosboom, Manuel | King's Indian Defense: Orthodox Variation | |
| Sep 12, 2025 | Grooten | 1–0 | Schoorl | Round 11: Grooten, Herman - Schoorl, Rob | Slav Defense: Modern Line | |
| Jul 30, 2025 | Grooten | 1–0 | Elferink | Round 9: Grooten, Herman - Elferink, Leon | Queen's Gambit Declined: Ragozin Defense, Alekhine Variation | |
| Jul 29, 2025 | Boeren | 0–1 | Grooten | Round 8: Boeren, Jurriaan - Grooten, Herman | Sicilian Defense: Kan Variation, Maróczy Bind, Réti Variation | |
| Jul 28, 2025 | Grooten | 0–1 | Vos | Round 7: Grooten, Herman - Vos, Tjark | English Opening: Anglo-Indian Defense, Anti-Anti-Grünfeld | |
| Jul 27, 2025 | Ten Dam | ½–½ | Grooten | Round 6: Ten Dam, Bram - Grooten, Herman | Sicilian Defense: Kan Variation | |
| Jul 26, 2025 | Grooten | 1–0 | Khatniuk | Round 5: Grooten, Herman - Khatniuk, Anastasiia | Queen's Gambit Declined: Tartakower Defense | |
| Jul 25, 2025 | Bruggink | 1–0 | Grooten | Round 4: Bruggink, Tycho - Grooten, Herman | Zukertort Opening | |
| Jul 24, 2025 | Grooten | ½–½ | Aditya Kunal Patil | Round 3: Grooten, Herman - Aditya Kunal Patil | Queen's Gambit Declined: Queen's Knight Variation | |
| Jul 23, 2025 | Bus | 0–1 | Grooten | Round 2: Bus, Tom - Grooten, Herman | English Opening: Symmetrical Variation, Hedgehog Defense | |
| Jul 22, 2025 | Grooten | 0–1 | Den Heijer | Round 1: Grooten, Herman - Den Heijer, Rolinde | Queen's Gambit Declined: Vienna Variation, Quiet Variation | |
| Jun 1, 2025 | Elgersma | 1–0 | Grooten | Round 5: Elgersma, Onno - Grooten, Herman | Sicilian Defense: Kan Variation | |
| May 31, 2025 | Van de Griendt | 1–0 | Grooten | Round 3: Van de Griendt, Jan Willem - Grooten, Herman | King's Indian Defense: Steiner Attack | |
| May 18, 2025 | Grooten | 0–1 | Van der Werf | Round 6: Grooten, Herman - Van der Werf, Joel | Queen's Gambit Declined: Ragozin Defense, Alekhine Variation | |
| May 18, 2025 | Madularea | 0–1 | Grooten | Round 5: Madularea, David - Grooten, Herman | Sicilian Defense: French Variation | |
| May 17, 2025 | Garay | 0–1 | Grooten | Round 2: Garay, Enzo - Grooten, Herman | Caro-Kann Defense | |
| May 16, 2025 | Grooten | 1–0 | Hubers | Round 1: Grooten, Herman - Hubers, Daan | Semi-Slav Defense | |
| May 13, 2025 | Grooten | 0–1 | Van Wely | Round 3: Grooten, Herman - Van Wely, Loek | Grünfeld Defense: Stockholm Variation | |
| Mar 15, 2025 | Grooten | * | Van der Wiel | Round 2: Grooten, Herman - Van der Wiel, John T.H. | ? | |
| Mar 15, 2025 | Grooten | 0–1 | Dgebuadze | Round 4: Grooten, Herman - Dgebuadze, Alexandre | Bogo-Indian Defense: Grünfeld Variation | |
| Mar 15, 2025 | Grooten | * | Lopez | Round 6: Grooten, Herman - Lopez, Jasel | ? | |
| Mar 15, 2025 | Oskam | * | Grooten | Round 1: Oskam, Julian - Grooten, Herman | ? | |
| Mar 15, 2025 | Vrolijk | 1–0 | Grooten | Round 3: Vrolijk, Liam - Grooten, Herman | Queen's Indian Defense: Fianchetto Variation, Check Variation, Intermezzo Line | |
| Mar 15, 2025 | Dovgaliuk | * | Grooten | Round 5: Dovgaliuk, Oleksandr - Grooten, Herman | ? | |
| Mar 15, 2025 | Bosboom | * | Grooten | Round 7: Bosboom, Manuel - Grooten, Herman | ? | |
| Jul 29, 2024 | Zwirs | 0–1 | Grooten | Round 6: Zwirs, Jasper - Grooten, Herman | Rapport-Jobava System | |
| Jul 27, 2024 | Grooten | 0–1 | Leenhouts | Round 5: Grooten, Herman - Leenhouts, Koen | Queen's Gambit Declined: Vienna Variation, Quiet Variation | |
| Jul 26, 2024 | Grooten | 1–0 | Smid | Round 4: Grooten, Herman - Smid, Jelle | Nimzo-Larsen Attack: Classical Variation | |
| Jul 25, 2024 | Bus | 0–1 | Grooten | Round 3: Bus, Tom - Grooten, Herman | Queen's Indian Defense: Fianchetto Variation, Nimzowitsch Variation | |
| Jul 24, 2024 | Grooten | ½–½ | Van de Pavoordt | Round 2: Grooten, Herman - Van de Pavoordt, Max | Slav Defense: Modern Line | |
| Jul 23, 2024 | Koster | ½–½ | Grooten | Round 1: Koster, Chiel - Grooten, Herman | Caro-Kann Defense | |
| Jun 15, 2024 | Leenen | 1–0 | Grooten | Round 9: Leenen, Boyd - Grooten, Herman | Queen's Indian Defense: Kasparov Variation | |