| 1 ago 2026 | Kolimar, Kristof Pal 2357 | Grooten, Tommy 2294 | 0-1 | A85 Defensa Holandesa: Queen's Knight Variation | European Youth Team Chess Championship - Open18 | 33 | Ver |
| 19 jul 2026 | Grooten, Tommy 2294 | Duijker, Rick 2195 | ½-½ | A05 Apertura Zukertort | Amsterdam Chess Festival 2026 - Groep A | 28 | Ver |
| 18 jul 2026 | Belin, Anton 2206 | Grooten, Tommy 2294 | ½-½ | B30 Defensa Siciliana: Nyezhmetdinov-Rossolimo Attack | Amsterdam Chess Festival 2026 - Groep A | 14 | Ver |
| 17 jul 2026 | Grooten, Tommy 2294 | Kazarjan, Gachatur 2299 | ½-½ | D35 Gambito de Dama rehusado: Exchange Variation, Positional Variation | Amsterdam Chess Festival 2026 - Groep A | 46 | Ver |
| 16 jul 2026 | Schilstra, Laurens 2194 | Grooten, Tommy 2294 | 0-1 | B30 Defensa Siciliana: Nyezhmetdinov-Rossolimo Attack | Amsterdam Chess Festival 2026 - Groep A | 53 | Ver |
| 15 jul 2026 | Grooten, Tommy 2294 | Vroombout, Enrico 2066 | 1-0 | E92 Defensa India de Rey: Petrosian Variation, Stein Defense | Amsterdam Chess Festival 2026 - Groep A | 31 | Ver |
| 20 jun 2026 | Grooten, Tommy 2308 | Midem, Ismail Eren 2026 | ½-½ | A13 Apertura Inglesa: Neo-Catalan | HSG Open 2026 A | 56 | Ver |
| 19 jun 2026 | Grooten, Tommy 2308 | Grooten, Herman 2177 | 0-1 | A05 Apertura Zukertort | HSG Open 2026 A | 51 | Ver |
| 19 jun 2026 | Mullink, Jochem 2161 | Grooten, Tommy 2308 | 0-1 | B94 Defensa Siciliana: Najdorf Variation | HSG Open 2026 A | 76 | Ver |
| 24 may 2026 | Grooten, Tommy 2356 | Simenon, Jozef 2288 | 1-0 | A04 Apertura Zukertort: Queenside Fianchetto Variation | Qualification Dutch Championship 2026 | 31 | Ver |
| 23 may 2026 | Grooten, Tommy 2356 | Den Hartog, Marijn 2209 | 0-1 | D31 Gambito de Dama rehusado: Janowski Variation | Qualification Dutch Championship 2026 | 24 | Ver |
| 19 may 2026 | Slagboom, Leandro 2334 | Grooten, Tommy 2356 | 1-0 | B51 Defensa Siciliana: Moscow Variation | Qualification Dutch Championship 2026 | 66 | Ver |
| 19 may 2026 | Grooten, Tommy 2356 | Bekker, Stefan 2367 | ½-½ | A46 Defensa India: London System | Qualification Dutch Championship 2026 | 42 | Ver |
| 19 may 2026 | Ootes, Lars 2363 | Grooten, Tommy 2356 | 0-1 | D42 Gambito de Dama rehusado: Semi-Tarrasch Defense, Main Line | Qualification Dutch Championship 2026 | 59 | Ver |
| 19 may 2026 | Grooten, Tommy 2356 | Pel, Bonno 2286 | 0-1 | A04 Apertura Zukertort: Kingside Fianchetto | Qualification Dutch Championship 2026 | 43 | Ver |
| 19 may 2026 | De Boer, Eelke 2406 | Grooten, Tommy 2356 | 1-0 | B92 Defensa Siciliana: Najdorf Variation, Opocensky Variation | Qualification Dutch Championship 2026 | 53 | Ver |
| 19 may 2026 | Jellema, Pieter 2193 | Grooten, Tommy 2356 | 0-1 | A45 Defensa India: Paleface Attack, Blackmar-Diemer Gambit Deferred | Qualification Dutch Championship 2026 | 77 | Ver |
| 19 may 2026 | Grooten, Tommy 2356 | Kamphuis, Jasper 2134 | 1-0 | A09 Apertura Réti: Advance Variation, Michel Gambit | Qualification Dutch Championship 2026 | 26 | Ver |
| 19 may 2026 | Grooten, Tommy 2356 | Terlouw, Wouter 2259 | ½-½ | A30 Apertura Inglesa: Symmetrical Variation | Qualification Dutch Championship 2026 | 60 | Ver |
| 19 may 2026 | Aravindhan, Achyuth 2213 | Grooten, Tommy 2356 | ½-½ | B40 Defensa Siciliana: French Variation | Qualification Dutch Championship 2026 | 36 | Ver |