| 31 ago 2026 | Van der Werf, Mark 2376 | Ganaus, Hannes 2214 | 1-0 | D35 Queen's Gambit Declined: Exchange Variation, Positional Variation | European Senior Team Championships 2026 | Senior 50+ | 27 | Ver |
| 30 ago 2026 | Kirszenberg, Marc 2078 | Van der Werf, Mark 2376 | ½-½ | E20 Nimzo-Indian Defense: Kmoch Variation | European Senior Team Championships 2026 | Senior 50+ | 19 | Ver |
| 28 ago 2026 | Gormally, Daniel W 2393 | Van der Werf, Mark 2376 | 1-0 | A43 Indian Defense: Pseudo-Benko | European Senior Team Championships 2026 | Senior 50+ | 44 | Ver |
| 27 ago 2026 | Van der Werf, Mark 2376 | Delprato, Uberto 2024 | 1-0 | A41 Wade Defense | European Senior Team Championships 2026 | Senior 50+ | 25 | Ver |
| 10 jun 2026 | Delaney, John 2054 | Van der Werf, Mark 2384 | 0-1 | A43 Indian Defense: Pseudo-Benko | European Senior Chess Championship 2026 | 50+ | 57 | Ver |
| 9 jun 2026 | Van der Werf, Mark 2384 | Dishman, Stephen 2259 | ½-½ | C47 Four Knights Game: Scotch Variation Accepted, Main Line | European Senior Chess Championship 2026 | 50+ | 88 | Ver |
| 8 jun 2026 | Sielecki, Christof 2385 | Van der Werf, Mark 2384 | ½-½ | C85 Ruy Lopez: Closed, Delayed Exchange | European Senior Chess Championship 2026 | 50+ | 56 | Ver |
| 7 jun 2026 | Van der Werf, Mark 2384 | Mannion, Stephen R 2220 | ½-½ | A29 English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Nb6 | European Senior Chess Championship 2026 | 50+ | 37 | Ver |
| 6 jun 2026 | Tocchioni, Doriano 2119 | Van der Werf, Mark 2384 | 0-1 | A46 Indian Defense: Spielmann-Indian | European Senior Chess Championship 2026 | 50+ | 58 | Ver |
| 5 jun 2026 | Van der Werf, Mark 2384 | Berend, Fred 2208 | 0-1 | A29 English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | European Senior Chess Championship 2026 | 50+ | 56 | Ver |
| 4 jun 2026 | Van Ketel, Raoul 2234 | Van der Werf, Mark 2384 | ½-½ | E20 Nimzo-Indian Defense: Kmoch Variation | European Senior Chess Championship 2026 | 50+ | 23 | Ver |
| 3 jun 2026 | Van der Werf, Mark 2384 | Markowski, Damian 2108 | 1-0 | D35 Queen's Gambit Declined: Exchange Variation, Positional Variation | European Senior Chess Championship 2026 | 50+ | 123 | Ver |
| 24 may 2026 | Van der Werf, Mark 2384 | Slagboom, Leandro 2334 | 0-1 | A05 Zukertort Opening | Tiebreak partij 4: Van der Werf, Mark - Slagboom, Leandro | 30 | Ver |
| 24 may 2026 | Slagboom, Leandro 2334 | Van der Werf, Mark 2384 | 1-0 | C55 Italian Game: Two Knights Defense, Modern Bishop's Opening | Tiebreak partij 3: Slagboom, Leandro - Van der Werf, Mark | 57 | Ver |
| 24 may 2026 | Slagboom, Leandro 2334 | Van der Werf, Mark 2384 | 1-0 | C50 Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | Tiebreak partij 2: Slagboom, Leandro - Van der Werf, Mark | 28 | Ver |
| 24 may 2026 | Van der Werf, Mark 2384 | Slagboom, Leandro 2334 | 1-0 | D35 Queen's Gambit Declined: Exchange Variation, Positional Variation | Tiebreak partij 1: Van der Werf, Mark - Slagboom, Leandro | 38 | Ver |
| 24 may 2026 | Van der Werf, Mark 2384 | Ootes, Lars 2363 | 0-1 | B08 Pirc Defense: Classical Variation, Quiet System | Qualification Dutch Championship 2026 | 54 | Ver |
| 24 may 2026 | De Boer, Eelke 2406 | Van der Werf, Mark 2384 | ½-½ | C84 Ruy Lopez: Closed, Martinez Variation | Qualification Dutch Championship 2026 | 9 | Ver |
| 24 may 2026 | Van der Werf, Mark 2384 | Jellema, Pieter 2193 | ½-½ | A91 Dutch Defense: Classical Variation | Qualification Dutch Championship 2026 | 21 | Ver |
| 24 may 2026 | Den Hartog, Marijn 2209 | Van der Werf, Mark 2384 | 0-1 | A00 Mieses Opening | Qualification Dutch Championship 2026 | 50 | Ver |