| Jun 10, 2026 | Delaney | 0–1 | Van der Werf | Round 9: Delaney, John - Van der Werf, Mark | Indian Defense: Pseudo-Benko | |
| Jun 9, 2026 | Van der Werf | ½–½ | Dishman | Round 8: Van der Werf, Mark - Dishman, Stephen | Four Knights Game: Scotch Variation Accepted, Main Line | |
| Jun 8, 2026 | Sielecki | ½–½ | Van der Werf | Round 7: Sielecki, Christof - Van der Werf, Mark | Ruy Lopez: Closed, Delayed Exchange | |
| Jun 7, 2026 | Van der Werf | ½–½ | Mannion | Round 6: Van der Werf, Mark - Mannion, Stephen R | English Opening: King's English Variation, Four Knights Variation, Fianchetto Line, with Nb6 | |
| Jun 6, 2026 | Tocchioni | 0–1 | Van der Werf | Round 5: Tocchioni, Doriano - Van der Werf, Mark | Indian Defense: Spielmann-Indian | |
| Jun 5, 2026 | Van der Werf | 0–1 | Berend | Round 4: Van der Werf, Mark - Berend, Fred | English Opening: King's English Variation, Four Knights Variation, Fianchetto Line | |
| Jun 4, 2026 | Van Ketel | ½–½ | Van der Werf | Round 3: Van Ketel, Raoul - Van der Werf, Mark | Nimzo-Indian Defense: Kmoch Variation | |
| Jun 3, 2026 | Van der Werf | 1–0 | Markowski | Round 2: Van der Werf, Mark - Markowski, Damian | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Jun 2, 2026 | Riekenbrauk | 0–1 | Van der Werf | Round 1: Riekenbrauk, Joerg - Van der Werf, Mark | Sicilian Defense: Delayed Alapin Variation, with e6 | |
| May 24, 2026 | Van der Werf | 0–1 | Slagboom | Tiebreak partij 4: Van der Werf, Mark - Slagboom, Leandro | Zukertort Opening | |
| May 24, 2026 | Slagboom | 1–0 | Van der Werf | Tiebreak partij 3: Slagboom, Leandro - Van der Werf, Mark | Italian Game: Two Knights Defense, Modern Bishop's Opening | |
| May 24, 2026 | Slagboom | 1–0 | Van der Werf | Tiebreak partij 2: Slagboom, Leandro - Van der Werf, Mark | Italian Game: Giuoco Pianissimo, Italian Four Knights Variation | |
| May 24, 2026 | Van der Werf | 1–0 | Slagboom | Tiebreak partij 1: Van der Werf, Mark - Slagboom, Leandro | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| May 24, 2026 | Van der Werf | 0–1 | Ootes | Round 13: Van der Werf, Mark - Ootes, Lars | Pirc Defense: Classical Variation, Quiet System | |
| May 24, 2026 | De Boer | ½–½ | Van der Werf | Round 12: De Boer, Eelke - Van der Werf, Mark | Ruy Lopez: Closed, Martinez Variation | |
| May 24, 2026 | Van der Werf | ½–½ | Jellema | Round 11: Van der Werf, Mark - Jellema, Pieter | Dutch Defense: Classical Variation | |
| May 24, 2026 | Den Hartog | 0–1 | Van der Werf | Round 10: Den Hartog, Marijn - Van der Werf, Mark | Mieses Opening | |
| May 24, 2026 | Grochal | ½–½ | Van der Werf | Round 8: Grochal, Joey - Van der Werf, Mark | Blumenfeld Countergambit Accepted | |
| May 24, 2026 | Van der Werf | 1–0 | Aravindhan | Round 9: Van der Werf, Mark - Aravindhan, Achyuth | Tarrasch Defense: Two Knights Variation | |
| May 23, 2026 | Van der Werf | 1–0 | Simenon | Round 5: Van der Werf, Mark - Simenon, Jozef | Polish Defense | |
| May 23, 2026 | Van der Werf | ½–½ | Bekker | Round 7: Van der Werf, Mark - Bekker, Stefan | Nimzo-Indian Defense: Rubinstein System, Hübner Variation | |
| May 23, 2026 | Pel | 0–1 | Van der Werf | Round 6: Pel, Bonno - Van der Werf, Mark | Hungarian Opening | |
| May 23, 2026 | Kamphuis | 0–1 | Van der Werf | Round 4: Kamphuis, Jasper - Van der Werf, Mark | Scotch Game: Scotch Gambit, Advance Variation | |
| May 23, 2026 | Van der Werf | ½–½ | Terlouw | Round 3: Van der Werf, Mark - Terlouw, Wouter | Nimzo-Indian Defense: St. Petersburg Variation, Fischer Variation | |
| May 23, 2026 | Slagboom | ½–½ | Van der Werf | Round 1: Slagboom, Leandro - Van der Werf, Mark | Ruy Lopez: Closed, Anti-Marshall | |
| May 19, 2026 | Grooten | 0–1 | Van der Werf | Round 2: Grooten, Tommy - Van der Werf, Mark | Blumenfeld Countergambit Accepted | |
| Apr 11, 2026 | Jakhari | 0–1 | Van der Werf | Round 9: Jakhari, Ansh - Van der Werf, Mark | Zukertort Opening: Quiet System | |
| Mar 28, 2026 | Van der Werf | ½–½ | Maatman | Round 6: Van der Werf, Mark - Maatman, Nick | Nimzo-Indian Defense: Normal Variation, Gligoric System | |
| Mar 8, 2026 | Van der Werf | ½–½ | Bosch | KNSB competitie 2025/2026 | Queen's Gambit Declined: Orthodox Defense, Swiss, Carlsbad Variation | |
| Feb 7, 2026 | Dovgaliuk | 1–0 | Van der Werf | Round 7: Dovgaliuk, Oleksandr - Van der Werf, Mark | Four Knights Game: Gunsberg Variation | |
| Dec 26, 2025 | Van der Werf | 1–0 | Donker | Round 5: Van der Werf, Mark - Donker, Roel | Slav Defense | |
| Nov 22, 2025 | Lombaers | 1–0 | Van der Werf | Round 4: Lombaers, Peter - Van der Werf, Mark | Benoni Defense: Knight's Tour Variation | |
| Nov 1, 2025 | Van der Werf | 0–1 | Bugayev | Round 11: Van der Werf, Mark - Bugayev, Vladimir | Benko Gambit Accepted: Modern Variation | |
| Oct 31, 2025 | Farahat | ½–½ | Van der Werf | Round 10: Farahat, Ali - Van der Werf, Mark | Queen's Pawn Game: Colle System | |
| Oct 30, 2025 | Van der Werf | ½–½ | Lacasa Diaz | Round 9: Van der Werf, Mark - Lacasa Diaz, Josep Anton | Tarrasch Defense: Two Knights Variation | |
| Oct 29, 2025 | Martens | ½–½ | Van der Werf | Round 8: Martens, Martin - Van der Werf, Mark | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Oct 28, 2025 | Van der Werf | ½–½ | Georgiev | Round 7: Van der Werf, Mark - Georgiev, Kiril | Nimzo-Indian Defense: St. Petersburg Variation, Fischer Variation | |
| Oct 26, 2025 | Van der Werf | 1–0 | Bravetti | Round 6: Van der Werf, Mark - Bravetti, Antonio | Benoni Defense | |
| Oct 25, 2025 | Van Ketel | ½–½ | Van der Werf | Round 5: Van Ketel, Raoul - Van der Werf, Mark | Rat Defense: English Rat | |
| Oct 24, 2025 | Van der Werf | ½–½ | Betaneli | Round 4: Van der Werf, Mark - Betaneli, Alexander | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Oct 23, 2025 | Obsivac | ½–½ | Van der Werf | Round 3: Obsivac, Josef - Van der Werf, Mark | Queen's Pawn Game: Zukertort Variation | |
| Oct 22, 2025 | Van der Werf | 1–0 | Cmiel | Round 2: Van der Werf, Mark - Cmiel, Thorsten | Benko Gambit Accepted: Modern Variation | |
| Oct 21, 2025 | Isaev | 0–1 | Van der Werf | Round 1: Isaev, Yuriy V - Van der Werf, Mark | English Opening: Neo-Catalan | |
| Oct 5, 2025 | Van der Werf | ½–½ | Oms Pallisse | European individual senior chess championship 2025 - Open 50+, Rabac, Croatia | Queen's Gambit Declined: Modern Variation | |
| Oct 4, 2025 | Holzke | ½–½ | Van der Werf | European individual senior chess championship 2025 - Open 50+, Rabac, Croatia | Queen's Gambit Declined: Exchange Variation, Sämisch Variation | |
| Oct 3, 2025 | Van der Werf | ½–½ | Thorhallsson | European individual senior chess championship 2025 - Open 50+, Rabac, Croatia | Queen's Gambit Declined: Modern Variation | |
| Oct 2, 2025 | Van der Werf | ½–½ | Sielecki | European individual senior chess championship 2025 - Open 50+, Rabac, Croatia | King's Indian Defense: Orthodox Variation, Gligoric-Taimanov System | |
| Oct 1, 2025 | Fercec | ½–½ | Van der Werf | European individual senior chess championship 2025 - Open 50+, Rabac, Croatia | Ruy Lopez: Morphy Defense, Anderssen Variation | |
| Sep 29, 2025 | Cmiel | 0–1 | Van der Werf | European individual senior chess championship 2025 - Open 50+, Rabac, Croatia | Nimzo-Indian Defense: Classical Variation, Noa Variation | |
| Sep 28, 2025 | Van der Werf | 1–0 | Farrell | European individual senior chess championship 2025 - Open 50+, Rabac, Croatia | Queen's Gambit Declined: Janowski Variation | |
| Sep 27, 2025 | Minnican | 0–1 | Van der Werf | European individual senior chess championship 2025 - Open 50+, Rabac, Croatia | Queen's Pawn Game: London System | |
| Sep 24, 2025 | Van der Werf | ½–½ | Degraeve | European individual senior chess championship 2025 - Open 50+, Rabac, Croatia | King's Indian Defense: Normal Variation, Rare Defenses | |
| Sep 20, 2025 | Van der Werf | 1–0 | Godzwon | Round 1: Van der Werf, Mark - Godzwon, Iwo | Nimzo-Indian Defense: Normal Variation | |
| May 29, 2025 | Zhu | ½–½ | Van der Werf | Semi-Finals | Tiebreaks: Zhu, Chenwu - Van der Werf, Mark | Ruy Lopez: Closed, Zaitsev System | |
| May 29, 2025 | Van der Werf | ½–½ | Lombaers | Finals: Van der Werf, Mark - Lombaers, Peter | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| May 29, 2025 | Van der Werf | 0–1 | Zhu | Semi-Finals: Van der Werf, Mark - Zhu, Chenwu | Nimzo-Indian Defense: Normal Variation, Gligoric System, Exchange Variation | |
| May 13, 2025 | Strating | ½–½ | Van der Werf | Round 9: Strating, Sybolt - Van der Werf, Mark | Benoni Defense: Fianchetto Variation | |
| Apr 5, 2025 | Van der Werf | 1–0 | Van Dael | Round 8: Van der Werf, Mark - Van Dael, Siem | King's Indian Defense: Orthodox Variation, Gligoric-Taimanov System | |
| Mar 8, 2025 | Slagboom | 1–0 | Van der Werf | Round 7: Slagboom, Leandro - Van der Werf, Mark | Italian Game: Two Knights Defense, Polerio Defense, Bishop Check Line | |
| Feb 25, 2025 | Van der Werf | ½–½ | Plotkin | WSTCC | Queen's Gambit Declined: Exchange Variation, Positional Variation | |
| Feb 24, 2025 | Van der Werf | 0–1 | Hjartarson | WSTCC | Nimzo-Indian Defense: Normal Variation, Botvinnik System | |
| Feb 23, 2025 | Bryson | 1–0 | Van der Werf | WSTCC | Bishop's Opening: Vienna Hybrid, Spielmann Attack | |
| Feb 21, 2025 | Van der Werf | 1–0 | Olivier | WSTCC | Slav Defense: Modern Line | |
| Feb 19, 2025 | Polak | 1–0 | Van der Werf | WSTCC | Bogo-Indian Defense: Exchange Variation | |
| Feb 8, 2025 | Kunin | 1–0 | Van der Werf | Round 6: Kunin, Vitaly - Van der Werf, Mark | Benoni Defense | |
| Nov 23, 2024 | Van der Werf | ½–½ | Beukema | KNSB Meesterklasse 2024-2025 | Slav Defense | |
| Oct 15, 2024 | Van der Werf | 1–0 | Sekandar | Round 2: Van der Werf, Mark - Sekandar, Kambiz | Queen's Gambit Accepted: Normal Variation | |
| Sep 21, 2024 | Van Delft | 0–1 | Van der Werf | Round 1: Van Delft, Merijn - Van der Werf, Mark | Ruy Lopez: Closed, Smyslov-Breyer-Zaitsev Hybrid | |
| May 15, 2024 | Van der Werf | ½–½ | Godena | European Senior Team Chess Championship 2024 - Section 50 + | Queen's Gambit Accepted: Classical Defense, Russian Gambit | |
| May 14, 2024 | Beaumont | 0–1 | Van der Werf | European Senior Team Chess Championship 2024 - Section 50 + | Benoni Defense: Fianchetto Variation | |
| May 13, 2024 | Miljanic | ½–½ | Van der Werf | European Senior Team Chess Championship 2024 - Section 50 + | Italian Game: Classical Variation, Giuoco Pianissimo, Albin Variation | |
| May 12, 2024 | Van der Werf | 1–0 | Denk | European Senior Team Chess Championship 2024 - Section 50 + | Benoni Defense: Old Benoni | |
| May 11, 2024 | Jackson | ½–½ | Van der Werf | European Senior Team Chess Championship 2024 - Section 50 + | Vienna Game: Vienna Gambit, Paulsen Attack | |
| May 10, 2024 | Van der Werf | ½–½ | Flear | European Senior Team Chess Championship 2024 - Section 50 + | Slav Defense | |
| May 9, 2024 | Van der Werf | 1–0 | Zimmermann | European Senior Team Chess Championship 2024 - Section 50 + | Grünfeld Defense: Three Knights Variation, Petrosian System | |
| May 8, 2024 | Varga | ½–½ | Van der Werf | European Senior Team Chess Championship 2024 - Section 50 + | Ruy Lopez: Morphy Defense, Duras Variation | |
| Dec 14, 2024 | Sochacki | ½–½ | Van der Werf | Round 5: Sochacki, Christophe - Van der Werf, Mark | Italian Game: Giuoco Pianissimo, Normal | |
| Nov 9, 2024 | Van der Werf | 1–0 | Dhooge | Round 3: Van der Werf, Mark - Dhooge, Servaas | King's Indian Defense: Orthodox Variation, Gligoric-Taimanov System | |
| Sep 15, 2024 | Van der Werf | 1–0 | Warnier | Round 9: Van der Werf, Mark - Warnier, Yanis | Nimzo-Indian Defense: St. Petersburg Variation, American Variation | |
| Sep 14, 2024 | Kalosha | ½–½ | Van der Werf | Round 8: Kalosha, Zhiulien Oleksii - Van der Werf, Mark | Benoni Defense: Classical Variation, New York Variation | |
| Sep 13, 2024 | Van der Werf | ½–½ | Soares | Round 7: Van der Werf, Mark - Soares, Luis Francisco Almeida | Benoni Defense: Czech Benoni Defense | |
| Sep 12, 2024 | Kavutskiy | ½–½ | Van der Werf | Round 6: Kavutskiy, Konstantin - Van der Werf, Mark | Benoni Defense: Classical Variation, Czerniak Defense, Tal Line | |
| Sep 11, 2024 | Van der Werf | 1–0 | Carnicelli | Round 4: Van der Werf, Mark - Carnicelli, Valerio | King's Indian Defense: Orthodox Variation, Gligoric-Taimanov System | |
| Sep 11, 2024 | Van der Werf | ½–½ | Alsina Leal | Round 5: Van der Werf, Mark - Alsina Leal, Daniel | Queen's Gambit Declined: Modern Variation | |
| Sep 10, 2024 | Kovacevic | 1–0 | Van der Werf | Round 3: Kovacevic, Blazimir - Van der Werf, Mark | English Opening: King's English Variation, Kramnik-Shirov Counterattack | |
| Sep 9, 2024 | Van der Werf | 1–0 | Djuric | Round 2: Van der Werf, Mark - Djuric, Stefan | Slav Indian | |
| Sep 8, 2024 | Kukushkin | 0–1 | Van der Werf | Round 1: Kukushkin, Ivan - Van der Werf, Mark | Bishop's Opening: Vienna Hybrid, Spielmann Attack | |
| Oct 9, 2022 | Gorshtein | ½–½ | Van der Werf | ECCC_22 | English Opening: King's English Variation | |
| Oct 7, 2022 | Van der Werf | ½–½ | Bogner | ECCC_22 | Nimzo-Indian Defense: Normal Variation, Gligoric System, Exchange Variation | |
| Oct 4, 2022 | Van der Werf | ½–½ | Wojtaszek | ECCC_22 | Nimzo-Indian Defense: Normal Variation, Gligoric System, Exchange Variation | |
| Oct 3, 2022 | Van der Werf | * | Gubanov | 37th European Club Cup | ? | |