| Athletes |
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Biographical data for: Tamar KOOLWIJK
| Classifications in season 2025/2026: |
| 30/08/25 | Heerenveen NED | National Opening Competition NED | Division D | | Overall Ranking: 22nd, 1000 meter: 22nd | | 05/09/25 | Dresden GER | Dresden Invitational | Women | | Overall Ranking: 19th, 500 meter: 14th, 1000 meter: 21st, 1500 meter: 18th | | 13/09/25 | Heerenveen NED | National Qualifying NED for World Tour | Dames B | | Overall Ranking: 6th, 500 meter: 8th, 1000 meter: 6th, 1500 meter: 7th | | 08/10/25 | Heerenveen NED | Time Trials NED for Junior World Cup | Dames | | 111 m TT: 11th, 333 m: 11th, 666 m: 11th | | 10/10/25 | Rostock GER | Hanse Cup 30st - Golden Sun Award | Women SABC preliminary | | Overall Ranking: 45th, 500 meter: 45th | | 10/10/25 | Rostock GER | Hanse Cup 30st - Golden Sun Award | Women SABC PG1 | | Overall Ranking: 23rd, 500 meter: 21st, 1000 meter: 18th, 1500 meter: 21st | | 08/11/25 | Utrecht NED | National League NED-breed-1 | Divisie B | | Overall Ranking: 24th, 1500 meter: 24th |
| Results in season 2025/2026: |
| 500 meter |
| 48 | .111 | 11/10/25 | Rostock GER | Hanse Cup 30st - Golden Sun Award | Quarter Finals, Group 1 | |
| 48 | .130 | 10/10/25 | Rostock GER | Hanse Cup 30st - Golden Sun Award | Round 2, Group 1 | |
| 48 | .196 | 11/10/25 | Rostock GER | Hanse Cup 30st - Golden Sun Award | Semi Final, Group 2 | |
| 48 | .227 | 06/09/25 | Dresden GER | Dresden Invitational | Quarter Finals, Group 1 | |
| 48 | .236 | 10/10/25 | Rostock GER | Hanse Cup 30st - Golden Sun Award | Round 1, Group 1 | |
| 48 | .250 | 05/09/25 | Dresden GER | Dresden Invitational | Heats, Group 1 | |
| 48 | .284 | 11/10/25 | Rostock GER | Hanse Cup 30st - Golden Sun Award | Final, Group 5 | |
| 48 | .345 | 13/09/25 | Heerenveen NED | National Qualifying NED for World Tour | Finale, Final B | |
| 48 | .540 | 13/09/25 | Heerenveen NED | National Qualifying NED for World Tour | Halve Finales, Group 1 | |
| 48 | .576 | 06/09/25 | Dresden GER | Dresden Invitational | Final, Group 3 | |
| 49 | .046 | 06/09/25 | Dresden GER | Dresden Invitational | Rep. Semi Final, Group 1 | |
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| 1000 meter |
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| 1500 meter |
| 2:34 | .757 | 06/09/25 | Dresden GER | Dresden Invitational | Final, Group 3 | |
| 2:39 | .933 | 08/11/25 | Utrecht NED | National League NED-breed-1 | Final, Groep 4 | |
| 2:40 | .451 | 06/09/25 | Dresden GER | Dresden Invitational | Semi Final, Group 1 | |
| 2:43 | .076 | 13/09/25 | Heerenveen NED | National Qualifying NED for World Tour | Halve Finales, Group 1 | |
| 2:44 | .755 | 05/09/25 | Dresden GER | Dresden Invitational | Quarter Finals, Group 1 | |
| 2:46 | .294 | 08/11/25 | Utrecht NED | National League NED-breed-1 | Quarter Finals, Groep 1 | |
| 2:46 | .799 | 13/09/25 | Heerenveen NED | National Qualifying NED for World Tour | Finale, Final A | |
| 2:48 | .727 | 10/10/25 | Rostock GER | Hanse Cup 30st - Golden Sun Award | Semi Final, Group 1 | |
| 2:50 | .334 | 08/11/25 | Utrecht NED | National League NED-breed-1 | Semi Final, Groep 2 | |
| 2:54 | .021 | 10/10/25 | Rostock GER | Hanse Cup 30st - Golden Sun Award | Final, Group 4 | |
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| 2000 meter relay |
| 3:04 | .713 | 08/11/25 | Utrecht NED | National League NED-breed-1 | Final, Groep 1 | |
| (Team K: Tamar Koolwijk, Marjolein Ooms, Lobke van Benthum, Lieuwe Van Den Berg) |
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| 3000 meter relay |
| 4:29 | .517 | 14/09/25 | Heerenveen NED | National Qualifying NED for World Tour | Finale, Final A | |
| (team B: Boet Groenewegen, Tamar Koolwijk, Peter Murphy, Mika Salomonsson) |
| 4:30 | .352 | 30/08/25 | Heerenveen NED | National Opening Competition NED | Final, Group 1 | |
| (S1-Team3: Mijntje de Jong, Tamar Koolwijk, Senne Van de Rest, Leon Van Steinvoorn) |
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