Progress against the field
Between Belgium 2025 and Heerenveen 2026, Ilse Bosma and Tess Bosma pulled 11:12 ahead of the field.
Over the same races everyone got 6:51 quicker, so 18:03 faster on the clock looks better than it was.
The longest gap between two races compared here, 237 days between Belgium 2025 and Utrecht 2025, still ended 10:31 ahead of the field.
How this is worked out ⓘ
A finish time moves for two reasons: the athlete, and the race — its course, its floor, its day. For each pair of races in a row in one category, we take everyone who raced both and use the middle of how much they moved (the median) as "the race". Whatever is left is the athlete. Doubles are compared only when the same two people raced both, and told as the pair's; relays are left out. A pair with fewer than 15 athletes in common is not shown.
Every race
5 races · 4 events
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Heerenveen14 May 2026Doubles Open · Women1:28:12394/737Beat 47%
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Heerenveen14 May 2026Doubles Open · Women1:11:06 PB33/513Beat 94%
↑ 167 days after Utrecht 2025, with Tess Bosma 0:41 better than the field Why ↓Close ↑
4:41 faster on the clock, and the race was 4:00 faster for everyone, so 0:41 of it was this pair.
The fieldCompare these two →4:00 faster This pair4:41 faster -
Utrecht28 Nov 2025Doubles Open · Women1:15:4785/828Beat 90%
↑ 237 days after Belgium 2025, with Tess Bosma 10:31 better than the field Why ↓Close ↑
10:31 better than the field: 13:22 faster on the clock, against 2:51 faster for everyone.
The fieldCompare these two →2:51 faster This pair13:22 faster -
Heerenveen9 May 2025Individual Open · Women1:26:39 PB65/183Beat 65%
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Belgium5 Apr 2025Doubles Open · Women1:29:09391/713Beat 45%