Progress against the field
Between Heerenveen 2025 and Amsterdam 2026, Britt van der Zwan lost 1:38 to the field.
Over the same races everyone got 7:23 quicker, so 5:45 faster on the clock looks better than it was.
The longest gap between two races compared here, 203 days between Heerenveen 2025 and Utrecht 2025, still ended 1:40 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. The summary above covers Individual Open · Women, the one raced most; every comparison is in the list below.
Every race
7 races · 7 events
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Rotterdam15 Apr 2026Relay · Mixed59:465/86Beat 94%
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Amsterdam21 Jan 2026Individual Open · Women1:37:11 PB730/1122Beat 35%
↑ 54 days after Utrecht 2025 3:18 worse than the field Faster on the clock, behind the field Why ↓Close ↑
2:06 faster on the clock, yet the race was 5:24 faster for everyone, so 3:18 was lost on the field.
The fieldCompare these two →5:24 faster This athlete2:06 faster -
Utrecht28 Nov 2025Individual Open · Women1:39:17357/619Beat 42%
↑ 203 days after Heerenveen 2025 1:40 better than the field Why ↓Close ↑
1:40 better than the field: 3:39 faster on the clock, against 1:59 faster for everyone.
The fieldCompare these two →1:59 faster This athlete3:39 faster -
Maastricht19 Sep 2025Doubles Open · Mixed1:27:21372/658Beat 44%
↑ 167 days after Belgium 2025, with Dennis Veenbrink 4:04 worse than the field Why ↓Close ↑
4:04 behind the field: 4:53 slower on the clock, against 0:49 slower for everyone.
The fieldCompare these two →0:49 slower This pair4:53 slower -
Heerenveen9 May 2025Individual Open · Women1:42:56386/571Beat 32%
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Belgium5 Apr 2025Doubles Open · Mixed1:22:28 PB404/722Beat 44%
↑ 364 days after Rotterdam 2024, with Dennis Veenbrink 17:50 better than the field Why ↓Close ↑
23:27 faster on the clock, and the race was 5:37 faster for everyone, so 17:50 of it was this pair.
The fieldCompare these two →5:37 faster This pair23:27 faster -
Rotterdam6 Apr 2024Doubles Open · Mixed1:45:55496/534Beat 7%