Progress against the field
Between Rotterdam 2025 and Maastricht 2026, Boukje Groot pulled 0:51 ahead of the field.
The clock says 4:25 faster, but the races themselves got 3:34 quicker for everyone.
The biggest step was Gent 2025 → Amsterdam 2026: 2:10 on the field in 40 days.
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
6 races · 6 events
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Maastricht19 Sep 2026Individual Open · Women1:25:49117/577Beat 80%
↑ 241 days after Amsterdam 2026 0:52 worse than the field Why ↓Close ↑
0:52 behind the field: 2:46 slower on the clock, against 1:54 slower for everyone.
The fieldCompare these two →1:54 slower This athlete2:46 slower -
Heerenveen14 May 2026Doubles Open · Mixed1:08:05 PB57/461Beat 88%
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Amsterdam21 Jan 2026Individual Open · Women1:23:03 PB274/1122Beat 76%
↑ 40 days after Gent 2025 2:10 better than the field Why ↓Close ↑
2:10 better than the field: 4:53 faster on the clock, against 2:43 faster for everyone.
The fieldCompare these two →2:43 faster This athlete4:53 faster -
Gent12 Dec 2025Individual Open · Women1:27:56348/1009Beat 66%
↑ 288 days after Rotterdam 2025 0:27 worse than the field Faster on the clock, behind the field Why ↓Close ↑
2:18 faster on the clock, yet the race was 2:45 faster for everyone, so 0:27 was lost on the field.
The fieldCompare these two →2:45 faster This athlete2:18 faster -
Rotterdam27 Feb 2025Individual Open · Women1:30:14160/411Beat 61%
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Amsterdam10 Oct 2024Doubles Open · Women1:11:25 PB31/657Beat 95%