Progress against the field
Between Rotterdam 2025 and Heerenveen 2026, Jannie Jilderda lost 1:58 to the field.
The clock says 4:18 faster, but the races themselves got 6:16 quicker for everyone.
The longest gap between two races compared here, 328 days between Rotterdam 2025 and Amsterdam 2026, cost 2:56 on 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
6 races · 5 events
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Maastricht19 Sep 2026Individual Open · Women1:27:4373/295Beat 75%
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Maastricht19 Sep 2026Doubles Open · Women1:14:30 PB34/240Beat 86%
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Stockholm18 Jun 2026Individual Open · Women1:24:2119/110Beat 83%
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Heerenveen14 May 2026Individual Open · Women1:22:48 PB84/427Beat 80%
↑ 113 days after Amsterdam 2026 0:58 better than the field Why ↓Close ↑
2:17 faster on the clock, and the race was 1:19 faster for everyone, so 0:58 of it was this athlete.
The fieldCompare these two →1:19 faster This athlete2:17 faster -
Amsterdam21 Jan 2026Individual Open · Women1:25:05338/1122Beat 70%
↑ 328 days after Rotterdam 2025 2:56 worse than the field Faster on the clock, behind the field Why ↓Close ↑
2:01 faster on the clock looks better than it was: the race was 4:57 faster for everyone, which leaves this 2:56 behind the field.
The fieldCompare these two →4:57 faster This athlete2:01 faster -
Rotterdam27 Feb 2025Individual Open · Women1:27:0657/203Beat 72%