Progress against the field
Liza Bierma has dropped 4:56 behind the field from Heerenveen 2025 to Heerenveen 2026.
The clock says 1:20 slower, but the races themselves got 3:36 quicker for everyone.
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
4 races · 4 events
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Heerenveen14 May 2026Individual Open · Women1:35:53230/427Beat 46%
↑ 370 days after Heerenveen 2025 4:56 worse than the field Why ↓Close ↑
1:20 slower on the clock in a race that was 3:36 faster for everyone: 4:56 lost to the field.
The fieldCompare these two →3:36 faster This athlete1:20 slower -
Heerenveen9 May 2025Individual Open · Women1:34:33 PB271/571Beat 53%
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Amsterdam22 Oct 2022Doubles Open · Women1:25:21 PB90/172Beat 48%
↑ 231 days after Maastricht 2022, with Marrit Van Der Goot 0:17 better than the field Why ↓Close ↑
0:17 better than the field: 3:22 faster on the clock, against 3:05 faster for everyone.
The fieldCompare these two →3:05 faster This pair3:22 faster -
Maastricht5 Mar 2022Doubles Open · Women1:28:4343/63Beat 32%