Progress against the field
Shanna Achterberg has gained 1:27 on the field from Rotterdam 2025 to Maastricht 2026.
The clock says 13:44 faster, but the races themselves got 12:17 quicker for everyone.
The biggest step was Maastricht 2025 → Utrecht 2025: 4:59 on the field in 70 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. The summary above covers Individual Open · Women, the one raced most; every comparison is in the list below.
Every race
10 races · 10 events
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Maastricht19 Sep 2026Individual Open · Women1:14:1511/295Beat 96%
↑ 128 days after Heerenveen 2026 0:18 better than the field Slower on the clock, ahead of the field Why ↓Close ↑
1:19 slower on the clock, but the race was 1:37 slower for everyone, so this was 0:18 better than the field.
The fieldCompare these two →1:37 slower This athlete1:19 slower -
Heerenveen14 May 2026Individual Open · Women1:12:5613/427Beat 97%
↑ 49 days after Mechelen 2026 0:14 worse than the field Faster on the clock, behind the field Why ↓Close ↑
0:42 faster on the clock, yet the race was 0:56 faster for everyone, so 0:14 was lost on the field.
The fieldCompare these two →0:56 faster This athlete0:42 faster -
Malaga16 Apr 2026Doubles Open · Mixed1:09:26 PB94/546Beat 83%
↑ 140 days after Madrid 2025, with Patrick Pijnaker 1:42 better than the field Why ↓Close ↑
6:49 faster on the clock, and the race was 5:07 faster for everyone, so 1:42 of it was this pair.
The fieldCompare these two →5:07 faster This pair6:49 faster -
Mechelen26 Mar 2026Individual Open · Women1:13:3813/169Beat 92%
↑ 64 days after Amsterdam 2026 2:30 worse than the field Why ↓Close ↑
2:30 behind the field: 1:12 slower on the clock, against 1:18 faster for everyone.
The fieldCompare these two →1:18 faster This athlete1:12 slower -
Amsterdam21 Jan 2026Individual Open · Women1:12:26 PB8/287Beat 97%
↑ 54 days after Utrecht 2025 2:04 worse than the field Faster on the clock, behind the field Why ↓Close ↑
3:20 faster on the clock looks better than it was: the race was 5:24 faster for everyone, which leaves this 2:04 behind the field.
The fieldCompare these two →5:24 faster This athlete3:20 faster -
Utrecht28 Nov 2025Individual Open · Women1:15:4633/619Beat 95%
↑ 70 days after Maastricht 2025 4:59 better than the field Why ↓Close ↑
4:59 better than the field: 7:49 faster on the clock, against 2:50 faster for everyone.
The fieldCompare these two →2:50 faster This athlete7:49 faster -
Madrid27 Nov 2025Doubles Open · Mixed1:16:15226/789Beat 71%
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Maastricht19 Sep 2025Individual Open · Women1:23:3552/348Beat 85%
↑ 133 days after Heerenveen 2025 2:06 worse than the field Why ↓Close ↑
1:02 slower on the clock in a race that was 1:04 faster for everyone: 2:06 lost to the field.
The fieldCompare these two →1:04 faster This athlete1:02 slower -
Heerenveen9 May 2025Individual Open · Women1:22:3344/183Beat 76%
↑ 71 days after Rotterdam 2025 3:04 better than the field Why ↓Close ↑
3:04 better than the field: 5:26 faster on the clock, against 2:22 faster for everyone.
The fieldCompare these two →2:22 faster This athlete5:26 faster -
Rotterdam27 Feb 2025Individual Open · Women1:27:5962/203Beat 70%