Yasushi (小林靖) Kobayashi
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16
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
32
DUV-index+ ?Largest integer N such that the race distances provide at least N complete segments of N km in total. A single long race may therefore contribute several segments. See the DUV-Index tab for the detailed calculation. calculation details
1
Countries visited ?
Japan
89,2%
Rank quotient ?This runner's calculation uses 16 eligible race(s): Σ(rank − 1) = 9 276; Σ finishers = 10 400. 9 276 / 10 400 × 100 = 89.19%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed16
Km — ultra races1 255 km
> 100 km2
> 160 km1
Longest race167,0 km
11th Ultra-Trail Mt. Fuji (UTMF) — 24/4/2026
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road20,1%
Trail79,9%
Records
HISTORY
16 race(s)| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 24/4/2026 | 11th Ultra-Trail Mt. Fuji (UTMF) | 167,00 | ×5 |
| ✓ 2 | 16/7/2023 | 15th OSJ Ontake 100km Ultra Trail | 109,20 | ×3 |
| ✓ 3 | 12/3/2023 | 5th Ibaraki 100k Ultra Marathon | 100,00 | ×3 |
| ✓ 4 | 24/3/2019 | 1st Ibaraki 100k Ultra Marathon | 100,00 | ×3 |
| ✓ 5 | 25/10/2025 | 5. Jungle Guruguru Max - 80 km | 80,00 | ×2 |
| ✓ 6 | 12/10/2025 | 33th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 7 | 13/10/2024 | 32th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 8 | 8/10/2023 | 31th Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 9 | 31/10/2015 | 23rd Hasetsune Cup - Japan Mountain Endurance Race | 71,50 | ×2 |
| ✓ 10 | 14/7/2024 | 15th Nozawa Onsen 4100D Mountain Trail Pair | 65,00 | ×2 |
| ✓ 11 | 17/7/2022 | 13th Nozawa Onsen 4100D Mountain Trail Pair | 65,00 | ×2 |
| ✓ 12 | 14/7/2018 | 9th Nozawa Onsen 4100D Mountain Trail Pair | 65,00 | ×2 |
| ✓ 13 | 15/7/2017 | 8th Nozawa Onsen 4100D Mountain Trail Pair | 65,00 | ×2 |
| ✓ 14 | 13/9/2015 | 5th Hakuba Int. Trail Run | 53,00 | ×1 |
| ✓ 15 | 6/4/2014 | 65. Tsurunuma 52 km | 52,00 | ×1 |
| ✓ 16 | 30/8/2015 | 2nd Tsukuba Renjyo 48 km Road & Trail Run | 48,00 | ×1 |