Koichi (大久保孝一) Okubo
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Born : 1944
Cat. M80 Ultrarunner since 1990
10
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
41
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
3
Countries visited ?
GreeceJapan
South Africa
GreeceJapanSouth Africa89,9%
Rank quotient ?This runner's calculation uses 10 eligible race(s): Σ(rank − 1) = 18 378; Σ finishers = 20 450. 18 378 / 20 450 × 100 = 89.87%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed10
Km — ultra races2 003 km
> 100 km7
> 160 km7
> 200 km7
Longest race250,0 km
3. Sakura Michi Kokusai Nature Run — 20/4/1996
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road13,8%
Trail86,2%
Records
HISTORY
10 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2002 | ||||
| 17.06 | 87km road race | 77th Comrades Marathon - Up Run |
10:43:23 h | 7223 |
| 2001 | ||||
| 16.06 | 89km road race | 76th Comrades Marathon - Down Run |
10:58:41 h | 10930 |
| 1997 | ||||
| 26.09 | 245.3km | 15. Spartathlon |
35:50:00 h | 68 |
| 1996 | ||||
| 27.09 | 245.3km | 14. Spartathlon |
35:12:00 h | 45 |
| 20.04 | 250km | 3. Sakura Michi Kokusai Nature Run |
33:28:00 h | 17 |
| 1995 | ||||
| 29.09 | 245.3km | 13. Spartathlon |
33:15:30 h | 25 |
| 1994 | ||||
| 23.09 | 245.3km | 12. Spartathlon |
35:46:00 h | 38 |
| 23.04 | 250km | 1. Sakura Michi Kokusai Nature Run |
31:52:00 h | 5 |
| 1993 | ||||
| 24.09 | 245.3km | 11. Spartathlon |
34:47:37 h | 32 |
| 1990 | ||||
| 23.09 | 100km | 2. Akita Nairiku 100km Marathon |
8:21:16 h | 5 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 20/4/1996 | 3. Sakura Michi Kokusai Nature Run | 250,00 | ×6 |
| ✓ 2 | 23/4/1994 | 1. Sakura Michi Kokusai Nature Run | 250,00 | ×6 |
| ✓ 3 | 26/9/1997 | 15. Spartathlon | 245,30 | ×5 |
| ✓ 4 | 27/9/1996 | 14. Spartathlon | 245,30 | ×5 |
| ✓ 5 | 29/9/1995 | 13. Spartathlon | 245,30 | ×5 |
| ✓ 6 | 23/9/1994 | 12. Spartathlon | 245,30 | ×5 |
| ✓ 7 | 24/9/1993 | 11. Spartathlon | 245,30 | ×5 |
| ✓ 8 | 23/9/1990 | 2. Akita Nairiku 100km Marathon | 100,00 | ×2 |
| ✓ 9 | 16/6/2001 | 76th Comrades Marathon - Down Run (RSA) | 89,00 | ×2 |
| ✓ 10 | 17/6/2002 | 77th Comrades Marathon - Up Run (RSA) | 87,00 | ×2 |