Yuki (石原裕貴) Ishihara
External sources
Loading FFA
Loading MV
FFA diagnostics
Run “Search / refresh FFA” to see each season, HTTP response, candidate and DUV comparison.
MarathonView diagnostics
Run “Refresh MV” to see login, session validation and parser status.
Cached locally. Empty refreshes never erase the last valid snapshot.
Born : 1990
Cat. M35 Ultrarunner since 2022
18
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
42
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
Japan26,3%
Rank quotient ?This runner's calculation uses 18 eligible race(s): Σ(rank − 1) = 1 949; Σ finishers = 7 406. 1 949 / 7 406 × 100 = 26.32%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed18
Km — ultra races2 257 km
> 100 km11
> 160 km9
> 24h1
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)
Road8,9%
Trail86,7%
Elim.4,5%
HISTORY
18 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 | ×3 |
| ✓ 2 | 21/4/2023 | 8th Ultra-Trail Mt. Fuji (UTMF) | 167,00 | ×3 |
| ✓ 3 | 27/6/2025 | 4th Deep Japan Ultra 100 - 165 km | 165,00 | ×3 |
| ✓ 4 | 14/9/2024 | 16th Shinetsu Five Mountains Trail 100 mile | 163,10 | ×3 |
| ✓ 5 | 16/9/2023 | 15th Shinetsu Five Mountains Trail 100 mile | 162,60 | ×3 |
| ✓ 6 | 13/9/2025 | 17th Shinetsu Five Mountains Trail 100 mile | 162,20 | ×3 |
| ✓ 7 | 12/10/2025 | 11th OSJ Koumi 100 | 160,93 | ×3 |
| ✓ 8 | 12/10/2024 | 10th OSJ Koumi 100 | 160,93 | ×3 |
| ✓ 9 | 8/10/2022 | 8th OSJ Koumi 100 | 160,93 | ×3 |
| ✓ 10 | 16/7/2023 | 15th OSJ Ontake 100km Ultra Trail | 109,20 | ×2 |
| ✓ 11 | 19/11/2022 | 3rd Last Samurai Standing Backyard Ultra - Tokyo | 100,59 | ×2 |
| ✓ 12 | 13/4/2025 | 10th Tamagawa Ultra Marathon - 100 km | 100,00 | ×2 |
| ✓ 13 | 6/7/2024 | 2nd Shiga Kogen 100 | 100,00 | ×2 |
| ✓ 14 | 15/10/2023 | 29th River Shimanto 100km | 100,00 | ×2 |
| ✓ 15 | 2/7/2022 | 12th Utsukushigahara 85 km Trail Run | 85,00 | ×2 |
| ✓ 16 | 1/11/2025 | 5th Manno Mountain Madness 2025 | 80,00 | ×1 |
| ✓ 17 | 5/11/2023 | 7th Koshu Alps Haute Route Challenge | 68,00 | ×1 |
| ✓ 18 | 27/5/2022 | 1st Karuizawa Trail Running Race | 45,00 | ×1 |