Koichi (臼井晃一) Usui
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 : 1961
Cat. M65 Ultrarunner since 2014
21
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
36
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
Japan65,5%
Rank quotient ?This runner's calculation uses 21 eligible race(s): Σ(rank − 1) = 10 600; Σ finishers = 16 179. 10 600 / 16 179 × 100 = 65.52%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed21
Km — ultra races1 756 km
> 100 km5
> 160 km2
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)
Road28,9%
Trail71,1%
Records
HISTORY
21 race(s)| Runner | Races in common |
|---|---|