Youji (久保井洋次) Kuboi
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 : 1955
Cat. M70 Ultrarunner since 1999
23
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
Japan44,3%
Rank quotient ?This runner's calculation uses 23 eligible race(s): Σ(rank − 1) = 4 398; Σ finishers = 9 927. 4 398 / 9 927 × 100 = 44.30%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed23
Km — ultra races1 905 km
Longest race100,0 km
15th Muraoka 100 km Ultra Marathon — 30/9/2012
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road94,8%
Trail5,2%
Records
HISTORY
23 race(s)| Runner | Races in common |
|---|---|