Jui-Chi (Ricky) (宋睿啟) Sung
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17
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
34
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
10
Countries visited ?
China
France
Hong Kong
Japan
South Korea
Slovenia
Switzerland
Thailand
Taiwan
Vietnam
5,5%
Rank quotient ?This runner's calculation uses 17 eligible race(s): Σ(rank − 1) = 765; Σ finishers = 13 797. 765 / 13 797 × 100 = 5.54%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed17
Km — ultra races1 419 km
> 100 km4
> 160 km1
Longest race174,0 km
22ème Ultra Trail Tour du Mont Blanc (UTMB) — 29/8/2025
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Trail100,0%
Wins & podiums (ultra)
🏆 Win1
🏆 Win M1
🏅 Top 31
🏅 Top 3 M1
Longest winning streak1
Current streak0
Records
HISTORY
17 race(s)| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 29/8/2025 | 22ème Ultra Trail Tour du Mont Blanc (UTMB) | 174,00 | ×5 |
| ✓ 2 | 20/9/2024 | Julian Alps Trail Run by UTMB - Ultra Trail 120K | 120,00 | ×3 |
| ✓ 3 | 9/5/2026 | 4th Aso Volcano Trail | 114,00 | ×3 |
| ✓ 4 | 16/5/2025 | 1st Ultra-Trail Great Wall by UTMB - 100K | 103,70 | ×3 |
| ✓ 5 | 7/10/2023 | 10th TransJeju by UTMB 100 | 100,00 | ×2 |
| ✓ 6 | 9/12/2023 | 4th Doi Inthanon Thailand by UTMB - ELEPHANT 100 | 96,50 | ×2 |
| ✓ 7 | 7/12/2024 | 1st Chiangmai Thailand by UTMB - ELEPHANT 100 | 93,00 | ×2 |
| ✓ 8 | 19/11/2022 | 6th Formosa Trail 75km | 75,00 | ×2 |
| ✓ 9 | 31/1/2026 | 8th Vietnam Trail Marathon | 70,00 | ×2 |
| ✓ 10 | 14/12/2025 | 12th Izu Trail Journey | 70,00 | ×2 |
| ✓ 11 | 26/4/2025 | 4th KAI 70k | 70,00 | ×2 |
| ✓ 12 | 14/9/2024 | 2nd Wildstrubel by UTMB - 70K | 70,00 | ×2 |
| ✓ 13 | 19/10/2024 | 10th Ninghai Ultra Trail - 50km | 60,00 | ×1 |
| ✓ 14 | 7/3/2026 | 1st Xtrail Kenting by UTMB - Xtrail 50K | 52,00 | ×1 |
| ✓ 15 | 6/11/2022 | 9th TransLantau 50 by UTMB | 51,00 | ×1 |
| ✓ 16 | 1/11/2025 | 10th Ultimate Tsaigu Trail Kuocang - 50 km | 50,00 | ×1 |
| ✓ 17 | 6/7/2024 | 8th Minami-aso caldera Trail Summer | 50,00 | ×1 |