Sai-Cheong (蔡世昌) Choi
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Born : 1976
Cat. M50 Ultrarunner since 2014
8
DUV-index ?Largest integer N such that the runner has at least N credited races of at least N km.
23
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
2
Countries visited ?
United KingdomHong Kong
United KingdomHong Kong22,8%
Rank quotient ?This runner's calculation uses 8 eligible race(s): Σ(rank − 1) = 3 267; Σ finishers = 14 355. 3 267 / 14 355 × 100 = 22.76%. A win adds 0 to the numerator. Lower is better.
Totals
Ultras completed8
Km — ultra races609 km
Longest race100,0 km
36th Oxfam Trailwalker Hong Kong — 17/11/2017
Km per year (ultra races)
2022
2023
2024
2025
2026
Race types (share of distance)
Road37,5%
Trail62,5%
Wins & podiums (ultra)
🏆 Win1
🏆 Win M1
🏅 Top 31
🏅 Top 3 M1
Longest winning streak1
Current streak0
HISTORY
8 race(s)| Date | Race | Perf. | Rk | |
|---|---|---|---|---|
| 2026 | ||||
| 28.02 | 50mi | Chester Ultra 50 |
12:15:10 h | 294 |
| 2018 | ||||
| 28.04 | 6h | 2nd Hong Kong Ultra Marathon Charity Race 6h |
63.000 km | 1 🏆 |
| 04.03 | 6h | 4th Rotary HK Ultra Marathon 6 hours |
65.177 km | 4 |
| 2017 | ||||
| 17.11 | 100km | 36th Oxfam Trailwalker Hong Kong |
19:44:10 h | 281 |
| 05.03 | 50km | 3rd Rotary HK Ultra Marathon 50 km |
4:00:07 h | 8 |
| 2015 | ||||
| 20.11 | 100km | 34th Oxfam Trailwalker Hong Kong |
26:45:40 h | 1487 |
| 01.03 | 50km | 1st Rotary HK Ultra Marathon 50 km |
3:59:29 h | 13 |
| 2014 | ||||
| 14.11 | 100km | 33th Oxfam Trailwalker Hong Kong |
25:58:09 h | 1187 |
| Runner | Races in common |
|---|---|
DUV-index calculation details
| # | Date | Race | Credited km | DUV-index+ |
|---|---|---|---|---|
| ✓ 1 | 17/11/2017 | 36th Oxfam Trailwalker Hong Kong | 100,00 | ×4 |
| ✓ 2 | 20/11/2015 | 34th Oxfam Trailwalker Hong Kong | 100,00 | ×4 |
| ✓ 3 | 14/11/2014 | 33th Oxfam Trailwalker Hong Kong | 100,00 | ×4 |
| ✓ 4 | 28/2/2026 | Chester Ultra 50 | 80,47 | ×3 |
| ✓ 5 | 4/3/2018 | 4th Rotary HK Ultra Marathon 6 hours | 65,18 | ×2 |
| ✓ 6 | 28/4/2018 | 2nd Hong Kong Ultra Marathon Charity Race 6h | 63,00 | ×2 |
| ✓ 7 | 5/3/2017 | 3rd Rotary HK Ultra Marathon 50 km | 50,00 | ×2 |
| ✓ 8 | 1/3/2015 | 1st Rotary HK Ultra Marathon 50 km | 50,00 | ×2 |