Chekan Vikmar
From Saint Petersburg, Russia
EMA: 15990345
Common russian riichi rating (CRR)
Rating date Oct. 18, 2025 (latest changes Oct. 13, 2025).
286 place (7.72).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.50 * 1 + 3.45 * 1 + 3.85 * 0.86) = 14.349835
p1 = (21.74 * 2.10 * 0.43 + 21.05 * 3.85 * 0.86 + 0 * 3.45 * 1 + 0 + 0) / (2.10 * 0.43 + 3.85 * 0.86 + 3.45 * 1 + 1 + 1) = 9.227043403062932
p2 = (21.05 * 3.85 * 0.86 + 21.74 * 2.10 * 0.43 + 0 * 3.45 * 1) / max_coefficients = 6.204949394888512
score = 9.227043403062932 * 0.5 + 6.204949394888512 * 0.5 = 7.715996398975722
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-10-13 | 286 | 7.62 -> 7.72 | |
| 2025-09-30 | 286 | 8.03 -> 7.62 |
Seihoku spring tournament 2024: 57% -> 43% |
| 2025-09-03 | 294 -> 286 | 32.22 -> 8.03 |
SPB Riichi Open 2023: 14% -> 0% |
| 2025-09-01 | 294 | 31.77 -> 32.22 |
SPB Riichi Open 2024: 100% -> 86% |
| 2025-08-31 | 286 -> 294 | 37.91 -> 31.77 |
SPB Riichi Open 2025: 0% -> 100% |
| 2025-08-26 | 287 -> 286 | 37.91 | |
| 2025-08-25 | 288 -> 287 | 37.91 | |
| 2025-08-04 | 288 | 37.79 -> 37.91 | |
| 2025-08-03 | 283 -> 288 | 37.79 | |
| 2025-08-02 | 282 -> 283 | 37.79 |