Chekan Vikmar
From Saint Petersburg, Russia
EMA: 15990345
Internal rating (RR)
Rating date Aug. 31, 2025 (latest changes Aug. 31, 2025).
222 place (31.77).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.85 * 1 + 3.75 * 1 + 3.50 * 1) = 15.2
p1 = (485.98 * 4 * 0.14 + 21.74 * 2.10 * 0.57 + 21.05 * 3.85 * 1 + 0 * 3.45 * 1 + 0) / (4 * 0.14 + 2.10 * 0.57 + 3.85 * 1 + 3.45 * 1 + 1) = 38.21957714510393
p2 = (485.98 * 4 * 0.14 + 21.05 * 3.85 * 1 + 21.74 * 2.10 * 0.57 + 0 * 3.45 * 1) / max_coefficients = 25.32434210526316
score = 38.21957714510393 * 0.5 + 25.32434210526316 * 0.5 = 31.77195962518355
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-08-31 | 212 -> 222 | 37.91 -> 31.77 |
SPB Riichi Open 2025: 0% -> 100% |
| 2025-08-04 | 212 | 37.79 -> 37.91 | |
| 2025-08-03 | 205 -> 212 | 37.79 | |
| 2025-07-30 | 205 | 37.46 -> 37.79 |
Seihoku spring tournament 2024: 71% -> 57% |
| 2025-07-13 | 201 -> 205 | 37.46 | |
| 2025-07-12 | 201 | 37.22 -> 37.46 | |
| 2025-07-03 | 198 -> 201 | 60.77 -> 37.22 |
SPB Riichi Open 2023: 29% -> 14% |
| 2025-06-15 | 185 -> 198 | 61.41 -> 60.77 | |
| 2025-06-11 | 195 -> 185 | 61.41 | |
| 2025-05-30 | 195 | 60.65 -> 61.41 |
Seihoku spring tournament 2024: 86% -> 71% |