Chekan Vikmar
From Saint Petersburg, Russia
EMA: 15990345
Internal rating (RR)
Rating date July 30, 2025 (latest changes July 30, 2025).
205 place (37.79).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.85 * 1 + 3.75 * 1 + 3.65 * 1) = 15.35
p1 = (485.98 * 4 * 0.14 + 21.74 * 2.10 * 0.57 + 21.05 * 3.85 * 1 + 0 + 0) / (4 * 0.14 + 2.10 * 0.57 + 3.85 * 1 + 1 + 1) = 50.50554087494129
p2 = (485.98 * 4 * 0.14 + 21.05 * 3.85 * 1 + 21.74 * 2.10 * 0.57) / max_coefficients = 25.076872964169382
score = 50.50554087494129 * 0.5 + 25.076872964169382 * 0.5 = 37.791206919555336
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 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% |
| 2025-05-12 | 195 | 59.73 -> 60.65 | |
| 2025-05-03 | 187 -> 195 | 80.98 -> 59.73 |
SPB Riichi Open 2023: 43% -> 29% |
| 2025-04-27 | 186 -> 187 | 80.98 |