Chekan Vikmar
From Saint Petersburg, Russia
EMA: 15990345
Common russian riichi rating (CRR)
Rating date Dec. 8, 2025 (latest changes Dec. 4, 2025).
288 place (6.40).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.90 * 1 + 3.50 * 1 + 3.45 * 1) = 14.95
p1 = (21.74 * 2.10 * 0.29 + 21.05 * 3.85 * 0.71 + 0 * 3.45 * 1 + 0 + 0) / (2.10 * 0.29 + 3.85 * 0.71 + 3.45 * 1 + 1 + 1) = 8.061340734827457
p2 = (21.05 * 3.85 * 0.71 + 21.74 * 2.10 * 0.29 + 0 * 3.45 * 1) / max_coefficients = 4.745150501672241
score = 8.061340734827457 * 0.5 + 4.745150501672241 * 0.5 = 6.40324561824985
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-11-30 | 287 -> 288 | 6.85 -> 6.40 |
Seihoku spring tournament 2024: 43% -> 29% |
| 2025-11-25 | 288 -> 287 | 6.85 | |
| 2025-11-04 | 284 -> 288 | 6.97 -> 6.85 | |
| 2025-11-01 | 284 | 7.72 -> 6.97 |
SPB Riichi Open 2024: 86% -> 71% |
| 2025-10-22 | 286 -> 284 | 7.72 | |
| 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% |