Chekan Vikmar
From Saint Petersburg, Russia
EMA: 15990345
Internal rating (RR)
Rating date Sept. 10, 2025 (latest changes Sept. 10, 2025).
217 place (8.03).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.75 * 1 + 3.50 * 1 + 3.45 * 1) = 14.8
p1 = (21.74 * 2.10 * 0.57 + 21.05 * 3.85 * 0.86 + 0 * 3.45 * 1 + 0 + 0) / (2.10 * 0.57 + 3.85 * 0.86 + 3.45 * 1 + 1 + 1) = 9.604237281747578
p2 = (21.05 * 3.85 * 0.86 + 21.74 * 2.10 * 0.57 + 0 * 3.45 * 1) / max_coefficients = 6.456756756756756
score = 9.604237281747578 * 0.5 + 6.456756756756756 * 0.5 = 8.030497019252167
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-09-03 | 223 -> 217 | 32.22 -> 8.03 |
SPB Riichi Open 2023: 14% -> 0% |
| 2025-09-01 | 223 | 31.77 -> 32.22 |
SPB Riichi Open 2024: 100% -> 86% |
| 2025-08-31 | 213 -> 223 | 37.91 -> 31.77 |
SPB Riichi Open 2025: 0% -> 100% |
| 2025-08-04 | 213 | 37.79 -> 37.91 | |
| 2025-08-03 | 206 -> 213 | 37.79 | |
| 2025-07-30 | 206 | 37.46 -> 37.79 |
Seihoku spring tournament 2024: 71% -> 57% |
| 2025-07-13 | 202 -> 206 | 37.46 | |
| 2025-07-12 | 202 | 37.22 -> 37.46 | |
| 2025-07-03 | 199 -> 202 | 60.77 -> 37.22 |
SPB Riichi Open 2023: 29% -> 14% |
| 2025-06-15 | 186 -> 199 | 61.41 -> 60.77 |