Obukhova Aleksandra
From Samara, Russia
Common russian riichi rating (CRR)
Rating date Dec. 14, 2025 (latest changes Dec. 13, 2025).
120 place (390.51).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.90 * 1 + 3.50 * 1 + 3.45 * 1) = 14.95
p1 = (438.20 * 3.75 * 0.71 + 685.71 * 3.50 * 1 + 652.17 * 1.60 * 1 + 0 + 0) / (3.75 * 0.71 + 3.50 * 1 + 1.60 * 1 + 1 + 1) = 472.17885950223064
p2 = (685.71 * 3.50 * 1 + 438.20 * 3.75 * 0.71 + 652.17 * 1.60 * 1) / max_coefficients = 308.84682274247496
score = 472.17885950223064 * 0.5 + 308.84682274247496 * 0.5 = 390.5128411223528
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-12-13 | 119 -> 120 | 397.48 -> 390.51 |
Moscow Riichi 2024: 86% -> 71% |
| 2025-12-09 | 120 -> 119 | 397.48 | |
| 2025-12-07 | 117 -> 120 | 397.48 | |
| 2025-11-30 | 116 -> 117 | 397.48 | |
| 2025-11-22 | 144 -> 116 | 323.40 -> 397.48 |
San-Biki Cup: 0% -> 100% |
| 2025-11-19 | 146 -> 144 | 323.40 | |
| 2025-11-14 | 147 -> 146 | 323.40 | |
| 2025-11-12 | 150 -> 147 | 323.40 | |
| 2025-11-04 | 142 -> 150 | 329.19 -> 323.40 | |
| 2025-11-01 | 143 -> 142 | 328.73 -> 329.19 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Rating | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 652 |
|
9/24 | 100% | 1.60 | CRR | San-Biki Cup | Saratov | |
| 2 | 686 |
|
23/71 | 100% | 3.50 | RR | Riichi over The Volga 2025 | Samara | |
| 3 | 438 |
|
51/90 | 71% | 3.75 | RR | Moscow Riichi 2024 | Moscow |