Obukhova Aleksandra
From Samara, Russia
Internal rating (RR)
Rating date Dec. 14, 2025 (latest changes Dec. 13, 2025).
131 place (314.20).
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 + 0 + 0 + 0) / (3.75 * 0.71 + 3.50 * 1 + 1 + 1 + 1) = 389.3589726130003
p2 = (685.71 * 3.50 * 1 + 438.20 * 3.75 * 0.71) / max_coefficients = 239.04882943143812
score = 389.3589726130003 * 0.5 + 239.04882943143812 * 0.5 = 314.2039010222192
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-12-13 | 127 -> 131 | 323.40 -> 314.20 |
Moscow Riichi 2024: 86% -> 71% |
| 2025-12-07 | 125 -> 127 | 323.40 | |
| 2025-12-04 | 126 -> 125 | 323.40 | |
| 2025-11-30 | 125 -> 126 | 323.40 | |
| 2025-11-14 | 126 -> 125 | 323.40 | |
| 2025-11-12 | 130 -> 126 | 323.40 | |
| 2025-11-10 | 131 -> 130 | 323.40 | |
| 2025-11-04 | 125 -> 131 | 329.19 -> 323.40 | |
| 2025-11-01 | 125 | 328.73 -> 329.19 | |
| 2025-10-13 | 121 -> 125 | 333.83 -> 328.73 |
Moscow Riichi 2024: 100% -> 86% |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Rating | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 686 |
|
23/71 | 100% | 3.50 | RR | Riichi over The Volga 2025 | Samara | |
| 2 | 438 |
|
51/90 | 71% | 3.75 | RR | Moscow Riichi 2024 | Moscow |