Obukhova Aleksandra
From Samara, Russia
Internal rating (RR)
Rating date Sept. 5, 2025 (latest changes Sept. 3, 2025).
126 place (333.83).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.75 * 1 + 3.50 * 1 + 3.45 * 1) = 14.8
p1 = (438.20 * 3.75 * 1 + 685.71 * 3.50 * 1 + 0 + 0 + 0) / (3.75 * 1 + 3.50 * 1 + 1 + 1 + 1) = 394.46439024390247
p2 = (685.71 * 3.50 * 1 + 438.20 * 3.75 * 1) / max_coefficients = 273.1932432432432
score = 394.46439024390247 * 0.5 + 273.1932432432432 * 0.5 = 333.8288167435728
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-09-03 | 130 -> 126 | 333.83 | |
| 2025-09-01 | 131 -> 130 | 330.23 -> 333.83 | |
| 2025-08-09 | 132 -> 131 | 330.23 | |
| 2025-08-04 | 132 | 328.93 -> 330.23 | |
| 2025-08-03 | 129 -> 132 | 328.93 | |
| 2025-07-13 | 125 -> 129 | 328.93 | |
| 2025-07-12 | 124 -> 125 | 326.47 -> 328.93 | |
| 2025-06-15 | 119 -> 124 | 330.30 -> 326.47 | |
| 2025-06-11 | 122 -> 119 | 330.30 | |
| 2025-05-12 | 125 -> 122 | 324.78 -> 330.30 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Type | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 686 |
|
23/71 | 100% | 3.50 | RR | Riichi over The Volga 2025 | Samara | |
| 2 | 438 |
|
51/90 | 100% | 3.75 | RR | Moscow Riichi 2024 | Moscow |