Obukhova Aleksandra
From Samara, Russia
Internal rating (RR)
Rating date Aug. 5, 2025 (latest changes Aug. 4, 2025).
132 place (330.23).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.85 * 1 + 3.75 * 1 + 3.50 * 1) = 15.2
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 = 266.00394736842105
score = 394.46439024390247 * 0.5 + 266.00394736842105 * 0.5 = 330.23416880616173
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 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 | |
| 2025-05-10 | 127 -> 125 | 324.78 | |
| 2025-05-03 | 127 | 324.78 |
Riichi over The Volga 2025: 0% -> 100% |
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 |