Obukhova Aleksandra
From Samara, Russia
Common russian riichi rating (CRR)
Rating date July 12, 2025 (latest changes July 12, 2025).
143 place (328.93).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.85 * 1 + 3.75 * 1 + 3.65 * 1) = 15.35
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 = 263.4045602605863
score = 394.46439024390247 * 0.5 + 263.4045602605863 * 0.5 = 328.9344752522444
Rating changes
Date | Place | Points | Reason |
---|---|---|---|
2025-07-12 | 144 -> 143 | 326.47 -> 328.93 | |
2025-07-10 | 146 -> 144 | 326.47 | |
2025-06-15 | 143 -> 146 | 330.30 -> 326.47 | |
2025-06-14 | 142 -> 143 | 330.30 | |
2025-06-11 | 144 -> 142 | 330.30 | |
2025-06-09 | 145 -> 144 | 330.30 | |
2025-06-08 | 144 -> 145 | 330.30 | |
2025-05-25 | 145 -> 144 | 330.30 | |
2025-05-17 | 143 -> 145 | 330.30 | |
2025-05-12 | 144 -> 143 | 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 |