Obukhova Aleksandra
From Samara, Russia
Internal rating (RR)
Rating date July 5, 2026 (latest changes July 3, 2026).
47 place (598.65).
how we calculated rating score
max_coefficients = (4.71 * 1 + 3.90 * 1 + 4.10 * 0.86 + 3.45 * 1) = 15.574109999999997
p1 = (438.20 * 3.75 * 0.29 + 685.71 * 3.50 * 0.71 + 618.18 * 3 * 1 + 888.11 * 4.71 * 1 + 0) / (3.75 * 0.29 + 3.50 * 0.71 + 3 * 1 + 4.71 * 1 + 1) = 669.4141762865465
p2 = (888.11 * 4.71 * 1 + 618.18 * 3 * 1 + 685.71 * 3.50 * 0.71 + 438.20 * 3.75 * 0.29) / max_coefficients = 527.8863447092644
score = 669.4141762865465 * 0.5 + 527.8863447092644 * 0.5 = 598.6502604979055
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2026-07-03 | 46 -> 47 | 609.97 -> 598.65 |
Riichi over The Volga 2025: 86% -> 71% |
| 2026-06-15 | 46 | 600.00 -> 609.97 | |
| 2026-06-14 | 97 -> 46 | 388.99 -> 600.00 |
XII Russian Championship: 0% -> 100% |
| 2026-06-13 | 96 -> 97 | 395.65 -> 388.99 |
Moscow Riichi 2024: 43% -> 29% |
| 2026-06-04 | 97 -> 96 | 395.65 | |
| 2026-05-17 | 96 -> 97 | 395.65 | |
| 2026-05-14 | 97 -> 96 | 395.65 | |
| 2026-05-12 | 98 -> 97 | 395.65 | |
| 2026-05-03 | 92 -> 98 | 411.16 -> 395.65 |
Riichi over The Volga 2025: 100% -> 86% |
| 2026-05-02 | 93 -> 92 | 411.16 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Rating | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 888 |
|
17/144 | 100% | 4.71 | RR | XII Russian Championship | Samara | |
| 2 | 618 |
|
22/56 | 100% | 3.00 | RR | Riichi On Ice 2026 | Samara | |
| 3 | 686 |
|
23/71 | 71% | 3.50 | RR | Riichi over The Volga 2025 | Samara | |
| 4 | 438 |
|
51/90 | 29% | 3.75 | RR | Moscow Riichi 2024 | Moscow |