Obukhova Aleksandra
From Samara, Russia
Internal rating (RR)
Rating date May 5, 2026 (latest changes May 3, 2026).
98 place (395.65).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.90 * 1 + 3.45 * 1 + 3.40 * 1) = 14.85
p1 = (438.20 * 3.75 * 0.43 + 685.71 * 3.50 * 0.86 + 618.18 * 3 * 1 + 0 + 0) / (3.75 * 0.43 + 3.50 * 0.86 + 3 * 1 + 1 + 1) = 480.46652996221553
p2 = (685.71 * 3.50 * 0.86 + 618.18 * 3 * 1 + 438.20 * 3.75 * 0.43) / max_coefficients = 310.83434343434345
score = 480.46652996221553 * 0.5 + 310.83434343434345 * 0.5 = 395.65043669827946
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2026-05-03 | 92 -> 98 | 411.16 -> 395.65 |
Riichi over The Volga 2025: 100% -> 86% |
| 2026-05-02 | 93 -> 92 | 411.16 | |
| 2026-04-27 | 94 -> 93 | 411.16 | |
| 2026-04-19 | 93 -> 94 | 411.16 | |
| 2026-04-16 | 92 -> 93 | 411.16 | |
| 2026-04-13 | 90 -> 92 | 417.69 -> 411.16 |
Moscow Riichi 2024: 57% -> 43% |
| 2026-04-05 | 91 -> 90 | 417.69 | |
| 2026-04-04 | 93 -> 91 | 417.69 | |
| 2026-03-14 | 94 -> 93 | 417.69 | |
| 2026-03-12 | 96 -> 94 | 417.69 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Rating | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 618 |
|
22/56 | 100% | 3.00 | RR | Riichi On Ice 2026 | Samara | |
| 2 | 686 |
|
23/71 | 86% | 3.50 | RR | Riichi over The Volga 2025 | Samara | |
| 3 | 438 |
|
51/90 | 43% | 3.75 | RR | Moscow Riichi 2024 | Moscow |