Bogatova Anna
From Samara, Russia
Common russian riichi rating (CRR)
Rating date Dec. 10, 2025 (latest changes Dec. 9, 2025).
145 place (341.15).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.90 * 1 + 3.50 * 1 + 3.45 * 1) = 14.95
p1 = (151.90 * 3.65 * 0.57 + 785.71 * 2.60 * 1 + 328.57 * 3.50 * 1 + 478.26 * 1.60 * 1 + 0) / (3.65 * 0.57 + 2.60 * 1 + 3.50 * 1 + 1.60 * 1 + 1) = 396.35032232761984
p2 = (785.71 * 2.60 * 1 + 328.57 * 3.50 * 1 + 478.26 * 1.60 * 1 + 151.90 * 3.65 * 0.57) / max_coefficients = 285.9451505016723
score = 396.35032232761984 * 0.5 + 285.9451505016723 * 0.5 = 341.14773641464603
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-12-07 | 139 -> 145 | 341.15 | |
| 2025-12-06 | 137 -> 139 | 341.15 | |
| 2025-12-04 | 139 -> 137 | 338.16 -> 341.15 |
Riichi over Volga: 71% -> 57% |
| 2025-12-01 | 140 -> 139 | 338.16 | |
| 2025-11-25 | 141 -> 140 | 338.16 | |
| 2025-11-22 | 164 -> 141 | 287.62 -> 338.16 |
San-Biki Cup: 0% -> 100% |
| 2025-11-15 | 165 -> 164 | 287.62 | |
| 2025-11-12 | 167 -> 165 | 287.62 | |
| 2025-11-10 | 168 -> 167 | 287.62 | |
| 2025-11-04 | 164 -> 168 | 293.08 -> 287.62 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Rating | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 478 |
|
13/24 | 100% | 1.60 | CRR | San-Biki Cup | Saratov | |
| 2 | 329 |
|
48/71 | 100% | 3.50 | RR | Riichi over The Volga 2025 | Samara | |
| 3 | 786 |
|
10/43 | 100% | 2.60 | RR | Riichi On Ice | Samara | |
| 4 | 152 |
|
68/80 | 57% | 3.65 | RR | Riichi over Volga | Samara |