Bogatova Anna
From Samara, Russia
Common russian riichi rating (CRR)
Rating date Sept. 5, 2025 (latest changes Sept. 5, 2025).
173 place (287.26).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.75 * 1 + 3.50 * 1 + 3.45 * 1) = 14.8
p1 = (151.90 * 3.65 * 0.86 + 785.71 * 2.60 * 1 + 328.57 * 3.50 * 1 + 0 + 0) / (3.65 * 0.86 + 2.60 * 1 + 3.50 * 1 + 1 + 1) = 326.67656120654607
p2 = (785.71 * 2.60 * 1 + 328.57 * 3.50 * 1 + 151.90 * 3.65 * 0.86) / max_coefficients = 247.84189189189183
score = 326.67656120654607 * 0.5 + 247.84189189189183 * 0.5 = 287.25922654921897
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-09-03 | 175 -> 173 | 287.26 | |
| 2025-09-01 | 177 -> 175 | 284.00 -> 287.26 | |
| 2025-08-31 | 173 -> 177 | 284.00 | |
| 2025-08-26 | 175 -> 173 | 284.00 | |
| 2025-08-25 | 179 -> 175 | 284.00 | |
| 2025-08-04 | 179 | 281.52 -> 284.00 |
Riichi over Volga: 100% -> 86% |
| 2025-08-03 | 173 -> 179 | 281.52 | |
| 2025-07-26 | 171 -> 173 | 281.52 | |
| 2025-07-14 | 172 -> 171 | 281.52 | |
| 2025-07-13 | 169 -> 172 | 281.52 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Type | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 329 |
|
48/71 | 100% | 3.50 | RR | Riichi over The Volga 2025 | Samara | |
| 2 | 786 |
|
10/43 | 100% | 2.60 | RR | Riichi On Ice | Samara | |
| 3 | 152 |
|
68/80 | 86% | 3.65 | RR | Riichi over Volga | Samara |