Boiko Bogdan
From Kirov, Russia
Common russian riichi rating (CRR)
Rating date Dec. 6, 2025 (latest changes Dec. 4, 2025).
56 place (544.04).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.90 * 1 + 3.50 * 1 + 3.45 * 1) = 14.95
p1 = (214.95 * 4.60 * 0.43 + 191.49 * 2.80 * 0.57 + 113.92 * 3.65 * 0.57 + 736.84 * 1.50 * 1 + 1000 * 3.10 * 1 + 925.37 * 4.10 * 1 + 46.51 * 3 * 1) / (4.60 * 0.43 + 2.80 * 0.57 + 3.65 * 0.57 + 1.50 * 1 + 3.10 * 1 + 4.10 * 1 + 3 * 1) = 524.6605277728007
p2 = (925.37 * 4.10 * 1 + 1000 * 3.10 * 1 + 736.84 * 1.50 * 1 + 214.95 * 4.60 * 0.43) / max_coefficients = 563.4167224080269
score = 524.6605277728007 * 0.5 + 563.4167224080269 * 0.5 = 544.0386250904138
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-12-04 | 61 -> 56 | 538.05 -> 544.04 |
Riichi over Volga: 71% -> 57% |
| 2025-11-30 | 59 -> 61 | 538.05 | |
| 2025-11-22 | 58 -> 59 | 538.05 | |
| 2025-11-19 | 59 -> 58 | 538.05 | |
| 2025-11-15 | 60 -> 59 | 538.05 | |
| 2025-11-14 | 63 -> 60 | 534.53 -> 538.05 |
Guardian of the Winds: 71% -> 57% |
| 2025-11-12 | 65 -> 63 | 534.21 -> 534.53 |
X Russian Championship: 57% -> 43% |
| 2025-11-04 | 61 -> 65 | 547.23 -> 534.21 | |
| 2025-11-01 | 62 -> 61 | 546.19 -> 547.23 | |
| 2025-10-25 | 63 -> 62 | 546.19 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Rating | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 47 |
|
42/44 | 100% | 3.00 | RR | Two roosters and Chuckles | Kirov | |
| 2 | 925 |
|
6/68 | 100% | 4.10 | RR | 13 bloody tiles | Perm | |
| 3 | 1000 |
|
🥇 | 1/32 | 100% | 3.10 | RR | Moscow Open Riichi Marathon | Moscow |
| 4 | 737 |
|
6/20 | 100% | 1.50 | CRR | Dirty Riichi | Kirov | |
| 5 | 114 |
|
71/80 | 57% | 3.65 | RR | Riichi over Volga | Samara | |
| 6 | 191 |
|
39/48 | 57% | 2.80 | RR | Guardian of the Winds | Yekaterinburg | |
| 7 | 215 |
|
85/108 | 43% | 4.60 | RR | X Russian Championship | Perm |