Boiko Bogdan
From Kirov, Russia
Common russian riichi rating (CRR)
Rating date Sept. 13, 2025 (latest changes Sept. 12, 2025).
71 place (529.04).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.75 * 1 + 3.50 * 1 + 3.45 * 1) = 14.8
p1 = (214.95 * 4.60 * 0.57 + 191.49 * 2.80 * 0.86 + 113.92 * 3.65 * 0.86 + 736.84 * 1.50 * 1 + 1000 * 3.10 * 1 + 925.37 * 4.10 * 1 + 46.51 * 3 * 1) / (4.60 * 0.57 + 2.80 * 0.86 + 3.65 * 0.86 + 1.50 * 1 + 3.10 * 1 + 4.10 * 1 + 3 * 1) = 479.4222212261986
p2 = (925.37 * 4.10 * 1 + 1000 * 3.10 * 1 + 736.84 * 1.50 * 1 + 214.95 * 4.60 * 0.57) / max_coefficients = 578.6675675675676
score = 479.4222212261986 * 0.5 + 578.6675675675676 * 0.5 = 529.0448943968831
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-09-12 | 72 -> 71 | 529.58 -> 529.04 |
X Russian Championship: 71% -> 57% |
| 2025-09-05 | 71 -> 72 | 529.58 | |
| 2025-09-03 | 72 -> 71 | 529.58 | |
| 2025-09-01 | 74 -> 72 | 521.84 -> 529.58 | |
| 2025-08-31 | 67 -> 74 | 521.84 | |
| 2025-08-26 | 68 -> 67 | 521.84 | |
| 2025-08-09 | 69 -> 68 | 521.84 | |
| 2025-08-04 | 69 | 514.62 -> 521.84 |
Riichi over Volga: 100% -> 86% |
| 2025-08-03 | 62 -> 69 | 549.18 -> 514.62 |
Two roosters and Chuckles: 0% -> 100% |
| 2025-07-30 | 63 -> 62 | 549.18 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Type | 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 | 86% | 3.65 | RR | Riichi over Volga | Samara | |
| 6 | 191 |
|
39/48 | 86% | 2.80 | RR | Guardian of the Winds | Yekaterinburg | |
| 7 | 215 |
|
85/108 | 57% | 4.60 | RR | X Russian Championship | Perm |