Boiko Bogdan
From Kirov, Russia
Internal rating (RR)
Rating date Nov. 16, 2025 (latest changes Nov. 14, 2025).
66 place (501.06).
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 * 0.71 + 1000 * 3.10 * 1 + 925.37 * 4.10 * 1 + 46.51 * 3 * 1) / (4.60 * 0.43 + 2.80 * 0.57 + 3.65 * 0.71 + 3.10 * 1 + 4.10 * 1 + 3 * 1) = 492.1484796541845
p2 = (925.37 * 4.10 * 1 + 1000 * 3.10 * 1 + 214.95 * 4.60 * 0.43 + 191.49 * 2.80 * 0.57) / max_coefficients = 509.9792642140469
score = 492.1484796541845 * 0.5 + 509.9792642140469 * 0.5 = 501.0638719341157
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-11-14 | 67 -> 66 | 500.04 -> 501.06 |
Guardian of the Winds: 71% -> 57% |
| 2025-11-12 | 68 -> 67 | 499.68 -> 500.04 |
X Russian Championship: 57% -> 43% |
| 2025-11-04 | 65 -> 68 | 511.60 -> 499.68 | |
| 2025-11-01 | 67 -> 65 | 510.65 -> 511.60 | |
| 2025-10-13 | 70 -> 67 | 502.34 -> 510.65 | |
| 2025-10-04 | 70 | 497.10 -> 502.34 |
Riichi over Volga: 86% -> 71% |
| 2025-09-14 | 71 -> 70 | 496.71 -> 497.10 |
Guardian of the Winds: 86% -> 71% |
| 2025-09-12 | 73 -> 71 | 497.28 -> 496.71 |
X Russian Championship: 71% -> 57% |
| 2025-09-03 | 75 -> 73 | 497.28 | |
| 2025-09-01 | 78 -> 75 | 490.11 -> 497.28 |
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 | 114 |
|
71/80 | 71% | 3.65 | RR | Riichi over Volga | Samara | |
| 5 | 191 |
|
39/48 | 57% | 2.80 | RR | Guardian of the Winds | Yekaterinburg | |
| 6 | 215 |
|
85/108 | 43% | 4.60 | RR | X Russian Championship | Perm |