Boiko Bogdan
From Kirov, Russia
Internal rating (RR)
Rating date Jan. 22, 2026 (latest changes Jan. 14, 2026).
68 place (488.79).
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 * 0.29 + 191.49 * 2.80 * 0.43 + 113.92 * 3.65 * 0.57 + 1000 * 3.10 * 0.86 + 925.37 * 4.10 * 1 + 46.51 * 3 * 1) / (4.60 * 0.29 + 2.80 * 0.43 + 3.65 * 0.57 + 3.10 * 0.86 + 4.10 * 1 + 3 * 1) = 511.2844537686357
p2 = (925.37 * 4.10 * 1 + 1000 * 3.10 * 0.86 + 214.95 * 4.60 * 0.29 + 113.92 * 3.65 * 0.57) / max_coefficients = 466.2969899665553
score = 511.2844537686357 * 0.5 + 466.2969899665553 * 0.5 = 488.7907218675955
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2026-01-14 | 69 -> 68 | 486.76 -> 488.79 |
Guardian of the Winds: 57% -> 43% |
| 2026-01-12 | 71 -> 69 | 485.35 -> 486.76 |
X Russian Championship: 43% -> 29% |
| 2026-01-07 | 65 -> 71 | 507.28 -> 485.35 |
Moscow Open Riichi Marathon: 100% -> 86% |
| 2025-12-13 | 67 -> 65 | 507.28 | |
| 2025-12-07 | 66 -> 67 | 507.28 | |
| 2025-12-04 | 69 -> 66 | 501.06 -> 507.28 |
Riichi over Volga: 71% -> 57% |
| 2025-11-30 | 66 -> 69 | 501.06 | |
| 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 |
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 | 86% | 3.10 | RR | Moscow Open Riichi Marathon | Moscow |
| 4 | 114 |
|
71/80 | 57% | 3.65 | RR | Riichi over Volga | Samara | |
| 5 | 191 |
|
39/48 | 43% | 2.80 | RR | Guardian of the Winds | Yekaterinburg | |
| 6 | 215 |
|
85/108 | 29% | 4.60 | RR | X Russian Championship | Perm |