Boiko Bogdan
From Kirov, Russia
Internal rating (RR)
Rating date Sept. 3, 2025 (latest changes Sept. 3, 2025).
73 place (497.28).
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 * 0.71 + 191.49 * 2.80 * 0.86 + 113.92 * 3.65 * 0.86 + 1000 * 3.10 * 1 + 925.37 * 4.10 * 1 + 46.51 * 3 * 1) / (4.60 * 0.71 + 2.80 * 0.86 + 3.65 * 0.86 + 3.10 * 1 + 4.10 * 1 + 3 * 1) = 449.9719286896681
p2 = (925.37 * 4.10 * 1 + 1000 * 3.10 * 1 + 214.95 * 4.60 * 0.71 + 191.49 * 2.80 * 0.86) / max_coefficients = 544.5858108108108
score = 449.9719286896681 * 0.5 + 544.5858108108108 * 0.5 = 497.27886975023944
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-09-03 | 75 -> 73 | 497.28 | |
| 2025-09-01 | 78 -> 75 | 490.11 -> 497.28 | |
| 2025-08-31 | 71 -> 78 | 490.11 | |
| 2025-08-09 | 72 -> 71 | 490.11 | |
| 2025-08-04 | 76 -> 72 | 483.04 -> 490.11 |
Riichi over Volga: 100% -> 86% |
| 2025-08-03 | 61 -> 76 | 518.82 -> 483.04 |
Two roosters and Chuckles: 0% -> 100% |
| 2025-07-14 | 62 -> 61 | 517.52 -> 518.82 |
Guardian of the Winds: 100% -> 86% |
| 2025-07-13 | 60 -> 62 | 517.52 | |
| 2025-07-12 | 64 -> 60 | 511.66 -> 517.52 |
X Russian Championship: 86% -> 71% |
| 2025-07-03 | 65 -> 64 | 511.66 |
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 | 86% | 3.65 | RR | Riichi over Volga | Samara | |
| 5 | 191 |
|
39/48 | 86% | 2.80 | RR | Guardian of the Winds | Yekaterinburg | |
| 6 | 215 |
|
85/108 | 71% | 4.60 | RR | X Russian Championship | Perm |