Boiko Bogdan
From Kirov, Russia
Internal rating (RR)
Rating date Aug. 4, 2025 (latest changes Aug. 4, 2025).
72 place (490.11).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.85 * 1 + 3.75 * 1 + 3.50 * 1) = 15.2
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 = 530.2546052631579
score = 449.9719286896681 * 0.5 + 530.2546052631579 * 0.5 = 490.113266976413
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 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 | |
| 2025-06-15 | 120 -> 65 | 330.28 -> 511.66 |
13 bloody tiles: 0% -> 100% |
| 2025-06-11 | 123 -> 120 | 330.28 | |
| 2025-05-12 | 124 -> 123 | 325.38 -> 330.28 |
X Russian Championship: 100% -> 86% |
| 2025-05-10 | 125 -> 124 | 325.38 |
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 |