USHAKOV Igor
From Moscow, Russia
EMA: 15990490
Internal rating (RR)
Rating date Dec. 10, 2025 (latest changes Dec. 9, 2025).
180 place (196.22).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.90 * 1 + 3.50 * 1 + 3.45 * 1) = 14.95
p1 = (697.67 * 3 * 1 + 51.95 * 3.45 * 1 + 0 + 0 + 0) / (3 * 1 + 3.45 * 1 + 1 + 1 + 1) = 240.44867724867726
p2 = (697.67 * 3 * 1 + 51.95 * 3.45 * 1) / max_coefficients = 151.98929765886288
score = 240.44867724867726 * 0.5 + 151.98929765886288 * 0.5 = 196.21898745377007
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-12-09 | 182 -> 180 | 196.22 | |
| 2025-12-07 | 177 -> 182 | 196.22 | |
| 2025-12-04 | 179 -> 177 | 196.22 | |
| 2025-11-12 | 181 -> 179 | 196.22 | |
| 2025-11-04 | 173 -> 181 | 199.67 -> 196.22 | |
| 2025-11-01 | 173 | 199.40 -> 199.67 | |
| 2025-10-13 | 172 -> 173 | 196.99 -> 199.40 | |
| 2025-10-04 | 174 -> 172 | 196.99 | |
| 2025-09-30 | 176 -> 174 | 196.99 | |
| 2025-09-12 | 178 -> 176 | 196.99 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Rating | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 52 |
|
74/78 | 100% | 3.45 | RR | SPB Riichi Open 2025 | Saint Petersburg | |
| 2 | 698 |
|
14/44 | 100% | 3.00 | RR | Two roosters and Chuckles | Kirov |