Grebnev Grigorii
From Saint Petersburg, Russia
Internal rating (RR)
Rating date Dec. 10, 2025 (latest changes Dec. 9, 2025).
134 place (311.67).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.90 * 1 + 3.50 * 1 + 3.45 * 1) = 14.95
p1 = (239.13 * 2.10 * 0.29 + 484.21 * 3.85 * 0.71 + 593.22 * 3.25 * 1 + 0 + 0) / (2.10 * 0.29 + 3.85 * 0.71 + 3.25 * 1 + 1 + 1) = 395.70233807459863
p2 = (593.22 * 3.25 * 1 + 484.21 * 3.85 * 0.71 + 239.13 * 2.10 * 0.29) / max_coefficients = 227.62876254180603
score = 395.70233807459863 * 0.5 + 227.62876254180603 * 0.5 = 311.66555030820234
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-12-09 | 135 -> 134 | 311.67 | |
| 2025-12-07 | 133 -> 135 | 311.67 | |
| 2025-11-30 | 132 -> 133 | 311.43 -> 311.67 |
Seihoku spring tournament 2024: 43% -> 29% |
| 2025-11-14 | 133 -> 132 | 311.43 | |
| 2025-11-12 | 137 -> 133 | 311.43 | |
| 2025-11-10 | 138 -> 137 | 311.43 | |
| 2025-11-04 | 131 -> 138 | 316.71 -> 311.43 | |
| 2025-11-01 | 126 -> 131 | 328.29 -> 316.71 |
SPB Riichi Open 2024: 86% -> 71% |
| 2025-10-13 | 125 -> 126 | 324.32 -> 328.29 | |
| 2025-10-09 | 126 -> 125 | 324.32 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Rating | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 593 |
|
25/60 | 100% | 3.25 | RR | White Wolf Cup | Saint Petersburg | |
| 2 | 484 |
|
50/96 | 71% | 3.85 | RR | SPB Riichi Open 2024 | Saint Petersburg | |
| 3 | 239 |
|
36/47 | 29% | 2.10 | RR | Seihoku spring tournament 2024 | Saint Petersburg | |
| 4 | 701 |
|
33/108 | 0% | 4.00 | RR | SPB Riichi Open 2023 | Saint Petersburg |