Grebnev Grigorii
From Saint Petersburg, Russia
Internal rating (RR)
Rating date Aug. 27, 2025 (latest changes Aug. 9, 2025).
108 place (374.26).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.85 * 1 + 3.75 * 1 + 3.50 * 1) = 15.2
p1 = (700.93 * 4 * 0.14 + 239.13 * 2.10 * 0.57 + 484.21 * 3.85 * 1 + 593.22 * 3.25 * 1 + 0) / (4 * 0.14 + 2.10 * 0.57 + 3.85 * 1 + 3.25 * 1 + 1) = 453.80659957818136
p2 = (593.22 * 3.25 * 1 + 484.21 * 3.85 * 1 + 700.93 * 4 * 0.14 + 239.13 * 2.10 * 0.57) / max_coefficients = 294.72171052631575
score = 453.80659957818136 * 0.5 + 294.72171052631575 * 0.5 = 374.26415505224855
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-08-04 | 111 -> 108 | 372.82 -> 374.26 | |
| 2025-08-03 | 110 -> 111 | 372.82 | |
| 2025-07-30 | 110 | 371.99 -> 372.82 |
Seihoku spring tournament 2024: 71% -> 57% |
| 2025-07-14 | 111 -> 110 | 371.99 | |
| 2025-07-13 | 107 -> 111 | 371.99 | |
| 2025-07-12 | 110 -> 107 | 369.22 -> 371.99 | |
| 2025-07-03 | 106 -> 110 | 388.76 -> 369.22 |
SPB Riichi Open 2023: 29% -> 14% |
| 2025-06-15 | 101 -> 106 | 393.45 -> 388.76 | |
| 2025-06-11 | 102 -> 101 | 393.45 | |
| 2025-05-30 | 102 | 392.79 -> 393.45 |
Seihoku spring tournament 2024: 86% -> 71% |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Type | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 593 |
|
25/60 | 100% | 3.25 | RR | White Wolf Cup | Saint Petersburg | |
| 2 | 484 |
|
50/96 | 100% | 3.85 | RR | SPB Riichi Open 2024 | Saint Petersburg | |
| 3 | 239 |
|
36/47 | 57% | 2.10 | RR | Seihoku spring tournament 2024 | Saint Petersburg | |
| 4 | 701 |
|
33/108 | 14% | 4.00 | RR | SPB Riichi Open 2023 | Saint Petersburg |