Grebnev Grigorii
From Saint Petersburg, Russia
Internal rating (RR)
Rating date Sept. 1, 2025 (latest changes Sept. 1, 2025).
118 place (368.35).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.75 * 1 + 3.50 * 1 + 3.45 * 1) = 14.8
p1 = (700.93 * 4 * 0.14 + 239.13 * 2.10 * 0.57 + 484.21 * 3.85 * 0.86 + 593.22 * 3.25 * 1 + 0) / (4 * 0.14 + 2.10 * 0.57 + 3.85 * 0.86 + 3.25 * 1 + 1) = 452.0116399136393
p2 = (593.22 * 3.25 * 1 + 484.21 * 3.85 * 0.86 + 700.93 * 4 * 0.14 + 239.13 * 2.10 * 0.57) / max_coefficients = 284.68716216216217
score = 452.0116399136393 * 0.5 + 284.68716216216217 * 0.5 = 368.34940103790075
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-09-01 | 114 -> 118 | 374.26 -> 368.35 |
SPB Riichi Open 2024: 100% -> 86% |
| 2025-08-31 | 108 -> 114 | 374.26 | |
| 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 |
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 | 86% | 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 |