Grebnev Grigorii
From Saint Petersburg, Russia
Common russian riichi rating (CRR)
Rating date Dec. 10, 2025 (latest changes Dec. 9, 2025).
114 place (405.09).
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 + 666.67 * 2 * 1 + 0) / (2.10 * 0.29 + 3.85 * 0.71 + 3.25 * 1 + 2 * 1 + 1) = 493.3716318447087
p2 = (593.22 * 3.25 * 1 + 666.67 * 2 * 1 + 484.21 * 3.85 * 0.71 + 239.13 * 2.10 * 0.29) / max_coefficients = 316.81471571906354
score = 493.3716318447087 * 0.5 + 316.81471571906354 * 0.5 = 405.0931737818861
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-12-09 | 115 -> 114 | 405.09 | |
| 2025-12-07 | 112 -> 115 | 405.09 | |
| 2025-11-30 | 112 | 403.64 -> 405.09 |
Seihoku spring tournament 2024: 43% -> 29% |
| 2025-11-19 | 113 -> 112 | 403.64 | |
| 2025-11-14 | 114 -> 113 | 403.64 | |
| 2025-11-10 | 115 -> 114 | 403.64 | |
| 2025-11-04 | 111 -> 115 | 410.95 -> 403.64 | |
| 2025-11-01 | 109 -> 111 | 419.60 -> 410.95 |
SPB Riichi Open 2024: 86% -> 71% |
| 2025-10-13 | 110 -> 109 | 414.22 -> 419.60 | |
| 2025-10-09 | 111 -> 110 | 414.22 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Rating | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 667 |
|
7/19 | 100% | 2.00 | CRR | Tonpu-master | Saint Petersburg | |
| 2 | 593 |
|
25/60 | 100% | 3.25 | RR | White Wolf Cup | Saint Petersburg | |
| 3 | 484 |
|
50/96 | 71% | 3.85 | RR | SPB Riichi Open 2024 | Saint Petersburg | |
| 4 | 239 |
|
36/47 | 29% | 2.10 | RR | Seihoku spring tournament 2024 | Saint Petersburg | |
| 5 | 701 |
|
33/108 | 0% | 4.00 | RR | SPB Riichi Open 2023 | Saint Petersburg | |
| 6 | 355 |
|
21/32 | 0% | 1.80 | CRR | Earth cup | Saint Petersburg | |
| 7 | 282 |
|
29/40 | 0% | 1.80 | CRR | Sun tournament | Saint Petersburg |