Grebnev Grigorii
From Saint Petersburg, Russia
Common russian riichi rating (CRR)
Rating date Oct. 9, 2025 (latest changes Oct. 9, 2025).
110 place (414.22).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.75 * 1 + 3.50 * 1 + 3.45 * 1) = 14.8
p1 = (666.67 * 2 * 1 + 239.13 * 2.10 * 0.43 + 484.21 * 3.85 * 0.86 + 593.22 * 3.25 * 1 + 0) / (2 * 1 + 2.10 * 0.43 + 3.85 * 0.86 + 3.25 * 1 + 1) = 485.5876542300186
p2 = (593.22 * 3.25 * 1 + 484.21 * 3.85 * 0.86 + 666.67 * 2 * 1 + 239.13 * 2.10 * 0.43) / max_coefficients = 342.86081081081073
score = 485.5876542300186 * 0.5 + 342.86081081081073 * 0.5 = 414.22423252041466
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-10-09 | 111 -> 110 | 414.22 | |
| 2025-09-30 | 112 -> 111 | 413.21 -> 414.22 |
Seihoku spring tournament 2024: 57% -> 43% |
| 2025-09-12 | 114 -> 112 | 413.21 | |
| 2025-09-10 | 115 -> 114 | 413.21 | |
| 2025-09-03 | 102 -> 115 | 446.39 -> 413.21 |
SPB Riichi Open 2023: 14% -> 0% |
| 2025-09-01 | 103 -> 102 | 449.14 -> 446.39 |
SPB Riichi Open 2024: 100% -> 86% |
| 2025-08-31 | 98 -> 103 | 449.14 | |
| 2025-08-09 | 99 -> 98 | 449.14 | |
| 2025-08-04 | 99 | 447.36 -> 449.14 | |
| 2025-08-03 | 98 -> 99 | 447.36 |
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Type | 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 | 86% | 3.85 | RR | SPB Riichi Open 2024 | Saint Petersburg | |
| 4 | 239 |
|
36/47 | 43% | 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 |