Grebnev Grigorii
From Saint Petersburg, Russia
Common russian riichi rating (CRR)
Rating date Aug. 27, 2025 (latest changes Aug. 27, 2025).
98 place (449.14).
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 + 666.67 * 2 * 1) / (4 * 0.14 + 2.10 * 0.57 + 3.85 * 1 + 3.25 * 1 + 2 * 1) = 534.7080542407056
p2 = (593.22 * 3.25 * 1 + 484.21 * 3.85 * 1 + 666.67 * 2 * 1 + 700.93 * 4 * 0.14) / max_coefficients = 363.56315789473683
score = 534.7080542407056 * 0.5 + 363.56315789473683 * 0.5 = 449.1356060677212
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-08-09 | 99 -> 98 | 449.14 | |
| 2025-08-04 | 99 | 447.36 -> 449.14 | |
| 2025-08-03 | 98 -> 99 | 447.36 | |
| 2025-07-30 | 100 -> 98 | 443.39 -> 447.36 |
Seihoku spring tournament 2024: 71% -> 57% |
| 2025-07-26 | 97 -> 100 | 443.39 | |
| 2025-07-13 | 94 -> 97 | 443.39 | |
| 2025-07-12 | 96 -> 94 | 440.02 -> 443.39 | |
| 2025-07-03 | 91 -> 96 | 457.06 -> 440.02 |
SPB Riichi Open 2023: 29% -> 14% |
| 2025-06-15 | 87 -> 91 | 462.67 -> 457.06 | |
| 2025-06-14 | 112 -> 87 | 393.45 -> 462.67 |
Tonpu-master: 0% -> 100% |
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 | 100% | 3.85 | RR | SPB Riichi Open 2024 | Saint Petersburg | |
| 4 | 239 |
|
36/47 | 57% | 2.10 | RR | Seihoku spring tournament 2024 | Saint Petersburg | |
| 5 | 701 |
|
33/108 | 14% | 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 |