Maniakhin Petr
From Saint Petersburg, Russia
EMA: 15990315
Common russian riichi rating (CRR)
Rating date Sept. 4, 2025 (latest changes Sept. 3, 2025).
106 place (426.74).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.75 * 1 + 3.50 * 1 + 3.45 * 1) = 14.8
p1 = (494.74 * 3.85 * 0.86 + 169.49 * 3.25 * 1 + 885.71 * 1.90 * 1 + 584.42 * 3.45 * 1 + 0) / (3.85 * 0.86 + 3.25 * 1 + 1.90 * 1 + 3.45 * 1 + 1) = 456.0128094661676
p2 = (584.42 * 3.45 * 1 + 885.71 * 1.90 * 1 + 494.74 * 3.85 * 0.86 + 169.49 * 3.25 * 1) / max_coefficients = 397.4655405405406
score = 456.0128094661676 * 0.5 + 397.4655405405406 * 0.5 = 426.7391750033541
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-09-03 | 100 -> 106 | 450.21 -> 426.74 |
SPB Riichi Open 2023: 14% -> 0% |
| 2025-09-01 | 99 -> 100 | 453.76 -> 450.21 |
SPB Riichi Open 2024: 100% -> 86% |
| 2025-08-31 | 133 -> 99 | 363.14 -> 453.76 |
SPB Riichi Open 2025: 0% -> 100% |
| 2025-08-26 | 135 -> 133 | 363.14 | |
| 2025-08-25 | 136 -> 135 | 363.14 | |
| 2025-08-04 | 137 -> 136 | 361.68 -> 363.14 | |
| 2025-08-03 | 135 -> 137 | 361.68 | |
| 2025-07-13 | 132 -> 135 | 361.68 | |
| 2025-07-12 | 131 -> 132 | 358.92 -> 361.68 | |
| 2025-07-03 | 125 -> 131 | 377.89 -> 358.92 |
SPB Riichi Open 2023: 29% -> 14% |