Maniakhin Petr
From Saint Petersburg, Russia
EMA: 15990315
Internal rating (RR)
Rating date Oct. 13, 2025 (latest changes Oct. 13, 2025).
92 place (432.97).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.50 * 1 + 3.45 * 1 + 3.85 * 0.86) = 14.349835
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 = 409.93433025536535
score = 456.0128094661676 * 0.5 + 409.93433025536535 * 0.5 = 432.9735698607665
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-10-13 | 94 -> 92 | 426.74 -> 432.97 | |
| 2025-10-09 | 95 -> 94 | 426.74 | |
| 2025-10-04 | 96 -> 95 | 426.74 | |
| 2025-09-12 | 97 -> 96 | 426.74 | |
| 2025-09-03 | 92 -> 97 | 450.21 -> 426.74 |
SPB Riichi Open 2023: 14% -> 0% |
| 2025-09-01 | 92 | 453.76 -> 450.21 |
SPB Riichi Open 2024: 100% -> 86% |
| 2025-08-31 | 116 -> 92 | 363.14 -> 453.76 |
SPB Riichi Open 2025: 0% -> 100% |
| 2025-08-04 | 117 -> 116 | 361.68 -> 363.14 | |
| 2025-08-03 | 116 -> 117 | 361.68 | |
| 2025-07-13 | 112 -> 116 | 361.68 |