Maniakhin Petr
From Saint Petersburg, Russia
EMA: 15990315
Common russian riichi rating (CRR)
Rating date Dec. 3, 2025 (latest changes Dec. 1, 2025).
108 place (414.79).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.90 * 1 + 3.50 * 1 + 3.45 * 1) = 14.95
p1 = (494.74 * 3.85 * 0.71 + 169.49 * 3.25 * 1 + 885.71 * 1.90 * 1 + 584.42 * 3.45 * 1 + 0) / (3.85 * 0.71 + 3.25 * 1 + 1.90 * 1 + 3.45 * 1 + 1) = 454.28866511120793
p2 = (584.42 * 3.45 * 1 + 885.71 * 1.90 * 1 + 494.74 * 3.85 * 0.71 + 169.49 * 3.25 * 1) / max_coefficients = 375.28361204013385
score = 454.28866511120793 * 0.5 + 375.28361204013385 * 0.5 = 414.78613857567086
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-11-30 | 107 -> 108 | 414.79 | |
| 2025-11-19 | 106 -> 107 | 414.79 | |
| 2025-11-14 | 107 -> 106 | 414.79 | |
| 2025-11-12 | 109 -> 107 | 414.79 | |
| 2025-11-04 | 105 -> 109 | 423.32 -> 414.79 | |
| 2025-11-01 | 101 -> 105 | 432.97 -> 423.32 |
SPB Riichi Open 2024: 86% -> 71% |
| 2025-10-13 | 103 -> 101 | 426.74 -> 432.97 | |
| 2025-10-09 | 104 -> 103 | 426.74 | |
| 2025-09-19 | 105 -> 104 | 426.74 | |
| 2025-09-05 | 106 -> 105 | 426.74 |