Maniakhin Petr
From Saint Petersburg, Russia
EMA: 15990315
Common russian riichi rating (CRR)
Rating date Jan. 14, 2026 (latest changes Jan. 14, 2026).
116 place (404.74).
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 * 0.57 + 169.49 * 3.25 * 1 + 885.71 * 1.90 * 1 + 584.42 * 3.45 * 1 + 0) / (3.85 * 0.57 + 3.25 * 1 + 1.90 * 1 + 3.45 * 1 + 1) = 452.40336986192233
p2 = (584.42 * 3.45 * 1 + 885.71 * 1.90 * 1 + 494.74 * 3.85 * 0.57 + 169.49 * 3.25 * 1) / max_coefficients = 357.0775919732442
score = 452.40336986192233 * 0.5 + 357.0775919732442 * 0.5 = 404.7404809175832
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2026-01-12 | 117 -> 116 | 404.74 | |
| 2026-01-07 | 112 -> 117 | 404.74 | |
| 2026-01-04 | 113 -> 112 | 404.74 | |
| 2026-01-03 | 111 -> 113 | 404.74 | |
| 2026-01-01 | 109 -> 111 | 414.79 -> 404.74 |
SPB Riichi Open 2024: 71% -> 57% |
| 2025-12-13 | 110 -> 109 | 414.79 | |
| 2025-12-07 | 107 -> 110 | 414.79 | |
| 2025-12-04 | 108 -> 107 | 414.79 | |
| 2025-11-30 | 107 -> 108 | 414.79 | |
| 2025-11-19 | 106 -> 107 | 414.79 |