Maniakhin Petr
From Saint Petersburg, Russia
EMA: 15990315
Common russian riichi rating (CRR)
Rating date Aug. 31, 2026 (latest changes Aug. 31, 2026).
129 place (424.00).
how we calculated rating score
max_coefficients = (4.71 * 1 + 3.90 * 1 + 3.40 * 1 + 3.40 * 1) = 15.41
p1 = (494.74 * 3.85 * 0.14 + 169.49 * 3.25 * 0.43 + 885.71 * 1.90 * 0.57 + 584.42 * 3.45 * 0.86 + 540.54 * 3.40 * 1) / (3.85 * 0.14 + 3.25 * 0.43 + 1.90 * 0.57 + 3.45 * 0.86 + 3.40 * 1) = 536.5366933133882
p2 = (540.54 * 3.40 * 1 + 584.42 * 3.45 * 0.86 + 885.71 * 1.90 * 0.57 + 494.74 * 3.85 * 0.14) / max_coefficients = 311.46787800129783
score = 536.5366933133882 * 0.5 + 311.46787800129783 * 0.5 = 424.002285657343
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2026-08-31 | 121 -> 129 | 434.01 -> 424.00 |
SPB Riichi Open 2025: 100% -> 86% |
| 2026-08-27 | 122 -> 121 | 434.01 | |
| 2026-08-26 | 112 -> 122 | 446.43 -> 434.01 |
Seihoku spring tournament 2025: 71% -> 57% |
| 2026-08-16 | 112 | 439.52 -> 446.43 |
White Wolf Cup: 57% -> 43% |
| 2026-08-15 | 112 | 438.25 -> 439.52 | |
| 2026-08-13 | 113 -> 112 | 438.25 | |
| 2026-08-03 | 114 -> 113 | 438.25 | |
| 2026-07-25 | 112 -> 114 | 438.25 | |
| 2026-07-18 | 111 -> 112 | 438.25 | |
| 2026-07-14 | 112 -> 111 | 438.25 |