Zarezin Ivan
From Yekaterinburg, Russia
EMA: 15020003
Common russian riichi rating (CRR)
Rating date Sept. 4, 2025 (latest changes Sept. 3, 2025).
55 place (579.67).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.75 * 1 + 3.50 * 1 + 3.45 * 1) = 14.8
p1 = (703.70 * 2.30 * 0.29 + 851.85 * 2.30 * 0.43 + 401.87 * 4.60 * 0.71 + 808.51 * 2.80 * 0.86 + 873.42 * 3.65 * 0.86) / (2.30 * 0.29 + 2.30 * 0.43 + 4.60 * 0.71 + 2.80 * 0.86 + 3.65 * 0.86) = 697.653669109536
p2 = (873.42 * 3.65 * 0.86 + 808.51 * 2.80 * 0.86 + 401.87 * 4.60 * 0.71 + 851.85 * 2.30 * 0.43) / max_coefficients = 461.6844594594594
score = 697.653669109536 * 0.5 + 461.6844594594594 * 0.5 = 579.6690642844977
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-09-01 | 57 -> 55 | 573.59 -> 579.67 | |
| 2025-08-31 | 52 -> 57 | 573.59 | |
| 2025-08-26 | 52 | 572.67 -> 573.59 | |
| 2025-08-25 | 46 -> 52 | 584.19 -> 572.67 |
Chasing Kan: 57% -> 43% |
| 2025-08-04 | 44 -> 46 | 600.63 -> 584.19 |
Riichi over Volga: 100% -> 86% |
| 2025-08-03 | 43 -> 44 | 600.63 | |
| 2025-07-19 | 42 -> 43 | 600.63 | |
| 2025-07-14 | 39 -> 42 | 612.84 -> 600.63 |
Guardian of the Winds: 100% -> 86% |
| 2025-07-13 | 37 -> 39 | 612.84 | |
| 2025-07-12 | 39 -> 37 | 608.43 -> 612.84 |
X Russian Championship: 86% -> 71% |