Zarezin Ivan
From Yekaterinburg, Russia
EMA: 15020003
Common russian riichi rating (CRR)
Rating date Oct. 10, 2025 (latest changes Oct. 9, 2025).
61 place (547.75).
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 * 0.14 + 808.51 * 2.80 * 0.71 + 873.42 * 3.65 * 0.71 + 401.87 * 4.60 * 0.57 + 851.85 * 2.30 * 0.43) / (2.30 * 0.14 + 2.80 * 0.71 + 3.65 * 0.71 + 4.60 * 0.57 + 2.30 * 0.43) = 704.2633879621643
p2 = (873.42 * 3.65 * 0.71 + 808.51 * 2.80 * 0.71 + 401.87 * 4.60 * 0.57 + 851.85 * 2.30 * 0.43) / max_coefficients = 391.23310810810807
score = 704.2633879621643 * 0.5 + 391.23310810810807 * 0.5 = 547.7482480351362
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-10-04 | 53 -> 61 | 567.99 -> 547.75 |
Riichi over Volga: 86% -> 71% |
| 2025-09-26 | 52 -> 53 | 567.99 | |
| 2025-09-15 | 53 -> 52 | 567.99 | |
| 2025-09-14 | 50 -> 53 | 580.90 -> 567.99 |
Guardian of the Winds: 86% -> 71% |
| 2025-09-12 | 55 -> 50 | 579.57 -> 580.90 |
X Russian Championship: 71% -> 57% |
| 2025-09-05 | 55 | 579.67 -> 579.57 |
Finding Dora: 29% -> 14% |
| 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% |