Zarezin Ivan
From Yekaterinburg, Russia
EMA: 15020003
Internal rating (RR)
Rating date Dec. 10, 2025 (latest changes Dec. 9, 2025).
106 place (385.84).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.90 * 1 + 3.50 * 1 + 3.45 * 1) = 14.95
p1 = (401.87 * 4.60 * 0.43 + 808.51 * 2.80 * 0.57 + 873.42 * 3.65 * 0.57 + 0 + 0) / (4.60 * 0.43 + 2.80 * 0.57 + 3.65 * 0.57 + 1 + 1) = 510.3074405550933
p2 = (873.42 * 3.65 * 0.57 + 808.51 * 2.80 * 0.57 + 401.87 * 4.60 * 0.43) / max_coefficients = 261.3692307692308
score = 510.3074405550933 * 0.5 + 261.3692307692308 * 0.5 = 385.8383356621621
Rating changes
| Date | Place | Points | Reason |
|---|---|---|---|
| 2025-12-07 | 105 -> 106 | 385.84 | |
| 2025-12-04 | 101 -> 105 | 412.65 -> 385.84 |
Riichi over Volga: 71% -> 57% |
| 2025-11-30 | 100 -> 101 | 412.65 | |
| 2025-11-14 | 94 -> 100 | 429.89 -> 412.65 |
Guardian of the Winds: 71% -> 57% |
| 2025-11-12 | 95 -> 94 | 433.58 -> 429.89 |
X Russian Championship: 57% -> 43% |
| 2025-11-04 | 88 -> 95 | 441.10 -> 433.58 | |
| 2025-11-01 | 90 -> 88 | 440.50 -> 441.10 | |
| 2025-10-13 | 91 -> 90 | 435.26 -> 440.50 | |
| 2025-10-09 | 92 -> 91 | 435.26 | |
| 2025-10-04 | 84 -> 92 | 459.65 -> 435.26 |
Riichi over Volga: 86% -> 71% |