Vakhonin Stepan
From Saint Petersburg, Russia
EMA: 15990444
Internal rating (RR)
Rating date Oct. 31, 2025 (latest changes Oct. 13, 2025).
84 place (461.02).
how we calculated rating score
max_coefficients = (4.10 * 1 + 3.50 * 1 + 3.45 * 1 + 3.85 * 0.86) = 14.349835
p1 = (978.26 * 2.10 * 0.43 + 94.74 * 3.85 * 0.86 + 830.51 * 3.25 * 1 + 610.39 * 3.45 * 1 + 0) / (2.10 * 0.43 + 3.85 * 0.86 + 3.25 * 1 + 3.45 * 1 + 1) = 504.0464642755251
p2 = (830.51 * 3.25 * 1 + 610.39 * 3.45 * 1 + 978.26 * 2.10 * 0.43 + 94.74 * 3.85 * 0.86) / max_coefficients = 417.9908688845551
score = 504.0464642755251 * 0.5 + 417.9908688845551 * 0.5 = 461.0186665800401
Rating changes
| Date | Place | Points | Reason | 
|---|---|---|---|
| 2025-10-13 | 83 -> 84 | 454.66 -> 461.02 | |
| 2025-10-09 | 84 -> 83 | 454.66 | |
| 2025-10-04 | 86 -> 84 | 454.66 | |
| 2025-09-30 | 81 -> 86 | 470.40 -> 454.66 | Seihoku spring tournament 2024: 57% -> 43% | 
| 2025-09-14 | 82 -> 81 | 470.40 | |
| 2025-09-12 | 83 -> 82 | 470.40 | |
| 2025-09-10 | 85 -> 83 | 470.40 | |
| 2025-09-03 | 70 -> 85 | 510.78 -> 470.40 | SPB Riichi Open 2023: 14% -> 0% | 
| 2025-09-01 | 76 -> 70 | 494.13 -> 510.78 | SPB Riichi Open 2024: 100% -> 86% | 
| 2025-08-31 | 101 -> 76 | 399.57 -> 494.13 | SPB Riichi Open 2025: 0% -> 100% | 
Tournaments
| # | Base rank | Date | Place | Power | Coefficient | Type | Tournament | City | |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 610 |  | 31/78 | 100% | 3.45 | RR | SPB Riichi Open 2025 | Saint Petersburg | |
| 2 | 831 |  | 11/60 | 100% | 3.25 | RR | White Wolf Cup | Saint Petersburg | |
| 3 | 95 |  | 87/96 | 86% | 3.85 | RR | SPB Riichi Open 2024 | Saint Petersburg | |
| 4 | 978 |  | 🥈 | 2/47 | 43% | 2.10 | RR | Seihoku spring tournament 2024 | Saint Petersburg | 
| 5 | 953 |  | 6/108 | 0% | 4.00 | RR | SPB Riichi Open 2023 | Saint Petersburg | |
| 6 | 198 |  | 90/112 | 0% | 4.05 | RR | Moscow Riichi 2022 | Moscow | |
| 7 | 173 |  | 63/76 | 0% | 3.45 | RR | Saint Petersburg Open 2021 | Saint Petersburg | |
| 8 | 222 |  | 50/64 | 0% | 3.45 | EMA | Saint Petersburg Open 2019 | Saint Petersburg | |
| 9 | 0 |  | 40/40 | 0% | 2.90 | RR | Summer Cup 2019 | Saint Petersburg |