Boiko Bogdan

From Kirov, Russia

Player page

Internal rating (RR)

Rating date Jan. 22, 2026 (latest changes Jan. 14, 2026).

68 place (488.79).

max_coefficients = (4.10 * 1 + 3.90 * 1 + 3.50 * 1 + 3.45 * 1) = 14.95

p1 = (214.95 * 4.60 * 0.29 + 191.49 * 2.80 * 0.43 + 113.92 * 3.65 * 0.57 + 1000 * 3.10 * 0.86 + 925.37 * 4.10 * 1 + 46.51 * 3 * 1) / (4.60 * 0.29 + 2.80 * 0.43 + 3.65 * 0.57 + 3.10 * 0.86 + 4.10 * 1 + 3 * 1) = 511.2844537686357

p2 = (925.37 * 4.10 * 1 + 1000 * 3.10 * 0.86 + 214.95 * 4.60 * 0.29 + 113.92 * 3.65 * 0.57) / max_coefficients = 466.2969899665553

score = 511.2844537686357 * 0.5 + 466.2969899665553 * 0.5 = 488.7907218675955

Rating changes

Show

all results
Date Place Points Reason
2026-01-14 69 -> 68 486.76 -> 488.79

Guardian of the Winds: 57% -> 43%
2026-01-12 71 -> 69 485.35 -> 486.76

X Russian Championship: 43% -> 29%
2026-01-07 65 -> 71 507.28 -> 485.35

Moscow Open Riichi Marathon: 100% -> 86%
2025-12-13 67 -> 65 507.28
2025-12-07 66 -> 67 507.28
2025-12-04 69 -> 66 501.06 -> 507.28

Riichi over Volga: 71% -> 57%
2025-11-30 66 -> 69 501.06
2025-11-14 67 -> 66 500.04 -> 501.06

Guardian of the Winds: 71% -> 57%
2025-11-12 68 -> 67 499.68 -> 500.04

X Russian Championship: 57% -> 43%
2025-11-04 65 -> 68 511.60 -> 499.68

Tournaments

# Base rank Date Place Power Coefficient Rating Tournament City
1 47 2025-08-03 42/44 100% 3.00 RR Two roosters and Chuckles Kirov
2 925 2025-06-15 6/68 100% 4.10 RR 13 bloody tiles Perm
3 1000 2025-01-07 🥇 1/32 86% 3.10 RR Moscow Open Riichi Marathon Moscow
4 114 2024-08-04 71/80 57% 3.65 RR Riichi over Volga Samara
5 191 2024-07-14 39/48 43% 2.80 RR Guardian of the Winds Yekaterinburg
6 215 2024-05-12 85/108 29% 4.60 RR X Russian Championship Perm