Sun Fei
SunFei12
Beijing Tongzhou TT Club
π ζι³εΊ
π¨π³ CN
1398
Rating
Bayesian conservative rating = ΞΌ β 2Ο. The system is 95% confident this player's skill is at least this value. More matches lower Ο and raise this number.
1490
ΞΌ (mean)
ΞΌ (Mu) is the best estimate of this player's skill level. Wins raise it, losses lower it. Beating a stronger player earns more than beating a weaker one.
45.8
Ο (uncertainty)
Ο (Sigma) = how confident the system is in the rating. Lower is better. New players start at Ο=200 β it falls with every match played.
42%
Win Rate
Wins Γ· (wins + losses). Requires at least 1 match.
5
Wins
7
Losses
Skill Confidence Intervals
Based on ΞΌ and Ο, the system estimates this player's skill range at different confidence levels. The smaller Ο is, the narrower the band.
68% (1Ο)1444 β 1536
95% (2Ο)1398 β 1582
99.7% (3Ο)1353 β 1627
Trust Level
How reliably this player submits match results. Formula: rejections per 10 submissions. Fewer rejections = higher trust.
No data
No submissions yet
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Login / RegisterRecent Matches
| Date | Player A | Player B | ΞΞΌ Change in ΞΌ after this match. Positive = won. The size depends on the skill gap between both players and their Ο values. | ||
|---|---|---|---|---|---|
| 5/15/2026 | |
π SunFei12 |  |
GuoRui16 | +6.0 |
| 5/12/2026 |  |
π CaiJun101 | |
SunFei12 | +3.0 |
| 4/26/2026 | |
SunFei12 |  |
π HuangXia88 | -2.0 |
| 4/3/2026 |  |
π GaoYong18 | |
SunFei12 | -8.0 |
| 3/29/2026 |  |
π LiuTao44 | |
SunFei12 | -11.0 |
| 3/18/2026 |  |
TanHao108 | |
π SunFei12 | +2.0 |
| 3/10/2026 |  |
SongQiang20 | |
π SunFei12 | +7.0 |
| 3/7/2026 |  |
π LuoHui19 | |
SunFei12 | -1.0 |
| 3/6/2026 | |
π SunFei12 |  |
ZhuKai14 | -5.0 |
| 2/22/2026 | |
SunFei12 |  |
π MaDong13 | +18.0 |