赢x场 负y场 逃跑z场
逃跑率=z/(x+y+z)=0.5%
胜率=x/(x+y)=54%
x-y=680
y=3910
x=4590
z=43/42都行,43更接近
接下来的胜率计算,胜m,负n
(4590+m)/(8500+m+n)