Talk:Elo rating system/@comment-5800348-20121128133116

I feel the calculation displayed here is wrong and some of the assumptions are a little off.

A quick explanation if anyone is interested. The RaWin and RaLoss calculation is almost the same. With that I mean, you will lose the same amount you win by using this.

if Ea = A's chance of winning

then Eb = B's chance of winning

to calculate Eb, change (Rb-Ra) to (Ra-Rb) in first formula OR Eb=1-Ea

The Win formula can stay the same, but the Loss formula needs to change:

Ra_{win} = Ra_{old} + K(2-Ea)

Ra_{lost} = Ra_{old} - K(2-Eb)   OR    Ra_{lost} = Ra_{old} - K(1+Ea)

But I could be way wrong. It's been a few years