| WRO | = | Winner's old rating |
| LRO | = | Loser's old rating |
| K | = | constant = .1 |
| D | = | denominator = .5 |
| PW | = | Probability that the winner would win = (1/power(10,(-(WRO-LRO)/D))+1)) |
| PL | = | Probability that the lose would win = (1/Power(10,(-(LRO-WRO)/D))+1)) |
| WRN | = | Winners's new rating = (WRO+K*(1-PW)) |
| LRN | = | Loser's new rating = (LRO+K*K(0-PL) |