#### Topic: To calculate probability of an outcome of a batch

Children, help , and that with mathematical apparatus not so.

There are two chess players with rating : https://ru.wikipedia.org/wiki/_

As I understood, for calculation of rating Gaussian distribution (normal distribution) is used.

looks so: A - the Difference of ratings. In - Expected result for the player with higher rating. About Expected result for the player with lower rating

AND IN WITH

0 0,5 0,5

25 0,53 0,47

50 0,57 0,43

100 0,64 0,36

Etc.

In chess three results (a victory white, a drawn game, a victory black) are possible.

Let's admit, at player A a rating X, and at player B rating Y.

How to calculate probability of victory A, probability of victory B and probability of a drawn game? Under what formulas?