hello.
I think you mean increasing or decreasing in your rating.
some matches are unreted(you can find it from 4th line of Details tab on the page u r playing),such a games will not increase or decrease ur rating but the games that have rating will affect ur rating by losing or winning or even drawing.
if u mean sth else of the thing i answered tell it.
good luck.
what is the methoed used in calculation, and why some time no score be added at the end in the game?