In the dominoes game, how to count the rating?

When the game is over.

Example: old rating 1400, new rating 1415.

The 15 point was counting by what?In the dominoes game, how to count the rating?
There's a lot of different games of dominoes, perhaps you should specify a bit.In the dominoes game, how to count the rating?
when you go out the count of your oppents left over dominos