does rank calculation depends on before or afte...

i couldn't find this issue in the F.A.Q. is rank calculation based on my opponent's rank when the game started or when it ended?

When it ended

when u win the game, u get more rank points, when u lose, u get less. the site doesnt know whos gonna win the game yet when its just started. so the points get added/taken away(win/lose) after the game finishes.