There are times when a player has several games left to complete a match but has no chance of winning. Since rating points are only given for the completed match and not for the individual games there is often no point (rating-wise) in playing out the match. A possible solution would be to have an option to resign the match which would end the match without playing out games that have no impact on the outcome. (It is true that a player could resign each remaining game individually but this seems to be a tidier way to handle it.)