combat points earned have been added to the game summary. per kill you get combat points with the following formula 10+(rank of victim) = combat points earned for that kill.
Your combat points don't reset so its your total points that count towards rank Life time Rank Points needed 0 0 1 100 2 325 3 750 4 1200 5 2000 6 4000 7 7000 8 10000 9 14000 10 19000 11 27000 12 34000 13 50000 14 70000 15 100000