You lost 4 but you don't loose anymore You won 6 and you keep on winning more games. Since you don't loose anymore games, in the ratio 2:1, you would replace the "1" with 4 and replace the 2 with 6+n. the ratio is currently 6+n:4 Note that (6+n) has to be twice as much as 4. The number twice as much as 4 is 8 therefore, 6+n is 8 and n = 2 You would have to win 2 more rounds.