If P played against Q in the 3rd, 14th, 25th and 36th rounds, then R must have lost in the 2nd, 13th, 24th and 35th rounds. So games won by R are 50 - 8 = 42, if R has won in the 50th round and games won by R are 50 - 9 = 41, if R has lost in the 50th round