prize13-9, Exercise 3: A twelve-game match

Model answer (check the details):

With 3 wins, 1 loss and 8 draws for the first player:

    print(points(3, 8))   # 7.0
    print(points(1, 8))   # 5.0

The first player scores 3 + 8/2 = 7 points and the second scores 1 + 8/2 = 5 points. The totals add to 12, the number of games, and the first player wins by 2 points, which is the difference in wins (3 - 1).

Care: some tournaments settle ties with extra games, so a match with equal scores would not necessarily end in a draw.