The scoring system was changed for session five.  A ranking is awarded after 8 games have been played.  The average is based on all games played.  All league game scores for session five onwards are calculated as follows:

1st - 256 points, 2nd - 128 points, 3rd - 64 points, 4th - 32 points, 5th - 16 points,
6th - 8 points, 7th - 4 points, 8th - 2 points, 9th - 1 point, 10th - no points.

Check out the current scores here.