This is a special tournament type for backgammon games (and variants) only. The section system is the same as for round robin tournaments - everybody plays one game with every other player of the same section - but the backgammon scoring rules are used to determine the number of points to the game winners:
0 points for a loss
1 point for a normal win
3 points for a gammon win
5 points for a backgammon win
Please see the backgammon rules page for the gammon and backgammon explanations.