Good morning !
The rankings reflect the successes of the last 180 days. For all games with a single winner with at least 6 players, the winner may award ranking points.
For each game as many points may be awarded as players have participated. The winner may share the points at will. He can award himself all the points, but he can also share the points with his allies. He can award points to his enemies, too.
This shall discourage players to quickly crowne someone just to receive some ranking points. Also a game with strong opponents is more exciting, so it is possible to reward the opponents. It is even possible to award points to players that were exiled.
The 180 days rule shall ensure that players don't rest on their laurels. And it means, that regular players are privileged.
Only games where the scenario description explicitly says so are scored.