Twice a year I run a Fifa Tournament with mates. Sometimes we have a league, and other times a group stage with knockout. The numbers also vary, from around 6 to 16.
I've been trying to come up with a good rankings system, but have been struggling. I'd prefer it to be weighted towards those who have had the most recent success, but obviously with a respect for results gained previously.
Also some people only participate in some tournaments.
I would really appreciate some suggestions on how to proceed with this.