Below are the rules as of 2/25 for PS3 leaderboard site:
COD4 League Rules:
> Any clan found cheating, using glitches, creating false clans or reporting false wins will be expelled from the League.
> Not turning up for a scheduled match is an instant forfeit. If you cannot make a scheduled match then you must cancel it with the opposition leader within 6 hours of the start time to avoid a forfeit.
>All weapons and settings are in play.
> lans should only use members that are signed up on their Team Roster and have been in place for at least 1 week. Opposing clans should confirm that the other clan's players are listed on their roster BEFORE starting the match.
> Matches should be a minimum of 2x2 players though more are recommended for a fairer match.
> You MUST TAKE PICTURES of each map's results to prove the win. Make sure other clan members take pictures as back up!
> All Clans can challenge any other clan ANYWHERE on the whole Leaderboard.
> Spectators are NOT allowed in clan matches
> You must contact your opponent to arrange the match and agree the match settings and match rules. To avoid post-match arguments and disputes we would strongly recommend that proof of the match settigngs and agreement is written in the Forum.
> You can NOT score against the SAME clan within any 1 week period.
> You can have as many challenges 'open' as you wish.
> You CAN turn down challenges but idleness will allow Clans to move past you!
> You MUST report a match result in within 24 hours of the match end. Bare in mind that you cannot play the same clan within the same 7 days so it is in your interest to report it on the night!
> Report the win or loss to us directly on here or via the Forum.
Any Clan found cheating, using glitches or codes, claiming false wins or forfeits, sending in edited results pictures or harrassing other clan members will be removed from the league and further action may be taken.