The Major League Gaming organization has released a set of Player Movement rules. You can find the complete list below.

Player Movement
Free Agent: A player who is not currently a part of a Pro or Semi-Pro team, and is free to join any team. Players leaving a Pro or Semi-Pro team must file for Free Agency. Players are not allowed to file for Free Agency from a Pro team more than 3 times during the 2007 Pro Circuit.

Trade Rules: Trades may only be made between two Pro/Semi-Pro teams. A trade request must be sent by each team captain. Trades may only be made by moving 1 player for 1 player.

Captain Change: Pro/Semi-Pro teams may change their captain at any time. The captain may relinquish the role and remain on or leave the team. Teams can request a captain change if 3 members submit requests for the same new captain.

Free Player Movement Period: The period of time during which players are allowed to leave a Pro or Semi-Pro team and join any other team. Such players may also join a Pro or Semi-Pro team during the Restricted Player Movement Period. Pro and Semi-Pro captains are allowed to release or trade 1 player. Each Free Player Movement Period will run from the Monday after a competition to the Thursday, three weeks before the upcoming competition. Pro team rosters are locked at the end of this period and can only be changed if a player is unable to attend or physically unable to play in the upcoming competition.

Restricted Player Movement Period: The period of time during which players are allowed to leave a Semi-Pro team and join another Semi-Pro or Amateur team, but may not join a Pro team until after the upcoming competition. Semi-Pro captains are allowed to release or trade 1 player as long as they didn’t do so during the Free Player Movement Period. Each Restricted Player Movement Period will run from the end of a Free Player Movement Period to the upcoming competition’s Registration Deadline. Players who leave a Pro Team during the Restricted Player Movement Period are not allowed to compete in the upcoming competition.

Highly Restricted Player Movement Period: The period of time during which teams can only be changed if a member(s) is unable to attend or is physically unable to play at the upcoming competition. These players may only be replaced by someone who was not a member of an attending and/or Pro/Semi-Pro team at the Registration Deadline.

National Championship Player Movement Deadline: No player movement is allowed after this date by teams earning the automatic spot in the National Championship competition. Substitute Ranking rosters received before the final Regular Season competition will be accepted.

Late Substitution: Teams can request that a substitution be allowed during the Highly Restricted Player Movement Period if one of their members plans on attending the competition as a spectator, but has become physically unable to play. The request must be accompanied by official documentation from a licensed physician and submitted to the League Commissioner prior to the start of the competition. Teams earning a National Championship invitation can also request that a substitution be allowed after the National Championship Player Movement Deadline. These requests must be submitted at least 1 week prior to the competition unless an injury occurs in the week prior to the competition. Substitutes for teams earning a National Championship invitation can’t be players who were on a Pro or Semi-Pro team following the last Regular Season competition. After a request has been submitted the Office of the Commissioner of Major League Gaming will decide whether to grant or deny the request for substitution. Player’s deemed physically unable to play by the Office of the Commissioner of Major League Gaming can’t compete in the upcoming competition.

Substitute Ranking: Teams may declare a roster for post-competition ranking and status that is different from the roster they compete with at the upcoming competition. Members of the Substitute Ranking roster who are not on the upcoming competition roster (Substitutes) must have been a member of the team’s roster for the previous competition. Substitutes can’t attend the upcoming competition with a different team. Members of the upcoming competition roster who are not on the Substitute Ranking roster will be considered as having filed for free agency during the post-competition Free Player Movement period. These players can’t be added back to the team during any of the post-competition player movement periods. Substitute Ranking rosters must be submitted before the start of the upcoming competition. Substitutes can’t leave the team during any of the post-competition player movement periods.

Incomplete Teams: If a Pro or Semi-Pro team is incomplete (less than 4 players) at the end of the Restricted Player Movement Period, it will lose Pro/Semi-Pro status.

Team Disbanding: Pro/Semi-Pro teams must retain at least 2 players from the previous competition’s roster in order to keep their status. Disbanded teams can not reform and participate in the upcoming competition’s Open Bracket with more than 2 players from the previous competition’s roster.

All Player Movement, Captain Change, Substitute Ranking, or Late Substitution requests made by Pro/Semi-Pro teams must be submitted to jnelson@mlgpro.com.