The line between Keeper leagues and Dynasty leagues is not well-defined in the fantasy sports industry. The Machine operates differently depending on whether you specify your league is a keeper league or a dynasty league. Advanced Sports Logic makes the distinction that a keeper league is where you must surrender a draft pick to keep a player. A dynasty league is where you drop players to get down to a core number of players that you can keep into next season. The following table clarifies the differences:
|League Type||Pre-Draft Player Selection||How to Keep Player||Draft Rounds||Final Roster|
|Re-Draft||None||N/A||Equals roster size||Equals Draft|
|Keeper||Which players to keep||Allocate draft pick||Equals roster size||Equals Draft|
|Dynasty||Which players to drop||Don't drop from roster||Less than roster size||Equals Draft + Kept Players|
First year Dynasty and Keeper leagues should be treated as re-draft leagues.