SOL is a competition for teams of 4 on BBO using a league structure.  Teams can consist of up to 8 members and they compete in divisions of 8-10 teams. Matches are played weekly with National masterpoints awarded for matches won, and promotion and relegation at the end of each iteration. There are 3 iterations each year and new teams can apply to join at the start of a new iteration. 

SOL7

SOL6 Winners

SOL6 for reference