According to the Alliance's rules, when teams picked their home game maps, they were not allowed to use the same map twice in a season. Otherwise, if every team repeatedly used the same map, the matches would become stale. In the past two seasons, a new rule had been established. The following season, teams could repeat not more than half of the maps from last season. By the third season, maps used twice in two seasons were not allowed to be used again.
There were a total of 20 teams in the Alliance. Each team had 38 matches to play in a season with 19 home matches. In other words, each team had 19 chances to pick maps. In order to conform to the Alliance's rules, each team needed to practice over ten maps. Next season, half of their maps could be repeated, so they needed to practice 5 new maps to continue following the rules.
