In general, AYSO plays by the FIFA international soccer rules. However, there are variations to fit the rules to youth soccer, as well as the AYSO philosophy.
Some rule variations come from the AYSO national office.
Some come from the Davis AYSO Region 218 board of directors. This can be adjusted to a lower amount if the player arrives late to the game. Teams from other Regions that participate in games in Davis in regular Fall season games must abide by this rule as well. Free substitution allowed. 11 players on the field per team.