1. Chemistry is a special relationship between specified players.
2. You have to collect all specified players in order to activate a Chemistry which can improve their Overall.
3. Chemistry will be activated if you collect all required players regardless of whether you deploy them or not.
4. Players in the Chemistry can get Bonus Attribute each time they are Evolved or Promoted.
5. If you own more than 2 of the same player, Bonus Attribute the player gets would be decided by the one with higher rating.