Rules to play 8 Ball Pool
Open Table Choosing Groups
Before groups are determined, the table is said to be open, and before each shot, the shooter must call his intended ball. If the shooter legally pockets his called ball, the corresponding group becomes his, and his opponent is assigned the other group. If he fails to legally pocket his called ball, the table remains open and play passes to the other player. When the table is open, any object ball may be struck first except the eight ball.