Rules to play 3 Ball Pool
Shoot three rounds total
The only time someone would not shoot the final round of a game is if there is no way they can win, even if they get an ace. This could occur if one person gets low scores on all three of their rounds and someone else gets high scores on their two rounds. For example, if one person got threes during all three rounds (giving them a total of nine) and another person got a five on two rounds (giving them a total of 10), the person with the 10 has already lost and skips their final turn.