Back in the day, I remember the 'safe' ball spot. That meant that if a player got a 'safe' ball as part of his spot it meant that he could not lose the game if he made that ball. He could only win if he made the nine. A common spot used to be the 'seven safe' eight, nine. This meant that he could not lose if he made the seven and could win just be making the 8 or 9. The player who is giving the spot would have to make the 7,8, and 9 to win the game.