<P> All three of these elements must be present in order for the referee to decide that a player has made his best attempt . </P> <P> There are three situations in which a miss will not be called, even if the referee decides that a best attempt has not been made: </P> <Ul> <Li> If either player needs penalty points to win a frame, or if either player would need them after the current penalty is applied . This is to prevent the players from running up the score due to repeated misses in worst - case scenarios . </Li> <Li> If the score difference is equal to the number of points still on the table, either before or after the penalty is applied, and the referee believes that the foul was not intentional . This is to prevent the score difference from decreasing too much, at the referee's discretion . </Li> <Li> If it is physically impossible to play a legal shot . The player must still put sufficient strength into the shot so that the cue ball would be able to reach its target if it were not obstructed . </Li> </Ul> <Li> If either player needs penalty points to win a frame, or if either player would need them after the current penalty is applied . This is to prevent the players from running up the score due to repeated misses in worst - case scenarios . </Li>

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