Possession (sports) determined by several methods, including a coin flip (American football and cricket), home team status (baseball), or by giving the teams an equal opportunity to physically take possession; this may be called a dropped-ball (association football), a ball-up (Australian rules football), a jump ball (basketball), or a face-off (hockey). In some timed sports, the team with possession may try to "run time off the clock" by keeping the ball and not attempting to score, in order to deny the opposing team possession. A shot clock speeds gameplay by requiring teams to attempt to score within a certain period of time
Safety (gridiron football score) is now slightly more likely after the rule change in 2015 which allowed the defense to take possession and score on a conversion attempt. Before 2015, the only scenario in which a one-point safety could have been scored in the NFL would have involved the defense kicking or batting a loose ball out the back of its own end zone without taking possession of the ball. In college football and the NFL, a conversion safety can also be scored by the defense, though this has never occurred. To accomplish this, the team attempting the try would need to somehow be