To try to decrease the chances of requiring kicks from the penalty mark, the IFAB, the world law making body of the sport, experimented with new rules. The golden goal rule transformed the overtime periods into sudden death until the periods were over, where shootouts would occur. As this became unpopular, the silver goal rule was instituted, causing the game to end if the scores were not equal after the first 15-minute period as well as the second. The silver goal has also fallen into disrepute so UEFA Euro 2004 was the last event to use it; after which the original tie-breaking methods were restored.