 In English rugby union, the format is currently used to determine the winner of the Premiership, and from 2012–13 through to 2016–17 was also used in the second-level RFU Championship to determine the team to be promoted to the Premiership.The Premiership and Championship formats differ only in the number of games contested—the Premiership playoff uses one-off matches, while all matches in the Championship playoff were two-legged.The Premier 15s, launched in autumn 2017 as the new top flight of English women's rugby, uses the same playoff format as the Premiership.