On March 23, 2013, the AIBA instituted significant changes to the format. The World Series of Boxing, AIBA's pro team league whicher AIBA Pro Boxing Tournament, consisting of pros who sign 5 year contracts with AIBA and compete on pro cards leading up to the tournament, also provides a pathway for new pros to retain their Olympic eligibility and retain ties with national committees. The elimination of headgear and the adoption of the "10-point must" scoring system further clears the delineation between amateur and pro format.[3][4]