Competitive balance (CB) comparisons indicated by the application of a new measure over results for Australian Football League (AFL) and National Rugby League (NRL) matches from 1897 to 2012. LentenLiam 2020 Competitive balance (CB) comparisons indicated by the application of several different measures including a new measure, the mobility gain function (MGF), over results for Australian Football League (AFL) and National Rugby League (NRL) matches from 1897 to 2012.