Ka kammala wannan magana: Da farko, gasar ta ƙunshi ƙungiyoyi takwas da aka raba zuwa rukuni biyu, waɗanda suke yin wasa a zagaye. Manyan biyu daga kowane rukuni sun yi wasa don zinare, kuma farawa a cikin 1999 ƙananan biyu sun yi wasa don ƙayyade sanyawa da saukewa. A cikin 2004, 2007, 2008, da 2009 an buga gasar tare da kasashe tara, ta amfani da rukuni uku na uku suna wasa zagaye-zagaye. A cikin wannan tsari na farko daga kowane rukuni ya ci gaba da wasa don zinare, wuri na biyu daga kowane rukuni ya yi wasa don sanyawa da kuma damar da za a ci gaba da wasa don tagulla, kuma ƙungiyoyin na uku sun yi wasa don tantance faduwa. Farawa a cikin 2011, gasar ta canza tsari don ƙarfafa wasanni mafi daidaito. Manyan kasashe huɗu da suka taka rawar gani sun buga a Rukunin A, inda manyan ƙungiyoyi biyu suka sami damar zuwa wasan kusa da na karshe, ƙananan biyu sun tafi wasan kusa da na karshe don fuskantar manyan biyu daga Rukunin B. Ƙananan biyu daga Rukunin B sannan su buga juna a cikin mafi kyau na uku don tantance sauka. Farawa a cikin
2019 an fadada gasar zuwa kungiyoyi goma, tare da kawo sabon tsari. An rarraba ƙungiyoyi goma zuwa rukuni biyu na biyar kuma suna wasa zagaye-zagaye. A cikin wannan tsari, ƙungiyoyi biyar a cikin Rukunin A da manyan ƙungiyoyi uku daga Rukunin B suna motsawa zuwa Quarterfinals, A1vsB3, A2vsB2, A3vsB1, da A4vsA5. Ƙananan biyu daga Rukunin B yanzu suna wasa ne kawai na 9 kuma duka biyu suna saukewa. Ya zuwa 2021, ƙungiyoyi huɗu da suka rasa wasanninsu na zagaye na huɗu sun shiga gasar fitarwa don tantance matsayi na 5 tare da wanda ya ci nasara ya sami wuri a Rukunin A don gasar ta gaba.