8 0 s ▁NCAA ▁basketball ▁champions ▁formed ▁the ▁core ▁of ▁the ▁Filip ino ▁team ▁sent ▁to ▁international ▁compet itions ▁during ▁ 1 9 6 0 ▁and ▁ 1 9 6 1 ▁in ▁Japan . ▁The ▁opening ▁of ▁the ▁A ran eta ▁Col ise um , ▁the ▁largest ▁ind oor ▁ar ena ▁in ▁the ▁Philippines , ▁prompt ed ▁the ▁league ▁to ▁transfer ▁the ▁championship ▁round ▁there . ▁ ▁By ▁the ▁ 1 9 6 0 s , ▁the ▁league ▁experienced ▁problems ▁such ▁as ▁el ig ibility ▁of ▁players ▁and ▁inter sch ol astic ▁h ool igan ism . ▁This ▁led ▁to ▁disag re ements ▁among ▁member ▁schools , ▁and ▁as ▁a ▁result ▁the ▁ 1 9 6 2 – 6 3 ▁season ▁was ▁susp ended , ▁and ▁the ▁following ▁two ▁seasons ▁were ▁held ▁in ▁a ▁loose ▁conference ▁format , ▁where ▁the ▁home ▁and ▁away ▁system ▁was ▁used . ▁San ▁Sebastian ▁College ▁- ▁Rec o let os ▁joined ▁the ▁league ▁in ▁ 1 9 6 9 . ▁Tr inity ▁College ▁of ▁Que zon ▁City ▁also ▁joined ▁in ▁ 1 9 7 4 , ▁the ▁league ' s ▁golden ▁anni versary , ▁according ▁to ▁newsp apers ▁and ▁other ▁publications ▁of ▁that ▁year . ▁( However , ▁the ▁NCAA ' s ▁official ▁website ▁states ▁that ▁Tr inity ▁joined ▁the ▁league ▁in ▁ 1 9 8 5 ; ▁see ▁next ▁section .) ▁ ▁After ▁the ▁ri ot ous ▁games ▁of ▁the ▁late ▁ 1 9 7 0 s , ▁several ▁of ▁the ▁found ing ▁members ▁left ▁the ▁league