In 1970 , Gimnasia y Esgrima finished second the zone `` B '' behind Chacarita Juniors , and qualified to the `` Nacional '' semifinal against Rosario Central , who had occupied the first position in the zone `` A '' . In 1970 , Gimnasia y Esgrima finished second the zone `` B '' behind Chacarita Juniors , and qualified for the `` Nacional '' semifinal against Rosario Central , who had occupied the first position in the zone `` A '' .