The twenty teams of the championship would all play twice against each other, with the best teams of each half and the two overall best teams qualifying to the Semifinals, and the bottom two teams being relegated. [2][1]
Updated to match(es) played on August 17, 1986. Source: RSSSF.com Rules for classification: 1) points; 2) wins; 3) goal difference; 4) number of goals scored.