In chess ACPL roughly works like goals scored (conceded) in football. Goals are made when the defending team makes mistakes. A team that is a master of defense

In chess ACPL roughly works like goals scored (conceded) in football. Goals are made when the defending team makes mistakes. A team that is a master of defense will concede few goals. But will also score few goals since defending well requires playing cautiously. Its the same with attacking, aggressive teams. They both score and concede more goals than the average.