what is the different between Rating and ACS

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Acs = average combat score. Its all damage you dealt devided by rounds played nothing more. Doesnt matter if thr damage got you a kill or aassist. Doesnt matter if you got the firt or last kill. Doesnt matter if you clutched.

Rating is a complex system by vlr wich is not easy to calculate and it includes stuff like kills, assists, clutches, first kill and more