| 1 | 
                    
                        
            Once he's protected his stuff so that you can't cost-efficiently kill it with raiders, you make something else that can kill it.  Just like with any unit, try to counter what your opponent has.  In high level 1v1s sometimes they never transition out of raiders, because the raiders never stop being able to get damage done.  (Once you transition "out of raiders" you still want to have some raiders at least for defense against his raids or to protect your artillery.)
                     | 
                    1 | 
                    
                        
            Once he's protected his stuff so that you can't cost-efficiently kill it with raiders, you make something else that can kill it.  Just like with any unit, try to counter what your opponent has.  In high level 1v1s sometimes they never transition out of raiders, because the raiders never stop being able to get damage done.  (Once you transition "out of raiders" you still want to have some raiders at least for defense against his raids or to protect your artillery.)
                     | 
                
                
                    | 3 | 
                    
                        
            Against 
            a 
            computer 
            the 
            situation 
            is 
            different 
            because 
            the 
            AI 
            will 
            constantly 
            attack 
            with 
            small 
            groups 
            of 
            raiders 
            through 
            any 
            gaps 
            in 
            your 
            defenses.
             
             
            This 
            requires 
            super 
            micro 
            on 
            the 
            AI's 
            part 
            that 
            most 
            humans 
            can't 
            do.
             
             
            To 
            beat 
            AIs,
             
            a 
            fairly 
            reliable 
            way 
            is 
            to 
            build 
            up 
            static 
            defenses 
            everywhere 
            so 
            it 
            can't 
            raid,
             
            then 
            push 
            out 
            with 
            skirmishers 
            and 
            artillery 
            while 
            building 
            more 
            defenses 
            to 
            secure 
            your 
            advance.
                     | 
                    3 | 
                    
                        
            Against 
            a 
            computer 
            the 
            situation 
            is 
            different 
            because 
            the 
            AI 
            will 
            constantly 
            attack 
            with 
            small 
            groups 
            of 
            raiders 
            through 
            any 
            gaps 
            in 
            your 
            defenses.
             
             
            This 
            requires 
            super 
            micro 
            on 
            the 
            AI's 
            part 
            that 
            most 
            humans 
            can't 
            do.
             
             
            To 
            beat 
            AIs,
             
            a 
            fairly 
            reliable 
            way 
            is 
            to 
            build 
            up 
            static 
            defenses 
            everywhere 
            so 
            it 
            can't 
            raid 
            (
            while 
            taking 
            as 
            much 
            territory 
            as 
            you 
            can,
             
            don't 
            stay 
            at 
            your 
            base)
            ,
             
            then 
            push 
            out 
            with 
            skirmishers 
            and 
            artillery 
            while 
            building 
            more 
            defenses 
            to 
            secure 
            your 
            advance.
                     |