if i may be of some assistance,
build a back turret and spam flamers. you don't even need hogs if you don't want them. (use hogs if you are anders)
with flamers and a turret you will be save for the first 3 min of the game.
spam flamers and another couter unit, if he has hall, dual pump flamers. a summit, hogs and flamers. a factory, tanks and flamers or hornets if you are feeling bold.
key thing against a chieftan is flamers.