what are the most effective places to aim for a knockout?

[Salty]

You can't build muscles over your ribs or temple either! Idf you see someone who is really ripped, there is an area left where you can see their ribs on the side. Hit them there with your body shots if you can. Solar plexus is hard to get. You can't build muscle there but you can build muscle around it making it a smaller target. I like hitting people in nose too to affect their morale, and between eyes if they guard their chin and temple well.

You have to be pretty weak to drop from a shot to the ribs, unless of course you get hit with a beauty. I saw one sparring clip of two pros (can't remember who they were) and one threw an hard straight right just above the floating rib. The noise it created on impact left me feeling sick, the guy just feel over and started spewing. I would not have wanted to been him at that moment.