OK
I really have to know this so i would appreciate the replys.
I know a punch to the jaw can possibly ko your opponent.

My question is
excactly what part of the jaw must be struck and what angle must it be struck at to break someones jaw
and what part of the jaw can be hit to just ko him.
I dont want to break anyones jaw cause of the law suit, but a ko would be needed.
So excactly what part must be hit to break it?

Right. Well the bottom line is that if you hit the jaw anywhere hard enough it might well break. Too high is less effective as the impact is likely to be spread onto the cheakbone (which could in itself smash),too low nearer the point of the jaw and the impact is likely to be spent in sliding off and across the jaw to ensure a break. That leave the spot right in the middle at the bottom of the curve which to my mind is plumb. Two additional factors should be noted. Firstly, the size of your fist is likely to mean that a relatively large area is hit anyway, so specific targeting is a bit moot and secondly, when the mouth is open you are much more likely to break the jaw, often around the hinge area.
Moving onto the issue of KO. This is a much more elusive commodity than people think and ensuring that you achieve one is not always easy. The aim as you may know is to achieve "brain shake" whereby the brain, which is suspended in fluid in the skull is made to collide with the interior of the skull. This causes neural overload and KO results. The best way to bring about this state of affairs is to strike as near to the point of the jaw as possible without expending your power by sliding off. It should be noted that strikes from the side (hooks etc), to the jaw tend to make the opponent fall in the same direction as that from which the hit came. This may result in a head connecting nastily with a hard object such as the pavement. A harder but more skilled strike is over the top and down onto the jaw which can cause the opponent to virualy sit down, thus lestening the chance of subsidiary head injury. Hope this helps.

Regds
Mr V

Note: If opponent fights with open mouth, may result in tongue injury. Specific techniques have specific angles and effects; Uppercut- Whiplash. Being jaw bone also -selection of hand form ie; hammerfist, palm ,backfist,ect. Maybe one is optimum which you want to concentrate on. Also would a penetrating, or a shocking, or a vibrating, be more likely to produce knockout?

Also some use multiple rings , like semi-legal knuckles (I think that swollen hands with rings on is a bad thing) would increase likelihood of knockout.

Mr. V sort of made this point, but my study has shown that hits which TWIST the head, rather than knock it in a straight line, are more effective at KO ing an opponent. This is because the brain is suspended in fluid. When you twist the head quickly, the skull moves faster than the brain, causing a lot of shock when the brain catches up. (suspend something in a jar of water, then twist the jar.) Also, it twists the spinal column, which adds to the "shock" to the nervous system. Straight shots can achieve KO, but require far more force to do so.

Unless its a straight shot square to the chin. Ko everytime if you can hit it properly.

IMOH you cannot say KO every time to any technique. I've seen people hit by real beauties and not go down. Sure they may not look too steady on their feet but its not a straight KO. Similarly ive seen people just tapped who go down like a lead balloon.

Regds
Mr V

Yeah!!!

The over hand right to the button, folding them down (as Mr V says)

Sigh!!!!!!!!! I have lost count...

Even the ones that you mange a horizontal push with, so the head turns as the chin is pushed into the chest......

With the impact memory loss, they actually dont know what has hit them....

Lovely

Mark

Ok not ko EVERY time but alot of the time any ways and for the times it doesnt then they are usually dazed anyways and a follow up attack should at least put them on the ground.

Also I think there are a few techniques you could say ko to everytime, Mr.V. Example the stepping side kick to the chin. I dont see anyone standing up to that. Or a ridgehand to the brain stem. Potentially fatal so I think a ko would be easy to accomplish. Triangle chokes. Some will work every time IF correctly applied and the impact is solid.