'Desperate Dan' jaw and Knockouts

Apart from accuracy, does someone who has a big jaw like 'Desperate Dan', make them harder to knockout, and for that matter does the same apply if someone has a 'Bull-neck'.

Depends on the type of knock-out, I would guess.

Hitting the side of the jaw, as with a hooked punch, creates a spinning of the skull around the brain and actually results in a twisting of the brain stem rather than the "shaking of the brain" theory that is commonly described.

If this IS the case, and I'm no doctor here, then theoretically, a large "desperate dan" type jaw should give you more leverage in which to spin the skull.
Also a nicer larger target to aim at

I'd asy someone with a well built, "bull neck", is more a concern as this helps to prevent the skull from rotating and shaking in a "detatched" way from the rest of the neck, back and torso.
Similar to the difficulties in knocking someone out who is tense and who is flinching.
This creates a rigid structure that stops the head from shaking.

This is why we talk about engaging the brain and asking the attacker a question and also re-affirming that you don't want trouble, in order to relax them.
Relaxing the attacker prior to hitting them helps ensure a better chance of knock-out as they are more relaxed and less likely to flinch or be tense and rigid.

When they are tense, or have a very muscular neck, their whole body will shake rather than just the head.

So yes, "bull neck" may make knock-outs more difficult, but working the Fence and the distraction techniques properly, then good sharp explosive and accurate punches, at short range with no build up or telegraphing, will also go a long way to helping you get the knock-out.

Cheers Al, some interesting points there.

I recall reading a book about the Krays and it was noted that Ronnie Kray would engage the person in polite small talk and give them a cigarette and offer a light, but instead of offering a light, he hit them with a right which would always break their jaw because as he says they'd had their jaw open through having a cigarette in their mouth, and sure enough they would be relaxed and not percieving a threat, rather a light, and instead BANG !

I was watching a boxing match the other day on the TV and the referee stopped it after the guy was hit with a left on the side of his temple, his feet just went and he was just wobbling, even the commentator remarked how punches to the side of the temple get many a boxer.

Re large neck.. the 'snap' or 'twist' that comes from a correctly angled strike to the jaw, is usually just above the 7th cervical vertebra, which wouldnt be influenced much by neck size, as most neck size is via the 'sterno-cleido-mastoid muscles, which wouldnt stop 'snap'

Lantern jawed, as we used the call them CAN resist hard strikes slightly better, but the amount of benefit they actually get from that is minimal.

Hit the HARD & CORRECTLY, and they will go down