Just to add to the query I got the tetsui answer for your question from Frank Brennan. there is a video of him somewhere on the net of him throwing a kazami zuki straight but as he gets right close whollops the feela to the face.

Both left foot foward
Brennan left kazami
last minute tetsui to opponents left side jaw
good night
Oss

i should have not tied that in with a kick analogy...just confused the question.

just to reiterate

if you do a straight reverse punch 1000 times(targets center of face)
now a roundhouse punch jodan punch 1000 times
(targets one side of jaw joint)
now same punch 1000 times but target side of face/jaw joint

djb-....the two little knuckles are vunerable but thats not what i was pressing my force/mass into, i was torquing my wrist to press the first two knuckles into my imaginary figure (and it does feel like a hammerfist but i never thought of that, thanks!) I added the snap to it and i likey.

roundhouse punch was taught by Nakayama here
http://www.youtube.com/watch?v=CMW7oxUt4dc
i really like Nakayama's teachings

my poor reference to inside roundhouse kick came from here-Tanaka himself taught me in dojo
http://www.youtube.com/watch?v=4JsTx5V5ZzY&feature=PlayList&p=6BCB5E22D927F4E2&playnext=1&playnext_from=PL&index=90

Hi Brinn

I'm all for experimenting with techniques. I have thought about your question and can see what you are trying to acheive. The only way I can see of hitting like a punch but from the opposite side is by punching across the front of my body (for example right fist moving across to left side) but by turning the body slightly in the opposite direction (left shoulder back), and inverting the fist this allows the punch to come back on itself to the centre line and impact with the right side of your opponents face with fore knuckles as a normal punch would. It looks like an Uchi Uke used as a strike to the face.Not a very strong punch I admit and requires some flexibility in the arms but hey, it wouldn't half make them think where did that come from !!!!

oss i suppose the technique would be a tetsui hammer fist, like that jus before the first kiai in h.sandan. A word of caution though a classical linear punch using the smallest knuckles of the fist e.g middle,ring and little (wing tsun) will almost certainly BREAK them (trust me, iv did it). make sure a zuki is seiken, tetsui is external ridge. the only time we use wing tsun is during meikyo and even then it is a snap rather than a bulldoze, to the already weak eyes. so to answer your question (from my point of view) i dont think our bodies are capable of an "uchi zuki" or "ura mawashi zuki" but tetsui, uraken and shuto all work internally. oss.

It seems to me that body mechanics won't allow the front of the fist to be used at that angle (at least mine don't!). The only decent "fist" techniques that come to my mind from that angle are the hammerfist, backfist (as you mentioned), and sidefist (thumb knuckle).

Hey brinn,

confusing question
I believe problem is quite perverse

There is a straight kick mae-geri, outside round house mawashi-geri and inside round house ura-mawashi-geri. You come from this and I think that's the problem. Because... Ura-mawashi-geri has only this name. In fact it's rather a hook kick than a roundhouse one While regular mawashi-geri has its output in roundhouse move, ura-mawashi-geri begins with a bit yoko-geri's (side kick) output and ends just with a foot's hook.

It's really hard to imagine how an inside roundhouse punch should look like. When I visualize it I see only tetsui-uchi. And in this shape you have this punch in Heian Nidan (first stance, the last technique). It's tetsui I think but e.g. we perform it a bit more like zuki and in bunkai we use zuki instead of tetsui. It's just something between.

You have also ura-zuki, like this in Tekki Shodan - a straight hook punch from the bottom. You have also haito-uchi lead from inside of your body (not outside as usual). Anyway, haito-uchi isn't a fist punch.

Finally, e.g. we hardly use mawashi-zuki. And I think that mawashi-zuki can be replaced by kagi-zuki - a hook punch to the side, like in Tekki Shodan and Heian Godan.

So now we can go back to the beginning of my comment and emphasize that inside roundhouse kick it's just a hook kick I hope I wrote clear enough.