The great 2 vs 3 knuckle debate.
If you've not read Jack Dempsey's 'championship fighting', please do so before responding on this thread. It's linked on bullshido, search and find it :)
Basically this thread revolves around the pros/cons of punching with the lead two knuckles vs the bottom three.
Let me begin with some of my punching experience and why it pertains to this particular question. First off I came from a TKD/karate/kickboxing school where we did 2 minute sparring rounds (no points). The TKD I learned seems more like karate to me. This is probably because my old instructor was higher belted in American Karate than he was in TKD at the time. Anyways... we learned effective techniques (comparable to the tippy-tappy shite I see from 'tkd') of kicking through, punching through, hitting with power, etc.
The rule was always "punch with the lead two knuckles" and for years I did this. Not knowing any better as a teen, I punched the punching bag without bag gloves. Usually until my knuckles bled. I thought this was cool. We had the same wavemaster punching bag in my basement at my dad's old house so I did it at home very frequently.
Over the years I learn about bone conditioning and begin banging my hands off all manner of hard surfaces.... desks, walls, doors, refridgerators, etc.
Anyways, step forward a few years and I'm doing some stick sparring. I catch one right in the middle knuckle on my right hand. My middle knuckle turns purple. I chipped a bone in my knuckle. Well lo and behold now every time I was hitting everything it would make my hand swell up. So I switched to the 3 knuckle method and found it not only prevented me from injuring that area but allowed much more solid strikes for me. While I like striking both ways, I think after giving both their due I found that the bottom three worked best (for me). Then I read dempsey's book about a year ago and used that to refine it further. I'm definitely satisfied with the results. Now if only I could do that with my crap-tacular judo.
I guess where I'm going is, let's debate this. Pros and cons. Maybe tell some stories. I dunno. I'm down for something new in strikistan other than "how do footwork?" and "how can I start to enjoy being hit in the face?"
Pros of 3 knuckles that I can see:
Better wrist alignment
Better distribution of force across your fist to reduce potential injury
Cons of 3 knuckles that I can see:
More knuckles = more stuff that can break
slightly reduced range vs two knuckle system (like what, a 1/4 inch?)
Trainers might 'disagree' with using it since it's not how many were taught (at least in my experience).