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Kid's, go play outside ... this ain't for you!
What does Ikken Hissatsu mean? 'To kill with one blow.' This is a controversial topic and there's a whole lot of stuff on the internet about it. This is just my personal take.
First up, let me make it quite clear that I do not believe such a concept belongs in today's Western dojo's, especially where there are children students, for obvious reasons. For them, the more apt concept to follow would be, 'Kisshu fushin.' The literal meaning of this is, 'Demon’s hand, saint’s heart.' It's the peaceful warrior concept; a peaceful person on the outside, refraining from violent behaviour, and a warrior on the inside, with the mental toughness to handle life's problems with courage, honour and dignity.
My argument here is that true karate-dō can be nothing else but Ikken Hissatsu. Why? There are many reasons, but here's three that I'll offer here, now:
As an example of what it takes for karate-dō to be effective, take a look at the video clip 'Jiu-jitsu vs Karate' linked at the foot of this post, which personally, I don't find at all conclusive (it's not my intention to pit one martial art against another here), but merely farcical. And here's why.
The rules of engagement meant that the jiu-jitsu guy could use his techniques to their fullest extent, whereas the karate-ka couldn't. Because, if he could have, and was good enough, the jiu-jitsu guy would have indeed (arguably) still have ended up on the floor, not in control of the fight but in serious trouble. For the karate-ka in this video clip, it would be similar to sending a soldier to war with a rifle and giving him a pack of dried peas for ammo.
The other important point here is that the jiu-jitsu floor techniques are highly effective against a single opponent, but not if you're facing off against two or more. That's where a striking art like karate comes into its own. As long as you can stay on your feet and deploy your weapons effectively, you stand a fighting chance.