I'm learning quite a lot about swords.
I recently found out that a
"Bo-Hi" is not really a
"Bo-Hi" at all !
"Well I never!" I hear you say..
Actually, a "
Bo-Hi" or a
SO CALLED "Blood Groove" (a channel down each side of a Japanese sword blade) was not meant to prevent suction trapping the blade in a body as is commonly thought. It was originally done by the smith:
a) To hide forging flaws and incomplete welding of layers.
b) An attempt to lighten a clumsy/heavy blade
c) An attempt to balance the blade.
I-Ai-Do practicioners
like a sword with a
"Bo-Hi" to practice with as the "groove" produces a whistling/swishing noise when the sword is wielded correctly. This helps them in their "Solo practice" in the "Art of drawing the sword"
However...
"Tameshigiri" practicioners favour a
"Shinogi" blade ! That is a blade without a
"Bo-Hi". Their argument is that
a) A "Bo-Hi" weakens the blade.
b) The groove actually provides more resistance when cutting as there is more surface area.
c) They don't need to hear it whistle.
d) They like the extra weight and a "meaty" blade to provide the "follow through" in a cut.
Those that appreciate blades (i.e. those that are into "hamon" "nie" and "noi" and the beauty of welded metals) also prefer a "shinogi" blade as there is no
"Bo-Hi" cut along it's length to distract from the beauty of the different grains and patterns.
So what's all this gotta do with "Kata" I hear you say..
Well, In my opinion there are two kind of "Kata". One with a "Bo-Hi" i.e. a technically beautifully performed "Kata" and the other a "shinogi" type "Kata" whereby the main focus is on devastation rather than technical correctness. There is an use for both types and in competition, the fancy one with a "Bo-Hi" will always win.
Last night in training I was a "bit annoyed" about things in general and I went a bit over the top when teaching "Kata". I wanted "Bassai-Dai" performed
aggressively and wildly.

I want to
"Feel the effectiveness of Kata"Now don't get me wrong, I appreciate beautifully performed "Kata".
But, I have many swords. One has a "Bo-Hi" and makes a great noise when you wield it. Another is quite chunky, heavy and "Shinogi"
I know which one I would pick up in a
"REAL" swordfight !
After all...Swords are meant for CUTTING ! 