To answer the question in the video - YES - that's what knives are designed for. and the rapid mince he's doing by "vibrating" the cantilever of the knife (holding tip and rear of spine and using the weight of the handle as a counter-weight for rapid mince) - very common and usually done better with a J-Knife, as forged ones are just a lot more heavy.
The sani biard he is using is a cheesy 1/2-5/8" thickness; The ones we use are 3/4" and they are heavy beasts.
You have to remember that he's just cutting a green leafy herb, very soft - Not pounding the knife into the cutting board. If he did the exact same work on a counter, marble, stainless-steel, etc... that knife would be destroyed.
But wood, sani-tough boards - very forgiving.
The only thing a sani-tough board is good at eating an edge is of you slice on it. I had to cut a bunch of thinly-sliced fish, between two sheets of parchment paper, into 2"x8" rectangle serving sizes.
(My knives are literally the sharpest in the kitchen, and in any kitchen I have ever worked in short of the Korean sushi place, anyway.... I get all the detail jobs.)
My knife would slide through the fish and both pieces of paper with ease, for the first few cuts, then I had to adjust my slicing angle slightly up, then down, as the friction to the sani-board just ate my ultra-sharp edge.
Impact to the board and normal use, not a problem. Medium-high-pressure friction on a long slice cut (dragging the edge of your blade for ten inches a hundred times or so) - knives don't like that very much.
Quote:
Originally Posted by
redzuk 
I've never used a really good knife, trying to get an idea how gentle you have to be with them.
http://www.youtube.com/watch?v=ki9KErH1oEY
The guy did pretty a good job on the parsley but would that kill a super sharp knife, would you ever use the technique of holding the tip and chopping down? Or what about bouncing it from the tip to the heel like that? Whats the toughest Japanese knife? Would you even fear working on a rubber board like that one?
Parsley and garlic are two things I would chop like that, also two of the things I wouldnt mind chopping in the food processor.