Interesting you should bring this point up. I teach tate tsuki (vertical fist) in a 'traditional' school because I can produce greater power in the punch and the bone structure of the arm is in a stronger alignment than with the rotated fist (seiken). My understanding of the rotated fist is that it was originally used with the second knuckle extended (nakadaka ippon ken) to provide a tearing effect on underlying tissues. Another bonus is that tate tsuki can be delivered with full force with a broken thumb or index finger. :asian:The whole idea is not to blindly follow karate and let it restrain you. There are many things in karate I felt weren't effective for me like rotating a punch when I can deliver a much harder strike with a vertical fist. I can't assert that the vertical fist is more powerful, it just works better for me. This is why I needed to go shopping for new tools.