I am very new karate ka and even newer in Bunkai.
I have 2 questions that maybe should have been 2 Threads but anyways, here goes:
1. I like to use the "rules" or principles from Kaisai no Genri, when I analyze katas. The principles are used in Goju Ryu, and they make sence to me even though I study a different school (Gensei Ryu). I would like to hear you thoughts as to what degree the rules are universal and applicable to all schools. Some of the rules are (in my oppinion) obviously universal, but others make me doubt that. Do you think various Masters based their Katas on the same foundation? Do you know of any other set of rules or principles?
2. Kaisai no Genri nor any other source i have seen explains the reason for techniques in Katas being performed slowly. I guess that consensus exists that in a real fight everything is done as fast as possible. My guess is that some katas train, for example, breathing (Hangetsu?) but others make me think.
First technique of Heian Yondan and Heian Nidan is performed exactly alike with the exception of hands being open in Yondan and closed in Nidan, and performed fast in Nidan and slowly in Yondan (at least that is how I do it).
My guess is that the fists and high tempo in Nidan indicate that you strike the opponent with one of the hands (the one closest to your opponent), and that the open hands and slow tempo in Yondan indicates that it is a grappling technique. Maybe you are holding your opponent and throwing him? I am interested in opinions on these 2 katas in particular and also more general thoughts about tempo in Katas.