A comment by Chris Parker prompts this question... I know that some arts have been created specifically to counter other arts. For example, I know there is a jo or short stick system that was created to counter Miyamato Musashi's sword style. (Forgive, the names are escaping my memory, nor do I know if either is considered koryu; they're just examples.) And Chris suggests that there are elements in various koryu aimed at countering each other. Anybody willing and able to share some examples, either of koryu arts aimed at countering other koryu arts or simply elements?