And occasionally, people on the side of Kodokan judo learned newaza (ground grappling techniques), because Kodokan judo was defeated by Fusen-ryu jujutsu (Fusen school of jujutsu) and others several times with newaza.
逆に、講道館は寝技で不遷流柔術などに何度も負けたため寝技を研究することとなったこともある。