Among them are: the Korean martial art of hapkido founded by Choi Yong-sool, who claims to have been trained under Takeda Sokaku; Choi gave two versions of his story, one in 1962 and another completely different one in 1982.
Blandt dem kan f.eks. nævnes de følgende: Den koreanske kampkunst hapkido, grundlagt af Choi Yong-sool, som anfører at have trænet under Takeda Sokaku; Choi har fortalt to versioner af dette - én i 1962, og en helt anden i 1982.