Fusen was a school of Jiu-jitsu which specialized in Ground Work (Ne Waza). In 1900, the Kodokan challenged the Fusen Ryu school to a contest. At that time Judo did not have Ne Waza (ground fighting techniques), so instead they fought standing up, as Kano had been taught in both the Tenshin Shinyo Ryu and Kito Ryu systems he studied. Both Kito Ryu and Tenshin Shinyo Ryu had excellent striking skills and effective throws.
When Kodokan Judo practitioners fought the practitioners of Fusen Ryu Jiu-Jitsu, the Kodokan practitioners realized that there was no way they could defeat the Kodokan Judoka standing, thus they decided to use their superior ground fighting skills. When the Kodokan fighters and the Fusen Ryu men began to fight, the Jiu-Jitsu practitioners immediately went to the guard position ( lying on their backs in front of their opponents in order to control them with the use of their legs). The Kodokan Judoka didn't know what to do, and then the Fusen Ryu practitioners took them to the ground, using submission holds to win the matches. This was the first real loss that the Kodokan had experienced in eight years.
Kano knew that if they were going to continue challenging other Jiu-Jitsu schools, they needed a full range of ground fighting techniques. Thus with friends of other Jiu-Jitsu systems, among them being Fusen Ryu practitioners, Kano formulated the Ne Waza (ground techniques) of Kodokan Judo which included three divisions: Katame Waza (joint locking techniques), Shime Waza (choking techniques), and Osae Waza (holding techniques). This all occurs shortly before Judo arrives in Brazil, and serves as an excellent suggestion as to why Brazilian Jiu-jitsu contains a higher percentage of techniques on the ground than most styles of Jiu-jitsu or Judo. Thus, we find ourselves faced with the impending development of Jiu-Jitsu in Brazil.