Hyoho Niten Ichi Ryu is the sword school of the well known Japanese
Swordsman Miyamoto Musashi (1584-1645). Niten Ichi Ryu means "two
heavens under one school," which closely relates to the forms using
both a long and short sword; for which the school is famous.
Niten is koryu (old school), and its deeply rooted in the Go Rin
No Sho (the Book of Five Rings, written by Musashi), and in Buddhism.
Practice is waza (form) based with two partners. The partners
first bow to each other to show their respect, and then they engage
each other. Niten waza involve one student taking the place of
shidachi (Musashi) and the other student taking the place of uchidachi
(an attacker). Uchidachi would approach shidachi and attack.
Niten is a combative art and students will strike each other with
bokuto. Shidachi will perform the technique thus defeating
uchidachi.
As is mentioned in the Go Rin No Sho, it is best not to get overly
familiar with one weapon. Students of Niten Ichi Ryu train first
with a long sword, then with both a long and short sword, and finally
with a short sword alone. In all of these techniques they will be
attacked by an opponent using a long sword. All swords used in
Niten are wooden. Some feel that this takes away from the reality
of the art, but Miyamoto Musashi himself gave up the use of a live
blade for a bokuto, and since Niten is a combative art wooden swords
reduce the chance of serious injury.
Kage Ryu
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http://www.hyoho.com/Nkage1.html