Go Rin No Sho : The Book of Five Rings
One of Japan's great samurai sword masters penned in decisive, unfaltering terms this certain path to victory, and like Sun Tzu's The Art of War it is applicable not only on the battlefield but also in all forms of competition.
Always observant, creating confusion, striking at vulnerabilities--these are some of the basic principles.
Going deeper, we find the interval of vulnerability, of indecisiveness, of rest,
the briefest but most vital moment to strike.
In succinct detail, Miyamoto records ideal postures, blows, and psychological tactics to put the enemy off guard and open the way for attack.
Most important of all is Miyamoto's concept of rhythm, how all things are in harmony, and that by working with the rhythm of a situation we can turn it to our advantage with little effort.

Miyamoto Musashi,
also known as Shinmen Takezoo, Miyamoto Bennosuke,
or by his Buddhist name Niten Dooraku,
was a Japanese swordsman famed for his duels and distinctive style.
Musashi, as he is often simply known,
became legendary through his outstanding swordsmanship in numerous duels,
even from a very young age.
He is the founder of the Hyoohoo Niten Ichi-ryuu or Niten-ryuu style of swordsmanship
and the author of The Book of Five Rings (Go Rin No Sho),
a book on strategy, tactics, and philosophy that is still studied today.

you can read the book here:
http://www.uvm.edu/Strategy Books/Book of Five Rings - Musashi.pdf