Isshinryu is a relatively new style of Karate, created by Tatsuo Shimabuku in 1956. Its differences from mainstream karate spring from the eight Codes of Karate, created by Shimabuku, which are still strictly followed:

1. A person's heart is the same as Heaven and Earth
2. The blood circulating is similar to the motion of the moon and the sun.
3. A manner of drinking and spitting is either hard or soft.
4. A persons unbalance is the same as a weight.
5. The body should be able to change directions at any time.
6. Strike when opportunity presents itself.
7. The eye must see all sides.
8. The ear must listen in all directions.

All this leads to a fighting style that is more streamlined and effective for self defense that most other Do, or fighting art oriented styles of karate.