Pinan Yondan
The Pinan kata were introduced into the school systems on Okinawa in 1895, and were subsequently adopted by many teachers and schools in the 1900s. Thus, they are present today in the curriculum of Shitō-ryū, Wadō-ryū, Shōrin-ryū, Kobayashi-ryū, Kyokushin, Shinki-Ryu, Shōrei-ryū, Shotokan, Matsubayashi-ryū, Shukokai, Shindo Jinen Ryu, Kosho-ryū Kempo, Kenyu Ryu, and several other styles.
One of the stories surrounding the history of the Pingan kata claims that Itosu learned a kata from a Chinese man living in Okinawa. This kata was called “Chiang Nan” by the Chinese man. The form became known as “Channan”, an Okinawan/Japanese approximation of the Chinese pronunciation. The original form of the Channan kata is lost. Itosu formed 5 katas from the long Channan Kata which he thought would be easier to learn. Funakoshi modified the Pinan forms on Heian forms, introducing his version of Kushanku (actually renamed Kanku Dai). The 5 kata were Pinans Shodan, Nidan, Sandan, Yondan, and Godan.