Pinan Yondan is the fourth Kata from the series. According to Kazumasa Yokoyama sensei, Pinan Yondan is an advanced version of Pinan Shodan. I have heard on many occasions from different instructors that apparently Ohtsuka sensei would always ask a student to show Pinan Yondan during a grading.
Pinan Yondan, the fourth Kata from the series of five emphasises Meotode, Nagasu and Irimi. Kake uke is in Pinan Yondan, as opposed to Kake uke from Chinto, Jitte and for example Niseishi executed as Morote Uke in a somewhat forward movement. Especially the second Kake Uke involves forward movements, which is called Nusumi ashi, meaning to steal the distance.
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Hirate Uke from Pinan Yondan and Kushanku can be used more or less directly in combat. It's proven effective against a front kick as well as stabs. Here's an application that closely resembles the Kata.