Structure of Heian Shodan
Heian Shodan is very similar to Taikyoku Shodan, since the latter was, in essence, created as a subset of the former.
It has practically the same embusen of the first Kata, organized in the same pattern: an A-B-A travel with baselines divided into 5 segments. Unlike Taikyoku Shodan, these segments are all distinct.
Segment 1: Gedan-barai Oi-Zuki Baseline (Tettsui variation)
This segment is very similar to the first segment of Taikyoku Shodan. Its most striking aspect is that it is not a mirrored baseline. It starts to the left like Taikyoku Shodan, but the right-side repetition includes an extra technique, a tettsui between the gedan-barai and the oi-zuki. The other baselines of Heian Shodan and most of the Heian Kata are symmetrical, so this one stands out as an exception.
The Heian Kata were incorporated by Funakoshi into his syllabus as his version of Itosu's Pinan Kata, but these have…