There are marked differences between the Heian Nidan of Shotokan and the related Pinan Shodan katas of other styles. Some of them may be clues to applications, so it is good to be aware of them. There are also some small differences in the katas performed by different branches of Shotokan. Again, traditional Shotokan senseis become agitated if you do the kata as it is taught by their rivals. (See Standard Lie #3.)
Step 1-6: Opening "double-block" cluster. Allowing for stylistic differences such as using cat stance instead of back stance, almost everybody does this cluster the same way:
- Sugiyama's group (Shotokan)
- Ertl and Bendickson (Shotokan)
- Nakayama's JKA (Shotokan)
- Modern JKA (Shotokan)
- Gichin Funakoshi's students, films from 1924 (Shotokan)
- Kenneth Funakoshi's group (Shotokan)
- Kanazawa's group (Shotokan)
- Nagamine's Matsubayashi Shorin Ryu
- Gillespie's Seito Shorin Ryu.
- McGuiness's Seito Shito-Ryu
- Tomiyama's Tani-ha Shito-Ryu
- Wado Ryu
- Yamazaki's Robukai
The exception is the shotokai group, which turns step 3 and step 6 into oi-zuki by shifting forward in an extended front stance:
Step 7-8: Side-snap kick and uraken-uchi. Only Shotokan does the side-snap kick and uraken-uchi. (For this discussion, Robukai and Shotokai are treated as branches of Shotokan.)
- Sugiyama's group (Shotokan)
- Ertl and Bendickson (Shotokan)
- Nakayama's JKA (Shotokan)
- Modern JKA (Shotokan)
- Gichin Funakoshi's students, films from 1924 (Shotokan)
- Egami's group (Shotokai)
- Kenneth Funakoshi's group (Shotokan)
- Kanazawa's group (Shotokan)
- Yamazaki's Robukai
Non-Shotokan styles all do a front-snap kick instead of side-snap kick, and extend the arm in what looks like a hammerfist or even a downblock:
Except for Wado Ryu and Shito Ryu, which have the front-snap kick combined with an inside block:
Step 9, 10, 12-15: Knife-hand strikes with hiki-te over the solar plexus (like modern Shotokan):
- Sugiyama's group (Shotokan)
- Ertl and Bendickson (Shotokan)
- Egami's group (Shotokai)
- Nakayama's JKA (Shotokan)
- Modern JKA (Shotokan)
- Kenneth Funakoshi's group (Shotokan)
- Kanazawa's group (Shotokan)
- Gillespie's Seito Shorin Ryu.
- McGuiness's Seito Shito-Ryu
- Tomiyama's Tani-ha Shito-Ryu
- Wado Ryu
- Yamazaki's Robukai
Knife-hand strikes using old-style two-hand swing (no hiki-te):
Step 11: Nukite, pressing block (typical Shotokan):
- Sugiyama's group (Shotokan)
- Ertl and Bendickson (Shotokan)
- Nakayama's JKA (Shotokan)
- Modern JKA (Shotokan)
- Gichin Funakoshi's students, films from 1924 (Shotokan)
- Egami's group (Shotokai)
- Kenneth Funakoshi's group (Shotokan)
- Kanazawa's group (Shotokan)
- Gillespie's Seito Shorin Ryu.
- Yamazaki's Robukai
Nukite, but no pressing block:
It looks like the pressing block has been added to the Shotokan branch. Other groups don't do it.
Step 16: Extend arm to right, then swing horizontally across body and return as reverse-hip uchi ude uke:
- Ertl and Bendickson (Shotokan)
- Nakayama's JKA (Shotokan)
- Egami's group (Shotokai)
- Kenneth Funakoshi's group (Shotokan)
Full 360 arm swing (exaggerated circular swing compared to most modern Shotokan):
No arm swing, just minimal stackup before reverse-hip uchi ude uke:
- Sugiyama's group (Shotokan)
- Modern JKA (Shotokan)
- Nagamine's Matsubayashi Shorin Ryu
- McGuiness's Seito Shito-Ryu
- Tomiyama's Tani-ha Shito-Ryu
- Wado Ryu
- Yamazaki's Robukai
Left inside block, normal hip position, right gyaku zuki:
Step 16-21: Block/kick/punch clusters with reverse hip position (typical Shotokan):
- Sugiyama's group (Shotokan)
- Ertl and Bendickson (Shotokan)
- Nakayama's JKA (Shotokan)
- Modern JKA (Shotokan)
- Gichin Funakoshi's students, films from 1924 (Shotokan)
- Egami's group (Shotokai)
- Kenneth Funakoshi's group (Shotokan)
- Kanazawa's group (Shotokan)
- Nagamine's Matsubayashi Shorin Ryu
- McGuiness's Seito Shito-Ryu
- Tomiyama's Tani-ha Shito-Ryu
- Wado Ryu
- Yamazaki's Robukai
No block, reverse punch, front kick:
Step 22: Reinforced block
- Sugiyama's group (Shotokan)
- Ertl and Bendickson (Shotokan)
- Nakayama's JKA (Shotokan)
- Modern JKA (Shotokan)
- Gichin Funakoshi's students, films from 1924 (Shotokan)
- Egami's group (Shotokai)
- Kenneth Funakoshi's group (Shotokan)
- Kanazawa's group (Shotokan)
- Nagamine's Matsubayashi Shorin Ryu
- McGuiness's Seito Shito-Ryu
- Tomiyama's Tani-ha Shito-Ryu
- Wado Ryu
- Yamazaki's Robukai
Downblock instead of reinforced block:
Step 23-26: Downblock/shuto upblock/age uke clusters (typical Shotokan):
- Sugiyama's group (Shotokan)
- Ertl and Bendickson (Shotokan)
- Nakayama's JKA (Shotokan)
- Modern JKA (Shotokan)
- Gichin Funakoshi's students, films from 1924 (Shotokan)
- Egami's group (Shotokai)
- Kenneth Funakoshi's group (Shotokan)
- Kanazawa's group (Shotokan)
- Nagamine's Matsubayashi Shorin Ryu
- Wado Ryu
- Yamazaki's Robukai
Downblock, no shuto block, step in and upblock:
It is pretty clear that from step 16, Seito Shorin Ryu's Pinan Nidan has been substantially revised.