Po Eun
Po Eun is a combination of the three Naihanchi/Tekki kata. Many styles practice only the first, as the 2nd and 3rd were developed much later. Choi lists them in his 1965 book as "TET-KI PATTERN" I - III. Po Eun moves in the same sideways manner, repeating movements on both sides, and combines some movements from all three patterns together.
The following videos were used as reference:
ITF Legacy performance of Po Eun.
Hirokazu Kanazawa performing Tekki Shodan, Tekki Nidan, Tekki Sandan, Jion, Gojushiho (Shotokan).
It must first be understood that the majority of movements in Po Eun are disconnected and out of sequence from how they originally appeared in the Naihanchi/Tekki kata. However, it is obvious that they are the origin of Po Eun.
As an interesting note, Choi's 1965 directions for Kushanku mention the "Heaven Hands" ready position as the same as Po Eun, but not Kwang Gae, perhaps not wanting to draw attention to the identical opening of the two.
Po Eun opens to the left with a middle guarding block.
Tekki Nidan opens to the right with a twin elbow, then a guarding block.
Po Eun's next movement is seen in Jion, which is mentioned in 1965, but this could be coincidental.
Po Eun does two kicks, landing in a sitting stance executing a knife hand strike, then an angle punch.
Shodan contains a high stomp, lands in the stance with a backhand, then elbow, then an angle punch in the opposite direction.
Po Eun does a series of blocks and punches while maintaining the stance, similar to the opening of Tekki Sandan.
Sandan contains another sequence that matches the first two images of Po Eun, seen again in the opening of Choong Jang.
Po Eun ends this sequence with a horizontal punch, a technique seen in Tekki Shodan.
...then does a sequence resembling this piece of Tekki Nidan.
Po Eun ends in a position seen in a sideways-stepping section of Gojushiho.
