Choong Moo
Choong Moo, like Hwa Rang, is one of the oldest Chang Hon patterns. Similarly, it borrows mostly from the Pinan/Heian series, with one or two pieces of other patterns, and contains kicking techniques not seen in Karate kata.
The following videos were used as reference:
ITF Legacy performance of Choong Moo.
Hirokazu Kanazawa performing Heian Nidan, Heian Yondan, Heian Godan, Enpi, Nijushiho (Shotokan).
Movements 1 and 2 of Choong Moo appear in Heian Yondan, though they are not connected there. The knife hand twin forearm block opens Yondan, whereas the high knife hand strike comes halfway though. This could be coincidental, but I note it mostly because Choong Moo borrows a section from Yondan later into the pattern.
I did notice, however, that Choi's 1965 book lists the directions for movement 2 as a "(right front) stance," while the accompanying image incorrectly shows the left foot in front. The text describes Choong Moo as it is performed today, whereas the image resembles the position in Heian Yondan. Whether this supports their connection or was a coincidental error is up for debate.
Movement 5 turns to the North. This follows with a kick to the rear, landing in a back stance with a knife hand block. This is yet another piece of Heian Nidan once again slightly modified when reused in Won Hyo.
The preceding movements, the "knife hand, step, high spear," could be viewed as a modified version of Heian Nidan's "knife hand, step, middle spear" seen in Hwa Rang and Won Hyo. I consider this only because of their placement next to Nidan's kick, but is likely just coincidental.
Choong Moo then executes a flying side kick, something not seen in Karate kata. I've written more about unique kicking in early Chang Hon patterns here.
Following the next turn, Choong Moo uses the knee section from Heian Yondan, previously seen in Toi Gye. What is interesting is that Toi Gye follows the original sequence more closely, following with knife hand blocks, whereas it is typically the older patterns that follow the Karate kata more closely.
Choong Moo follows with a 180 degree turn into a ridge hand strike, which is found in Niseishi/Nijushiho, but I consider it incidental.
The following spinning kick combination is unseen in Karate kata. See kicking note above.
Choong Moo follows with a U shape block, a counter-clockwise 360 degree jump, then lands in a back stance with a knife hand block. This sequence comes from Wanshu/Enpi, blocks and all, which Choi lists in his 1965 book as "EN-BI."
Immediately following the Enpi jump, Choong Moo does the low spear hand into high backfist sequence from Heian Godan. As mentioned in Toi Gye, similar sequences are common in Karate kata, but this part of Choong Moo matches the stances and hand positions of Godan exactly.
I find no similarities following this.
