The forms that Grandmaster Hee Il Cho teaches are known as the "Chang Hon" pattern set or sometimes called the Chon ji patterns. They are the pattern set used exclusively by the ITF though the way that the ITF and GM Hee Il Cho teach and practice them vary. There are 24 patterns in this pattern set that were originaly developed by General Choi Hong Hi. It is well known that General Choi studied Shotokan for some time and learned the Pinan/Heian pattern set during that time. While there are definite differences between the Chang Hon Pattern set and the Pinan forms, you can definitely see parallels between the two sets, especially in the lower ranked forms such as Dan Gun, Do San and Won Hyo.
I only learned a few of the Pinan Patterns and that was over a decade ago and I was shocked at how close some of the patterns were to the Chang Hon set. I'm sure that some of the more advanced patterns in the Chang Hon set are most likely original creations though.
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