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I have recently tried out the Ja Choong Soo excercises on a new member of our club.
I liked the excercises on this page very much. It would be nice to have even more Ja Choong Soo excercises. Perhaps involving the normal and vulgar way to cut through a knight's move.
I believe the negative aspect of cutting through the keima the vulgar way, is not so much loss of liberties (what ja chung su is all about) but straight vs. diagonal development of stones, resulting in bad shape, which is also very adequately described in K Min's article.