Just when I thought all about Chen taiji have been written (at least the chinese books), I saw a few new books on the shelves when I visited the bookstores recently.  I usually try to buy them as they are relatively affordable compared to English books and their printing quality has improved a lot over the past few years.
One of the new book is by Ma Hong, titled 陈式太极拳劲道释秘-拆拳讲劲 . Roughly translated as Chen Style Taijiquan Secrets Explained – Dissecting the Routine to Explain the Jing.
I have not read it but …

If you wonder why are you doing so many wrist rotations in silk reeling exercise and form routines, one of the reasons is to train for qinna applications. Qinna means “to Capture , to take control”. Let see a quick demonstration by GM Zhu TianCai on some qinna applications.
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It was said that most of the qinna techniques now taught by the Chen Village folks were taught by the 18th …