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Not much to explain here, this problem is just about recognizing this shape Xuanxuan Qijing Important Shape 1.
There isn't other first move really. White have 'a' to secure the eye by exhaustion.
interesting variation
shevious: The position of is subtle. It's not possible to break an eye at . It would work if there was black at a .
Referenced byXuanxuanQijingPro...