Tim I have a question. I couldn't find any convincing sequence for the reply at to white hane at . Anyone ?
Dieter: but should the corner stone be there? Anyway, ...
After , Black wants to cut at a. But then White plays b and the position crumbles. There is something strange going on here, as White got an extra move, so there is no standard pattern involved.
tapir: I would say this question is more a misunderstanding than anything. If anything needs comment than that a tenuki after the 3-3 invasion is unwarranted, while moves at a, b, c might have some merit here.