Dieter: After a search on Gobase, I realize one can't speak of joseki here. The variations are just too much.
Charles Matthews Brave guy! I think there are some unexplored joseki out there. I have heard tell of a Yasunaga Hajime variation that may be poorly documented.
[1] In this peaceful variation, the corner temperature rapidly cools down.
Bill: And
is more efficiently placed than on takamoku (b). This is better for White than the corresponding takamoku joseki.
Now a will soon become very big, both making and denying a base.
Bill: I doubt it. (That comment was made before I added
. But if Black wants to attack if White omits
, a is not the place to play.)
[2] a, b, c or d are considered joseki. The move at e is interesting but bad for Black, usually.
First atari
Second atari
First extension
Second extension
11 @ a
Third extension
To ,
is the best reply (IMO, please confirm). The corner is big.
This is unplayable. White will get enormous thickness and influence in all directions :
If here, B gets the corner and sente. It looks as if White is tricked.
Dieter: What is not clear to me, is whether a is now too important for Black to play tenuki. This result somehow reminds of a result of the large avalanche but for Black having sente I think.
This way looks fairly equal. Should Black use his sente to play a ?
[3] DaveSigaty: You mentioned a second tenuki by Black at the top but did not show any variations. It is actually Black's most frequent choice (per GoGoD, I didn't confirm on Gobase), so it should also be considered joseki, no ? :).
White most often plays 3 to which Black answers with a, b, or a third tenuki.