3-4 point distant high approach, tenuki, inside contact
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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.)
To , is the best reply (IMO, please confirm). The corner is big.
If here, B gets the corner and sente. It looks as if White is tricked.
This way looks fairly equal. Should Black use his sente to play a ?
I disagree with 10. It isn't needed to defend the cut, since a geta will do.
 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 ? :).