The keima cover
White has approached at ; and Black responds
with the cover
.
How should White continue?
This depends on the situation on the whole board[1]. When White played she already knew, perhaps, what she was going to do. There are a number of complex variations that can follow.
Taking the point will look good in any strategy for Black based on influence. A white stone there makes a major difference (see 3-4 point high approach, keima).
Possible plans for White.
There is an important ladder to consider after Black b, affecting joseki choice by both sides. This ladder should be checked before is played as an approach (or White plays tenuki, if
was the initial corner play here).
Dieter I think that this will make the opponent jumpy to the end of the game. It turns out that Black cannot eliminate the aji with a single extra move. White will plan to reduce the effect of Black's possible influence/thickness before surviving in the corner.
Finally
See also Get Strong at Joseki problem discussion.
[1]
Not always! This is the position after 19 moves in Tsukakoshi Tsuneyasu(White) - Takagawa Kaku, Spring Oteai, 1935-05-19. White responded to Black's initial 5-4 with an immediate play at 3-4 and the rest followed. :-) --DaveSigaty
So? I do think that both players took the emptiness of the rest of the board in account when choosing their josekis - Andre Engels