(;
AB[pd][pf][pj][pp][jp][dc][cc][eb]
AW[dd][dj][dp][nc][jd][cd][ec]
TR[eb]
C[White's response to the marked play?

Source:
    "How to Improve at Fuseki"
    Kato Masao 9P
    Go World, Vol. 12, pp. 39-40]
(;
W[fc]
C[With White's stones below, the ordinary extension here might seem best, but ...];
B[fb];W[gc];B[bd];W[be];B[bc];W[cf]
TR[nc][pf]
LB[qf:A]
C[... although White does have a nice moyo on the left side, White's earlier marked exchange becomes bad.  The reason is that White's top area is open for Black's upper left group.

If White had played the upper left joseki before the marked exchange, then making an approach move at A would have been more appealing for White.]
)
    (;
    W[fb]
    C[To avoid the problem with the previous variation, White switches to this double hane.]
    (;
    B[fc]
    C[The game sequence.];
    W[ed];B[gb]
    C[Black captures a stone, but ...];
    W[fd];B[fa];W[gc];B[fb];W[qn]
    C[... White has sente to make the big approach move here.];
    B[qo];W[pn];B[np];W[pl]
    C[The lower right is a set pattern.];
    B[hc];W[gd];B[hd]
    LB[qk:A]
    C[Black keeps the attack at A in reserve.]
    )
        (;
        B[bd]
        C[After the game, Takemiya said that the following sequence is better for Black.];
        W[be];B[ce];W[ed]
        C[White must connect here.];
        B[bf];W[bc];B[ae];W[bb];B[ch]
        C[Black establishes a base on the left side, which was more important to White than the top.]
        )
    )
)

