(;
AB[pd][dd][cc]
AW[cf][cd][dc]
TR[dc]
C[Black's response to the marked play?

Source:
    "Practical Tactics and Tesuji", Rin Kaiho 9P
    Go World, Vol. 13, p. 54]
(;
B[ec]
C[The proverb says, "Extend from a crosscut."  However, this atari is Black's safest course.];
W[db];B[ce];W[bd]
(;
B[ed]
C[Connecting on this side is correct.  White has little scope for variation.

No matter how White responds, Black's result is simple and good, and in many cases, the best.]
(;
W[bc]
C[White can capture the corner stone, but ...];
B[eb]
C[... Black can force here.];
W[cb];B[ic]
TR[ce]
C[And this extension is good.  In addition, Black's marked stone has aji.]
)
    (;
    W[cb];B[be]
    C[If White captures the corner stone from the other side, Black has this nice forcing move.];
    W[bc];B[df]
    C[Black has outside thickeness for White's corner territory.]
    )
)
    (;
    B[de]
    C[Connecting on this side leads to failure.];
    W[be];B[eb]
    C[Black can still force here, but ...];
    W[cb];B[df];W[cg]
    C[... now White makes too much territory for Black's outside thickeness.]
    )
)
    (;
    B[ed]
    C[Following the proverb to extend here is not a bad move.  However, White now has a chance to create complications.]
    (;
    W[bc]
    C[Black might be hoping that White plays this sequence.];
    B[cb];W[be];B[bb];W[ab];B[ec]
    C[Black has another simple good result.]
    )
        (;
        W[cb]
        C[But White can create complications with this atari.];
        B[bc]
        (;
        W[bd]
        C[This sequence is often played.];
        B[db];W[ec];B[bb];W[fc]
        C[To live, Black owes White another move in the corner.

If Black tenukis and White becomes stronger on the outside, White has the following sequence.];
        W[ca];B[ba];W[ac]
        C[Locally, Black cannot make 2 eyes.]
        )
            (;
            W[de]
            C[White can even play here.  The variations are highly involved.]
            )
        )
    )
)

