(;
AB[pp][pd][nd][qn]
AW[qf][ql][nq][rp]
TR[rp]
C[Black's response to the marked play?

Source:
    Go World #17, p. 57
    "The Submarine Attack"]
(;
B[qo]
C[This kind of response is what White is hoping for.];
W[pr]
C[White is happy to make outside forcing moves.];
B[qq];W[qr];B[rq];W[rr];B[sq]
LB[lp:A][rm:B]
C[White strengthens the lower stones, and Black is already over-concentrated.

Now White can make a good position with A.  Later, White can attack with B, which takes away Black's base.]
)
    (;
    B[qq]
    C[Another bad response.];
    W[qo]
    C[White easily escapes.];
    B[po];W[rn]
    C[White connects out and Black's group has no base.]
    )
    (;
    B[ro]
    C[Attaching here is even worse.];
    W[qp];B[po];W[pr]
    C[White has this classic tesuji to connect the lower right stones.  White looks to have a severe attack against Black.];
    B[qq]
    C[This hane doesn't work.];
    W[rq]
    C[White simply descends here.  The reader can verify that Black cannot cut White's stones.]
    )
    (;
    B[qp]
    C[Correct.];
    W[ro]
    (;
    B[qm]
    C[Another good move.  The following variations show that Black obtains a good result.]
    (;
    W[qq];B[pq];W[qr];B[pl]
    (;
    W[pr];B[qk]
    C[Black makes good shape.]
    )
        (;
        W[qk];B[pr]
        C[Black builds good thickness.]
        )
    )
        (;
        W[pl];B[rq]
        C[Black captures the 2 stones.]
        )
    )
        (;
        B[rn]
        C[Blocking here is slack.];
        W[qq];B[pq];W[qr]
        (;
        B[pm]
        C[Black shape is not as good as in the previous variation.]
        )
            (;
            B[pr]
            C[Risky, especially for someone taking a big handicap.];
            W[qo];B[po];W[pn]
            C[White is happy to create complications.]
            )
        )
    )
)

