(;
AB[qd][nc][bp][bo][co][dp][dq][eq][er][fr][gq][hq][iq][jq][bn][bm][al][cl][dl][ek][ei][gi][gg][ig][ce][cc][bb]
AW[pp][ip][ho][fo][ep][fq][do][en][dn][cm][cp][cq][cr][dr][bl][bk][bj][ck][dh][df][ed][dc][cb][hd][gl][hk][ii]
TR[bb]
C[White's response to Black's marked play?

Source:
    Go World, #38, Winter 1984-85, pp. 16-17
    29th Honinbo, Awaji Shuzo vs. Rin Kaiho]
(;
W[cd]
C[A natural looking move, but wrong!];
B[bc]
(;
W[bd];B[db];W[eb];B[ca];W[de]
C[Black makes life in sente.
A horrible result for White.]
)
    (;
    W[db]
    C[If White tries to avoid the result from the previous line by connecting here ...];
    B[bd]
    C[Black can easily make life with the following sequence.];
    W[bf];B[cf];W[cg];B[be];W[bg];B[de];W[ee];B[dd]
    C[White ends in sente, but Black has multiple defects in White's wall to exploit.
Another success for Black.]
    )
)
    (;
    W[bc]
    C[The game line.];
    B[cd]
    (;
    W[ba];B[ab];W[eb]
    C[Black can live and even take profit on the left side, but with sente, White can choose how to direct the flow of the game.]
    )
        (;
        W[ab]
        C[White can think about this move, but the possibilities are numerous and complicated enough that neither pro wanted to risk this line!  One possibility follows that may not be optimal.];
        B[ba];W[ca];B[db];W[aa];B[eb];W[fc];B[bd];W[fb];B[bb];W[ba];B[ac];W[ad];B[ae];W[ec]
        C[And White has ko threats to fight the ko.]
        )
    )
)

