(;
AB[aa][ba][ca][ha][ib][jb][cc][dc][ec][fc][gc][hc][jd][ae][be][ce][de]
AW[cb][db][eb][fb][gb][hb][ac][ad][bc][bd]
C[Black plays.]
(;
B[bb]
C[A common tesuji in corner tsumego, but bad timing here.];
W[da]
C[Now White can atari 1st here to create a corner eye in sente.]
(;
B[ga];W[ab];B[ba];W[fa];B[bb];W[ia]
C[White is already clearly alive, but ...];
B[cd]
C[... Black cannot even take the corner.];
W[ca];B[aa];W[bc];B[ac];W[ab]
)
    (;
    B[fa]
    C[Too late.];
    W[ab];B[ba];W[ga];B[bb];W[ia];B[cd];W[ca];B[aa];W[bc]
    )
)
    (;
    B[ga]
    C[Fails.];
    W[fa];B[bb];W[ia]
    (;
    B[cd]
    C[An amazing sequence follows, but ...];
    W[da];B[ab];W[bc];B[ac];W[ad];B[bb];W[ab];B[ba];W[ca];B[bd];W[aa];B[bb];W[ba];B[ac]
    C[... although Black forces a ko for an eye in the corner, ...];
    W[ha]
    C[... White simply makes a 2nd eye at the top.]
    )
        (;
        B[da];W[ea];B[cd];W[ab]
        C[Black has nothing.]
        )
    )
    (;
    B[fa]
    C[Fantastic move!]
    (;
    W[ga];B[bb];W[ia];B[cd]
    C[Black's 1st move allows this crucial atari to work.];
    W[da];B[ab];W[bc];B[ac];W[ad];B[bb];W[ab];B[ba];W[ca];B[bd];W[aa];B[bb];W[ba];B[ac]
    C[Ko!!  The best result for both sides.]
    )
        (;
        W[bb]
        C[Trying to eliminate the corner aji doesn't work either.];
        B[ga];W[ea];B[ia]
        C[Bent 4 in the corner.  White dies.]
        )
    )
)

