(;
AB[db][dc][hb][hc][cc][fc][gc][ed][ee]
AW[eb][fb][gb][bc][bd][ec][cd][dd]
C[Black plays.]
(;
B[da]
C[Correct move to win the semeai.]
(;
W[cb];B[bb];W[ba]
C[White wants a ko, but ...]
(;
B[ea]
C[... Black captures the 4 stones to the right.]
)
    (;
    B[ca]
    C[Mistake.];
    W[ab]
    C[White has a ko.]
    )
    (;
    B[ab]
    C[Even worse.];
    W[ea]
    C[Black collapses.]
    )
)
    (;
    W[ca];B[bb]
    C[After Black plays here, White will have liberty shortages trying to approach from either side.];
    W[ab];B[ga]
    )
)
    (;
    B[bb]
    C[Fails.];
    W[da];B[cb];W[ab]
    C[White captures easily.]
    )
    (;
    B[ca]
    C[Stylish, but fails.]
    (;
    W[bb];B[ea];W[cb];B[ga];W[da];B[db];W[dc];B[fa];W[ba]
    )
        (;
        W[ea]
        C[Mistake.];
        B[ga];W[ba];B[ha]
        C[Black wins the semai.]
        )
    )
)

