(;
AB[da][cb][cc][eb][ec][bc][hc][fd][gd]
AW[db][dc][dd][fc][ic][id][kc][lc][cd][ed][be][he][cf][ff]
C[White plays.

Source:
    From the yose volume of Gokyo Seimyo, a nearly 200 year old problem set.]
(;
W[hb]
C[White can reduce the top in sente, but ...];
B[gb];W[ib];B[fb]
C[... White can do better.]
)
    (;
    W[fb]
    C[White can try for more with this sequence, but ...];
    B[ea];W[fa];B[ca]
    C[... with a liberty shortage, White's 3 stones cannot escape.]
    (;
    W[hb];B[gb];W[ga];B[gc]
    )
        (;
        W[ia];B[ga];W[gb];B[hb];W[ha];B[ib]
        )
    )
    (;
    W[ia]
    C[A famous edge tesuji.  Now Black is in serious trouble.];
    B[hb]
    C[For example ...];
    W[ha];B[ib];W[jb];B[ga];W[fa];B[ea];W[gb];B[fb];W[ga];B[gc]
    C[Black capture the cutting stone, but ...];
    W[ja]
    LB[fc:A]
    C[... Black has a false eye at A, which is a common problem after other Black responses to White's initial edge tesuji.]
    )
)

