(;
AB[eb][fc][fd][gd][ed][dd][ce][be][ch]
AW[bc][bd][cd][dc][ec][fb][gb][gc][hc]
C[Black plays.

Source:
    A problem from the endgame volume of Gokyo Seimyo, a nearly 200 year old problem set.]
(;
B[db]
C[The 1st move is easy.];
W[cc]
(;
B[ab]
C[The placement tesuji!]
(;
W[cb];B[ad]
C[And with this follow up, Black connects to the corner stone.];
W[ac]
C[For example, White cannot cut off the corner stone.];
B[ca]
C[White collapses.]
)
    (;
    W[ac]
    C[White doesn't have enough liberties to block here.];
    B[bb]
    C[White collapses.]
    )
)
    (;
    B[ad]
    C[Bad timing.];
    W[ab]
    C[White takes the vital point to save the corner.];
    B[cb]
    C[For example ...];
    W[bb];B[ae];W[ea]
    C[White wins the semeai.]
    )
)
    (;
    B[ad]
    C[Bad timing.];
    W[db]
    C[Good enough to protect the corner.];
    B[ac]
    C[For example ...];
    W[ab];B[ae];W[bb]
    C[White saves the corner.]
    )
)

