(;
AW[bl][cm][dn][en][fn][fo][fp][bq][cq][dq][eq]
AB[co][eo][cp][ep][fq][gq][br][cr][dr][er]
C[White plays.

Source:
    Qi Jing Zhong Miao #315, an ancient collection of mostly kyu level life and death problems.

Side variation analysis:
    Myron Souris]
(;
W[bp]
C[A vulgar move.];
B[bo]
C[Black simply blocks.  The White stones die.]
)
    (;
    W[ao]
    C[Looks promising, but also fails.];
    B[bn]
    (;
    W[an];B[ap]
    C[Black can catch White in a shortage of liberties.];
    W[bp];B[am]
    C[Black captures all the White stones.]
    (;
    W[do];B[dp];W[aq];B[bo];W[bm];B[ap];W[ao];B[ar]
    )
        (;
        W[aq];B[bo];W[bm];B[ap];W[ao];B[ar]
        )
    )
        (;
        W[bp];B[bo]
        )
    )
    (;
    W[bo]
    C[Slack.];
    B[bp];W[ap];B[bn];W[do];B[ao];W[dp];B[aq]
    C[White saves his stones, but Black escapes with all but 2 stones.  White can do better.]
    )
    (;
    W[an]
    C[The right idea, but the timing is bad.];
    B[ao];W[bo];B[bp];W[ap];B[bn]
    C[White has to fight a ko to capture the Black stones.]
    )
    (;
    W[ap]
    C[The correct move order.]
    (;
    B[bn]
    (;
    W[do]
    C[Now White can first reduce Black's liberties.];
    B[dp];W[bo]
    C[And this time, Black is the one in a shortage of liberties.];
    B[cn];W[bm]
    )
        (;
        W[an]
        C[Fails];
        B[ao];W[bo];B[bp]
        C[Ko]
        )
        (;
        W[bp]
        C[Fails];
        B[bo];W[dp];B[do]
        )
    )
        (;
        B[bp];W[ao];B[an];W[bn]
        )
    )
)

