(;
AB[cq][dq][eq][er][fr]
AW[bn][cn][co][eo][cp][hp][fq][gq][dr][hr]
C[White plays.

Source:
   Qi Jing Zhong Miao #432, an ancient collection of mostly kyu level life and death problems.

Analysis:
    Myron Souris]
(;
W[ar]
C[The only move that works.  What an odd looking tesuji!]
(;
B[br]
C[Black can try the obvious defense here.];
W[aq]
C[But White can simply pull out his corner stone.];
B[ds];W[fs];B[cr];W[bs]
C[Black cannot make a 2nd eye.]
)
    (;
    B[bp]
    C[A Black hane defense here also seems to show promise, but ...];
    W[ap]
    C[But White can still pull out his corner stones here.];
    B[ao];W[aq]
    C[White's stones escape, so Black's corner dies.]
    )
)
    (;
    W[aq]
    C[Fails];
    B[ar]
    C[Now Black takes the vital point.];
    W[br];B[bq];W[ap];B[bs]
    C[Black has a ko.]
    )
    (;
    W[br]
    C[Fails];
    B[bq]
    C[Black can simply block here to make an easy life.]
    )
)

