(;
AB[cm][bn][dn][co][eo][dp][dq][gp][hp][ip][jp][eq][fq][jq][fr][hr][ir]
AW[bo][cp][cq][ep][gq][hq][iq][dr][er][gr][fs]
C[Black plays.];
B[br]
C[Assume Black starts with this plausible looking placement.  Can Black kill the corner?];
W[cr]
(;
B[bp]
C[Doesn't work.];
W[bq];B[ao];W[bs]
C[White has eyes.]
)
    (;
    B[bq]
    C[Seems plausible, but ...];
    W[bp]
    C[... now what?];
    B[bs];W[ar]
    C[White's placement maintains the eye shape.];
    B[es];W[ds];B[ao];W[ap]
    C[White lives in seki.]
    (;
    B[an]
    C[For example ...];
    W[aq]
    )
        (;
        B[aq]
        C[Overplay.];
        W[an];B[am];W[cs]
        C[White lives with territory.]
        )
    )
    (;
    B[ao]
    C[A standard tsumego tesuji that seems to be the only move that works.]
    (;
    W[bp];B[bs];W[es];B[cs]
    (;
    W[ap];B[ar]
    C["One eye vs. no eye".  White dies.]
    )
        (;
        W[ar];B[ap]
        C[White dies.]
        )
    )
        (;
        W[bs];B[ar]
        C[Black connects up the left edge.  White dies.]
        )
        (;
        W[bq];B[aq]
        C[Black's stone connects out.]
        )
    )
)

