(;
;AW[bn][bp][cp][dp][ep][fp][aq][gq][hq][br][hr][bs][ds][hs]
AB[bq][cq][dq][eq][fq][ar][gr][es][gs][er]
C[White to kill.]
(;W[cr];B[ap])
(;W[cs];B[ap])
(;W[dr];B[ap])
(;W[as];B[cr];W[cs];B[dr])
(;W[fr];B[ap]
(;W[ao];B[cr];W[cs]C[This fails; if Ba3 it's seki, if Bd2 it leads to ko. You can do better])
(;W[fs];B[cr];W[cs]C[Wrong, this is seki.])
(;W[cr]C[Wrong. If Bf1 Wd2 it's seki, if Bd2 Wf1 it becomes ko. But you can do better.])
)
(;W[fs];B[ap]
(;W[ao];B[cr];W[cs]C[This fails; if Ba3 it's seki, if Bd2 it leads to ko. You can do better])
(;W[fr];B[cr];W[cs]C[Wrong, this is seki.])
(;W[cr]C[Wrong. If Bf2 Wd2 it's seki, if Bd2 Wf2 it becomes ko. But you can do better.])
)
(;W[ap];B[cr];W[cs];B[dr]
(;W[fr];B[as];W[cs];B[ds];W[bs];B[br];W[fs]C[RIGHT])
(;W[fs];B[as];W[cs];B[ds];W[bs];B[br];W[fr]C[RIGHT])
)
)