(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PB[Black to play]AW[bp][bq][dq][dr][cs]AB[ao][bo][co][eo][dp][eq][er][es]C[This is the problem position. Black to play.]
(;B[cp]C[Strangely simply playing the key outside point is correct and kills the group.]
(;W[cq]C[If white blocks, then black can switch inside....]
;B[br]
;W[ar]
;B[bs]
;W[ap]
;B[ds]C[And white runs out of liberties.])
(;W[br]C[This movbe also fails to live]
;B[cq]
;W[ap]
;B[cr])
(;W[ap]C[And this fails]
;B[cq]
;W[br]
;B[cr])
(;W[ar]C[And this]
;B[cq]
;W[cr]
;B[ap])
(;W[bs]
;B[cq]
;W[cr]
;B[ar]C[And this.]))
(;B[br]C[Black playing inside first does not work.]
;W[ar]
;B[bs]
;W[cr]C[Now there are miai points to make the second eye.]
(;B[cp]
;W[ap]
;B[cq]
;W[as]C[White lives])
(;B[ap]
;W[cp]
;B[aq]
;W[as]C[White lives.]))
(;B[ap]C[White can easily live if black plays this one.]
;W[br]
;B[aq]
;W[ar]
;B[cp]
;W[cq]))
