(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
PW[]PB[Black to Play]C[Just play through the moves to move 14 which is the problem
position. These do not represent a game sequence!]
;B[dq]
;W[cq]
;B[fq]
;W[bq]
;B[dp]
;W[cp]
;B[do]
;W[bo]
;B[co]
;W[]
;B[bn]
;W[]
;B[cm]
;W[]C[This is the problem position. Black to play and kill white.]
(;B[ap]
;W[dr]
;B[er]
;W[cs]
;B[br]
;W[ar]
;B[bs]
;W[ao]C[Failure: trying to poke the eye out on the side allows white time to make two eyes by playing in the corner.])
(;B[cr]
;W[br]
;B[ds]
;W[ap]C[Failure: two easy eyes.])
(;B[dr]
;W[ap]
;B[br]
;W[cr]
;B[cs]
;W[bs]
;B[as]
;W[ar]C[Failure: this ends in ko but black can do better.])
(;B[ds]C[CORRECT: the protecting stone on the 6-3 point is the clue in this shape.]
(;W[ap]
;B[bs]
;W[br]
;B[ar]C[White dies as there is no way to capture the black stones on the bottom]
;W[dr]
;B[er]
;W[cr]
;B[cs]
;W[aq]
;B[es]
;W[as]C[The corner eye is false.])
(;W[cr]
;B[ar]
;W[ap]
;B[an]C[This is harder to see.]
(;W[ao]
;B[aq]
;W[bp]C[Whatever white does he loses the eye.])
(;W[aq]
;B[ao]C[This way it is false.]))
(;W[bs]
;B[ar]
;W[ao]
;B[aq]C[Again white cannot make two eyes as he doesn't have enough liberties.]
(;W[ap]
;B[an])
(;W[br]
(;B[an]
;W[bp]C[White's shape is dead.])
(;B[ap]
;W[bp]C[Still dead.])))))
