(;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 34 which is the problem
position. These do not represent a game sequence!]
;B[cr]
;W[cs]
;B[bq]
;W[br]
;B[cp]
;W[ar]
;B[dp]
;W[aq]
;B[eq]
;W[ap]
;B[ds]
;W[bo]
;B[es]
;W[co]
;B[fq]
;W[do]
;B[gq]
;W[ep]
;B[gr]
;W[fp]
;B[gs]
;W[gp]
;B[]
;W[hq]
;B[]
;W[hr]
;B[]
;W[hs]
;B[]
;W[ho]
;B[]
;W[fr]
;B[]
;W[er]C[This is the problem position. Black to play and live.]
(;B[dr]
;W[cq]
;B[dq]
;W[bp]C[Failure: the white throw in makes the second eye false.])
(;B[fs]
;W[cq]
;B[dq]
;W[bp]C[Failure: again the eye is false.])
(;B[dq]
;W[bp]C[Failure: the second eye is false and there can be only 1 eye from capturing the two stones. It is not seki as white can add a third stone inside the eye.])
(;B[bp]
;W[dq]
;B[cq]C[Failure: Expanding the eye space looks right but black is short of liberties when white ataris.])
(;B[cq]C[CORRECT: this move expands the eyespace a little bit.]
(;W[dr]
;B[bs]C[White has to make a seki.])
(;W[bs]
;B[dr]C[Any other move by white lets black live with territory.])))
