(;GM[1]FF[4]CA[UTF-8]AP[CGoban:3]ST[2]
RU[Japanese]SZ[19]KM[0.00]
AW[bq][cq][dq][er][fr][gr]AB[bp][cp][dp][eq][fq][gq][hq][dr][hr][hs]C[This is the problem position. Status?]
(;B[]
(;W[cr]C[If white plays first trapping the loose stone is enough to live.]
(;B[gs]
;W[ds]
;B[fs]
;W[bs]
(;B[ar]
;W[aq]
;B[es]
;W[dr])
(;B[es]
;W[dr]
;B[ar]
;W[aq]))
(;B[ds]
;W[cs]
;B[gs]
;W[es])
(;B[bs]
;W[ds]
;B[aq]
;W[ar]
;B[ap]
;W[br])
(;B[fs]
;W[ds]
;B[gs]
;W[es]
;B[bs]
;W[br]
(;B[aq]
;W[ar])
(;B[ar]
;W[aq]
;B[ap]
;W[as]C[A ko black can never win.])))
(;W[ds]C[This is not as good as the corner gets reduced]
;B[br]
;W[cr]
;B[aq]
;W[bs]
;B[ar]
;W[gs])
(;W[aq]C[Anything else is dangerous]
;B[cr]
;W[br]
;B[es]
;W[cs]
;B[fs]
;W[ds]
;B[gs]
;W[dr]C[Quite a big reduction for instance]))
(;B[ds]C[If black plays first can he do this?]
;W[cr]
;B[aq]
;W[ar]
;B[cs]
;W[ap]
;B[bs]
;W[bo]C[Looks like white can escape with some of the stones.])
(;B[cr]C[This looks like a good first move. 

It is the correct move.]
;W[br]
;B[gs]C[This move catches white short of liberties]
(;W[ds]
;B[es]
;W[cs]
;B[dr]
;W[cr]
;B[fs])
(;W[cs]
(;B[fs]
;W[ds])
(;B[es]
;W[ds]
;B[dr]
;W[cr]
;B[fs])))
(;B[gs]C[If black plays this move first.

This is also correct as white still dies, but it is harder to see.]
(;W[cr]C[White can play here.]
(;B[es]
(;W[ar]C[This is worng.]
;B[bs]
;W[ds]
;B[fs])
(;W[ds]
;B[fs]C[This move does not work.]
;W[bs]
;B[ar]
;W[aq]
;B[dr]
;W[er]C[white can live]))
(;B[bs]C[This is the correct move here - but is hard to see.]
(;W[ds]
;B[fs]
;W[es]
;B[cs]C[White now dead.])
(;W[cs]
;B[es]
;W[ds]
;B[fs]C[This dies too.])))
(;W[ds]
(;B[es]
;W[cr]
;B[fs]
;W[bs]
;B[ar]
;W[aq]C[white lives.])
(;B[cr]C[black has to extend.]
;W[br]
;B[es]
;W[cs]
;B[dr]
;W[cr]
;B[fs]))))
