(;AB[ao]AB[bo]AB[co]AB[dp]AW[ap]AW[bp]AW[cp]AW[dq]AW[dr]AW[cr]AW[eq]AW[fq]AW[gq]AB[er]AB[fr]AB[gr]AB[hq]AB[gp]AB[fp]AB[ep]AB[ds]C[black to kill]AP[goproblems]
(;B[bs];W[br]
(;B[cs];W[es];B[fs];W[ar]
(;B[bq];W[as])
(;B[hr];W[bq]))
(;B[ar];W[cs]
(;B[bq];W[as]C[ko])
(;B[aq];W[as]C[ko]))
(;B[bq];W[es]
(;B[aq];W[cq]
(;B[ar];W[as];B[ar];W[aq]C[ko])
(;B[fs];W[ar];B[cs];W[as]))
(;B[ar];W[cq]
(;B[aq];W[as];B[ar];W[aq]C[ko])
(;B[fs];W[aq]))))
(;B[cs];W[br]
(;B[ar];W[aq]
(;B[bs];W[es]C[ko])
(;B[es];W[bs]))
(;B[bs];W[es];B[fs];W[ar]
(;B[bq];W[as])
(;B[hr];W[bq]))
(;B[bq];W[ar];B[bs];W[es]))
(;B[bq];W[ar]
(;B[br];W[bs])
(;B[cq];W[aq]
(;B[bs];W[br];B[cs];W[es])
(;B[cs];W[br];B[bs];W[es]))
(;B[aq];W[cq];B[bs];W[br])
(;B[bs];W[br]
(;B[cs];W[es])
(;B[aq];W[cq];B[cs];W[es];B[fs];W[as])
(;B[cq];W[aq];B[cs];W[es])))
(;B[br];W[bs]
(;B[bq];W[ar])
(;B[ar];W[bq]C[seki])
(;B[aq];W[ar]C[ko]))
(;B[ar];W[br]
(;B[bs];W[cs]
(;B[bq];W[as]C[ko])
(;B[aq];W[as]C[ko]))
(;B[cs];W[aq]
(;B[bs];W[es]C[ko])
(;B[es];W[bs]))
(;B[aq];W[bq])
(;B[bq];W[cq]
(;B[cs]
(;W[aq]C[CHOICE];B[bs];W[as];B[es]C[RIGHT])
(;W[es];B[aq];W[as];B[aq]C[RIGHT])
(;W[bs];B[aq];W[es];B[ds]C[RIGHT]))
(;B[bs];W[es]
(;B[aq])
(;B[fs];W[aq]))
(;B[aq];W[as]
(;B[aq];W[cs])
(;B[cs];W[aq]))
(;B[as];W[bs])
(;B[es];W[cs];B[bs];W[as]C[ko])))
(;B[aq];W[ar];B[bq];W[cq];B[bs];W[br]))