(;AB[ap]AB[bp]AB[co]AB[bn]AB[do]AB[eo]AB[go]AB[fp]AB[fq]AB[fr]AB[fs]AW[bq]AW[bs]AW[cp]AW[dp]AW[ep]AW[eq]AW[er]C[Black to kill]AP[goproblems]
(;B[dr]
(;W[ds]C[CHOICE]
(;B[br]
(;W[ar]C[CHOICE];B[cr]
(;W[cq]C[CHOICE]
(;B[es]C[RIGHT])
(;B[aq];W[cs]C[ko]))
(;W[cs];B[es]C[RIGHT])
(;W[aq];B[es];W[cq];B[cs]C[RIGHT]))
(;W[cr];B[ar]C[RIGHT]))
(;B[es];W[cr]
(;B[cs]C[ko])
(;B[ar];W[aq];B[cs]C[ko]))
(;B[cr];W[br]
(;B[es];W[cs])
(;B[aq];W[ar])
(;B[cs];W[es]))
(;B[ar];W[br]
(;B[aq];W[cr])
(;B[es];W[cr];B[cs]C[ko])
(;B[cr];W[aq]
(;B[cs];W[es])
(;B[es];W[cs])))
(;B[aq];W[ar];B[cq];W[cr];B[br]C[ko]))
(;W[cr];B[ar]
(;W[aq]C[];B[ds]C[RIGHT])
(;W[ds];B[br]C[RIGHT]))
(;W[ar];B[cr]
(;W[ds];B[es]C[RIGHT])
(;W[es]C[];B[cq]C[RIGHT])))
(;B[ar];W[br]
(;B[aq];W[dr])
(;B[es];W[ds]
(;B[dr])
(;B[cr];W[aq]))
(;B[dr];W[ds]))
(;B[cr];W[br]
(;B[es];W[ds])
(;B[cs];W[cq])
(;B[cq];W[cs]
(;B[aq];W[dr]
(;B[es];W[ar])
(;B[ar];W[es]))
(;B[ds];W[dr];B[es];W[dq])
(;B[es];W[ds]))
(;B[dr];W[ds])
(;B[ds];W[cq]))
(;B[br];W[ar];B[cr];W[cq]
(;B[dr];W[es]
(;B[ds];W[aq])
(;B[aq];W[ds];B[as]C[ko]))
(;B[cs];W[dr]C[ko])
(;B[ds];W[dr]))
(;B[aq];W[ar]
(;B[cq];W[cr]C[ko])
(;B[cr];W[cq]
(;B[br];W[dr]C[ko])
(;B[dr];W[ds]
(;B[es];W[cs])
(;B[br]))
(;B[cs];W[br]))
(;B[dr];W[cr]))
(;B[es];W[dr]
(;B[ar];W[br];B[aq];W[ds])
(;B[cr];W[cq])
(;B[br]))
(;B[ds];W[dr]
(;B[ar];W[br])
(;B[es];W[cr])
(;B[cr];W[br]))
(;B[cq];W[cr];B[aq];W[dq];B[ar];W[br]))
kaf