(;AB[bp]AB[bo]AB[bn]AB[co]AB[eo]AB[fo]AB[go]AB[gp]AB[hq]AB[iq]AB[io]AB[gr]AB[cr]AB[dr]AB[ds]AW[ap]AW[bq]AW[br]AW[bs]AW[cs]AW[cq]AW[cp]AW[ep]AW[fp]AW[fq]AW[gq]C[Black to kill]AP[goproblems]
(;B[dq];W[dp]
(;B[fs]
(;W[hr]C[CHOICE]
(;B[es]C[RIGHT])
(;B[fr];W[er])
(;B[hs];W[fr]
(;B[ir];W[es])
(;B[es];W[gs]C[ko]))
(;B[ir];W[fr]
(;B[hs])
(;B[es];W[gs]))
(;B[er];W[fr])
(;B[gs];W[es];B[er];W[fr]
(;B[es];W[hs])
(;B[ir];W[eq])))
(;W[es];B[fr];W[hr];B[ir];W[eq];B[er]C[RIGHT])
(;W[fr];B[es];W[hr]
(;B[gs];W[eq];B[ir]C[RIGHT])
(;B[hs]C[]))
(;W[er];B[es]C[RIGHT]))
(;B[fr];W[er]
(;B[es];W[fs])
(;B[fs];W[eq]))
(;B[gs];W[er])
(;B[es];W[fs];B[fr];W[er]
(;B[gs];W[eq])
(;B[eq];W[er])))
(;B[fs];W[dq]
(;B[fr];W[er]C[]
(;B[es];W[hr]C[ko is not a solution])
(;B[hr];W[es]))
(;B[es];W[fr]
(;B[hr];W[er])
(;B[gs];W[er])
(;B[hs];W[er])
(;B[er];W[eq]))
(;B[er];W[fr]))
(;B[fr];W[er]
(;B[dp];W[dq];B[eq];W[es])
(;B[dq];W[dp])
(;B[fs];W[dq]C[ko])
(;B[es];W[dq]C[ko is not a solution]))
(;B[hs];W[er])
(;B[er];W[fr]
(;B[fs];W[eq]
(;B[aq];W[ar])
(;B[hr];W[dq])
(;B[gs];W[dq])
(;B[es];W[dq]))
(;B[dp];W[dq]
(;B[fs];W[eq])
(;B[do];W[eq])))
(;B[dp];W[dq]
(;B[fr];W[er])
(;B[er];W[fr]
(;B[fs])
(;B[do]))
(;B[fs];W[fr]
(;B[er])
(;B[es];W[hr])
(;B[hr];W[er]))
(;B[do];W[er]))
(;B[es];W[dq]
(;B[fr];W[er])
(;B[fs])))