(;AB[cr]AB[cq]AB[co]AB[dp]AB[eo]AB[fo]AB[go]AB[hp]AB[ip]AB[iq]AB[ir]AB[is]AW[dq]AW[dr]AW[fr]AW[fp]AW[gp]AW[hq]AW[hr]AW[hs]C[black to kill]AP[goproblems]
(;B[gr]
(;W[gq]
(;B[eq];W[er]C[CHOICE]
(;B[ep];W[gs])
(;B[gs];W[fs])
(;B[ds];W[ep]))
(;B[ep];W[eq])
(;B[ds];W[eq])
(;B[gs];W[eq])))
(;B[eq];W[er]
(;B[fq];W[gq];B[ep];W[gs])
(;B[gr];W[gs]
(;B[fq];W[gq])
(;B[ep];W[fq])
(;B[gq];W[fq]))
(;B[ds];W[ep])
(;B[gq];W[fq])
(;B[ep];W[fq])
(;B[fs];W[ep])
(;B[gs]
(;W[fq]C[CHOICE]
(;B[ep];W[gr])
(;B[gr];W[gq];B[ep]C[RIGHT]))
(;W[gr];B[fq]C[RIGHT])
(;W[ep];B[gq]C[RIGHT])
(;W[fs]C[CHOICE]
(;B[ds]
(;W[gr];B[fq]C[RIGHT])
(;W[ep];B[gq]C[RIGHT]))
(;B[fq];W[ds])
(;B[gr];W[gq]))))
(;B[gq];W[fq])
(;B[ds]
(;W[eq]C[CHOICE]
(;B[gq];W[gr];B[fs];W[es]C[ko])
(;B[es];W[fs])
(;B[fs];W[gs]
(;B[es];W[gq])
(;B[gq];W[es])))
(;W[er];B[ep];W[es];B[gs];W[gr];B[fq]C[RIGHT]))
(;B[es];W[ds]
(;B[eq];W[er])
(;B[gr];W[gq]))
(;B[ep];W[eq])
(;B[gs];W[eq]
(;B[gr];W[gq])
(;B[es];W[ds])))