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