(;AB[bp]AB[cp]AB[dp]AB[dq]AB[eq]AB[fq]AB[gr]AB[gp]AB[gn]AB[em]AB[bl]AB[cl]AB[dl]AB[gl]AW[ap]AW[bq]AW[cq]AW[co]AW[bo]AW[do]AW[eo]AW[an]AW[bm]AW[cm]C[Black to kill, wihout ko]AP[goproblems]
(;B[bs];W[dr];B[ds]
(;W[er]
(;B[es];W[fs]
(;B[cs];W[fr]
(;B[cr];W[br];B[gs]C[RIGHT])
(;B[ar]C[RIGHT])
(;B[aq]C[RIGHT]))
(;B[cr];W[cs]
(;B[br];W[aq]
(;B[ds]C[RIGHT])
(;B[fr]C[RIGHT]))
(;B[ds];W[br]C[Ko])))
(;B[cr];W[br]C[Ko])))
(;B[cr];W[br];B[bs];W[dr]C[Ko])
(;B[br];W[cr])
(;B[cs];W[dr]
(;B[cr];W[br])
(;B[ds];W[es]))
(;B[dr];W[bs])
(;B[ds];W[bs]))
