(;AB[cp]AB[dp]AB[ep]AB[fp]AB[fq]AB[fr]AW[aq]AW[bq]AW[cq]AW[dq]AW[eq]AW[er]AB[fs]C[Black to kill.]AB[bp]AB[ap]AP[goproblems]
(;B[es];W[ds]
(;B[bs]
(;W[cr];B[cs]C[RIGHT])
(;W[br];B[cs];W[dr];B[as]C[RIGHT]))
(;B[cs];W[bs];B[dr];W[cr];B[ds];W[ar]))
(;B[cr];W[br];B[ds];W[es];B[bs];W[dr])
(;B[dr];W[ds];B[cr];W[br]
(;B[es];W[cs])
(;B[cs];W[bs]))
(;B[br];W[cr]
(;B[es];W[ds])
(;B[ds];W[es];B[cs];W[ar];B[bs]C[This is a seki.]))
(;B[cs];W[cr]
(;B[bs];W[es];B[ds];W[ar])
(;B[ds];W[bs])
(;B[es];W[bs]))
(;B[bs];W[es]
(;B[ar];W[cr])
(;B[cr];W[br]
(;B[ds];W[dr])
(;B[cs];W[ds]
(;B[ap];W[ar])
(;B[ar];W[as]))))
(;B[ds];W[es]
(;B[cs];W[br];B[bs]C[This is a seki.];W[cr]
(;B[ap];W[ar])
(;B[ar];W[as]))
(;B[bs];W[cr];B[cs]C[This is a seki.];W[ar]))
(;B[ar];W[br]))