(;AB[bp]AB[cp]AB[dp]AB[ep]AB[eq]AB[dr]AB[ds]AB[es]AB[fs]AB[gs]AW[co]AW[bo]AW[do]AW[eo]AW[fp]AW[fq]AW[fr]AW[er]AW[gr]AW[hs]AW[hq]AW[fo]AB[ao]AW[cq]AW[cs]AW[bl]AP[goproblems]
(;B[cr];W[br]
(;B[dq];W[bq]
(;B[ap];W[an];B[bs];W[ar]C[Seki])
(;B[bs];W[ar]
(;B[aq];W[ap]C[ko])
(;B[ap];W[an]C[Seki])))
(;B[bs];W[bq]
(;B[ar];W[aq];B[ap];W[as])
(;B[dq];W[ar]
(;B[aq];W[ap]C[ko])
(;B[ap];W[an]C[Seki]))))
(;B[bq];W[br]
(;B[dq];W[ap]
(;B[ar]C[RIGHT])
(;B[aq];W[cr];B[ar];W[bs]C[Black are dead.])
(;B[as];W[cr];B[aq];W[bs]C[Black are dead.])
(;B[bs];W[as];B[cr]C[RIGHT])
(;B[cr]C[RIGHT]))
(;B[ar];W[as]C[You must live without ko at B1.]
(;B[bs]C[NOTTHIS])
(;B[dq];W[aq]C[]
(;B[cr];W[an]C[ko])
(;B[ap];W[an]C[ko]))
(;B[ap];W[cr];B[dq];W[aq]C[ko])
(;B[aq];W[cr]
(;B[bs];W[dq]C[Black are dead.])
(;B[dq];W[ap]C[Black are dead.])))
(;B[bs];W[cr];B[dq];W[ar]C[Black are dead.]))
(;B[br];W[cr];B[dq];W[bq];B[ap];W[an]C[Black are dead.])
(;B[dq];W[bq]
(;B[cr];W[br]
(;B[ap];W[an];B[bs];W[ar]C[Seki])
(;B[bs];W[ar]
(;B[aq];W[ap]C[ko])
(;B[ap];W[an]C[Seki])))
(;B[br];W[cr];B[ap];W[an]C[Black are dead.])
(;B[ap];W[cr]C[Black are dead.])))