An easy problem, at least if you are not a german 3d.
(;AB[br]AB[cq]AB[dq]AB[eq]AB[er]AB[fs]AB[ar]AW[bq]AW[aq]AW[bo]AW[cp]AW[dp]AW[ep]AW[fp]AW[fq]AW[fr]AW[gr]AW[hr]C[Black to live WITH TERRITORY, seki is not good enough.]AW[bs]AP[goproblems]
(;B[cr]C[];W[ds];B[es];W[cs]C[only Seki, black can do better.])
(;B[cs];W[ds]
(;B[as]C[Right :) In a real game two pro's missed the solution and the seki was played.'RIGHT])
(;B[cr];W[es]C[2nd eye is false :(])
(;B[dr];W[cr]C[Only ko :(])
(;B[es];W[cr]C[oops]))
(;B[ds];W[cr]C[:(])
(;B[es];W[cr]C[:(])
(;B[dr];W[cs]C[:(])
(;B[as];W[cr]C[oops]))