(;AB[dm]AB[am]AB[bm]AB[cn]AB[ao]AB[ap]AB[bp]AB[do]AB[dp]AB[dr]AB[eq]AB[fq]AB[gq]AB[hq]AB[hr]AB[jr]AB[gs]AW[bn]AW[bo]AW[co]AW[cp]AW[cq]AW[dq]AW[bq]AW[er]AW[fr]AW[gr]C[Black to kill (ko is possible).]AP[goproblems]
(;B[cr]C[];W[br]
(;B[ds]
(;W[bs];B[an];W[cs];B[es];W[fs];B[dr];W[hs];B[ds];W[cr]
(;B[aq]C[RIGHT])
(;B[ar]C[RIGHT]))
(;W[an]
(;B[bs];W[as]C[CHOICE];B[ar];W[aq];B[ap];W[as]C[Well done! See the other variation, it is a nice one ;).RIGHT])
(;B[aq];W[bs])))
(;B[es];W[cs];B[fs];W[an];B[bs];W[aq];B[ap];W[as])
(;B[an];W[ds]
(;B[fs];W[cs])
(;B[aq];W[ar]))
(;B[bs];W[ds]))
(;B[br];W[cr]
(;B[aq];W[ds];B[fs];W[an])
(;B[ds];W[ar]))
(;B[an];W[ds])
(;B[es];W[cr];B[fs];W[an];B[cs];W[bs])
(;B[fs];W[cr];B[es];W[an];B[cs];W[bs])
(;B[cs];W[cr];B[es];W[bs];B[fs];W[an]))