(;AP[goproblems]AW[ar]AW[cr]AW[cs]AW[cq]AW[bp]AW[bo]AB[bn]AB[an]AB[cn]AB[co]AB[cp]AB[dq]AB[dr]AB[ds]C[Black to kill. (by sacrificing a stone)](;B[bq];W[aq](;B[ap];W[br](;B[ao]C[RIGHT])(;B[as];W[ao])(;B[bs];W[ao]))(;B[bs];W[br])(;B[br];W[bs])(;B[ao];W[ap]))(;B[ap];W[bq];B[ao];W[bs])(;B[ao];W[bq](;B[ap];W[bs])(;B[bs];W[ap]))(;B[bs];W[ap](;B[br];W[bq])(;B[ao];W[br])(;B[bq];W[br]))(;B[br];W[bq](;B[bs];W[ao])(;B[ao];W[ap])))