(;AW[aq]AW[bq]AW[br]AW[bs]AW[cq]AW[dr]AB[cr]AB[cp]AB[bp]AB[ap]AB[eq]AB[fq]AB[gr]AW[es]AB[fs]AB[fr]AW[dq]AB[ep]AB[dp]C[Black can't kill White but has the best result.FORCE]AP[goproblems]
(;B[cs]C[FORCE];W[er])
(;B[ds]C[FORCE];W[er])
(;B[er]C[FORCE];W[ds]C[RIGHT]))