(;AW[ar]AW[br]AB[bs]AB[aq]AW[bo]AW[co]AW[do]AW[dp]AW[dq]AW[dr]AW[ds]AB[ao]AB[an]AB[bn]AB[cn]AB[dn]AB[en]AB[eo]AB[ep]AB[eq]AB[er]AB[es]AW[bp]C[Black can't kill white but has the best result.FORCE]AP[goproblems]
(;B[ap]C[FORCE];W[bq]C[RIGHT])
(;B[bq]C[FORCE];W[ap])
(;B[cp]C[FORCE];W[ap])
(;B[cq]C[FORCE];W[ap])
(;B[cr]C[FORCE];W[ap])
(;B[cs]C[FORCE];W[ap])
(;B[as]C[FORCE];W[ap]))