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