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