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