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