(;AB[bb]AB[bc]AB[cc]AB[dc]AB[ec]AB[fc]AB[gc]AB[hc]AB[ic]AW[cb]AW[db]AW[eb]AW[fb]AW[gb]AW[hb]AW[ca]AB[jb]AB[kc]AW[ia]AB[ka]C[Black can't kill White but has the best result.FORCE]AP[goproblems]
(;B[da]C[FORCE];W[ib])
(;B[ea]C[FORCE];W[ib])
(;B[fa]C[FORCE];W[ib])
(;B[ga]C[FORCE];W[ib])
(;B[ha]C[FORCE];W[ib])
(;B[ib]C[FORCE];W[ha]C[RIGHT])
(;B[ja]C[FORCE];W[ib]))