(;AW[ad]AW[bd]AW[cb]AW[db]AW[eb]AW[ea]AB[ce]AB[be]AB[ae]AB[dc]AB[ec]AB[fc]AB[fb]AB[fa]AW[ba]AW[ab]AB[de]AB[dd]C[Black can't kill White but has the best result.FORCE]AP[goproblems]
(;B[bb]C[FORCE];W[cc])
(;B[bc]C[FORCE];W[cc]C[FORCE];B[cd]C[FORCE];W[ac])
(;B[cc]C[FORCE];W[bc]C[RIGHT])
(;B[cd]C[FORCE];W[cc]))