(;C[Where is the vital point for black.CHOICE]AB[sb]AB[rc]AB[qc]AB[pc]AB[oa]AB[ob]AB[nb]AW[mb]AW[mc]AW[nc]AW[oc]AW[pd]AW[qd]AW[rd]AW[rb]AW[ra]AW[qa]AW[pa]AP[goproblems]
(;B[qb]C[Black lives. Black prevents white from creating a killing shape.RIGHT]MA[pa]MA[qa]MA[ra]MA[rb]MA[qb])
(;B[pb];W[qb]C[Black is dead. White creates a killing shape.]MA[pa]MA[ra]MA[rb]MA[qb]TR[qa])
(;B[sc];W[qb]C[Black is dead. White creates a killing shape.]MA[pa]MA[ra]MA[rb]MA[qb]TR[qa]))