(;AB[sb]AB[rb]AB[ob]AB[od]AB[oc]AB[oe]AB[of]AB[pf]AB[qf]AB[rf]AB[re]AW[qe]AW[pe]AW[pd]AW[pc]AW[qb]AW[rc]AW[rd]AW[sc]AB[sd]AB[mb]C[Black to kill]AP[goproblems]
(;B[pb]
(;W[qc]C[CHOICE];B[qa];W[se];B[ra]C[RIGHT])
(;W[ra]C[CHOICE];B[qc];W[sa];B[qd]C[RIGHT]))
(;B[qc];W[qd];B[pb];W[se]C[Ko])
(;B[qd];W[qc]))