(;AB[sb]AB[sa]AB[ra]AB[qa]AW[sc]AW[rc]AW[qc]AW[pc]AW[pb]AW[pa]AB[rd]AB[qd]AB[pd]AB[od]AB[oc]AB[ob]C[B to kill]AP[goproblems]
(;B[rb];W[qb];B[ra]C[good jobRIGHT])
(;B[sd];W[rb];B[oa];W[qb];B[ra];W[sa];B[sb]C[you can kill without a Ko.CHOICE])
(;B[qb];W[rb]C[W lives :(CHOICE])
(;B[oa];W[rb];B[sd];W[qb];B[ra];W[sa];B[sb]C[you can kill without a Ko.CHOICE]))