(;AW[qa]AW[rb]AW[sb]AW[rc]AW[rd]AB[pa]AB[oa]AB[na]AB[mb]AB[md]AB[ne]AB[pd]AB[pe]AW[pc]AW[oc]AB[re]AB[qf]C[Black to kill]AP[goproblems]
(;B[ra];W[sa]
(;B[qb];W[pb];B[ra]C[Only ko])
(;B[pb];W[qb];B[sd]C[RIGHT])
(;B[qc]
(;W[qb];B[sd];W[qd];B[pb]C[RIGHT])
(;W[qd];B[pb];W[qb];B[sd]C[RIGHT])
(;W[pb];B[qd];W[sd];B[qb]C[RIGHT]))
(;B[qd]
(;W[sd];B[qb]C[RIGHT])
(;W[qc];B[pb]
(;W[sd];B[qb]C[RIGHT])
(;W[qb];B[sd]C[RIGHT]))
(;W[pb];B[qc];W[sd];B[qb]C[RIGHT]))
(;B[sd];W[pb]))
(;B[qb];W[ra]
(;B[sd];W[pb])
(;B[pb];W[sd]))
(;B[sd];W[pb];B[qd];W[qc])
(;B[qc];W[pb];B[qd];W[sd]
(;B[qb];W[ra])
(;B[ra];W[qb]))
(;B[qd];W[sd]
(;B[qb];W[ra])
(;B[ra];W[qb]))
(;B[pb];W[sd]
(;B[ra];W[qb])
(;B[qb];W[ra])))