Note that the solution MIGHT be a ko IF you cannot live/kill unconditionally.
Information about the problem source can be found
here.
(;AB[oa]AB[pb]AB[pc]AB[qc]AB[rc]AB[rd]AW[ob]AW[oc]AW[od]AW[pd]AW[qd]AW[mb]AW[re]AW[qf]AP[goproblems]
(;W[sd];B[rb]
(;W[qa];B[pa]
(;W[sc]C[RIGHT])
(;W[ra];B[sa]
(;W[sb];B[sc])
(;W[sc]C[RIGHT])))
(;W[sc];B[sb];W[qa];B[ra];W[pa]C[RIGHT]))
(;W[ra];B[sd];W[sb];B[rb];W[qa];B[pa])
(;W[rb];B[sb];W[ra];B[sd]))