(;AB[oc]AB[ob]AB[pd]AB[qd]AB[qf]AB[pf]AW[mc]AW[mb]AW[nd]AW[od]AW[pc]AW[pb]AW[rc]TR[ob]TR[oc]C[Black to save the marked stones.]AP[goproblems]
(;B[qc];W[qb]
(;B[rb];W[ra]
(;B[sb];W[sc]
(;B[pa];W[sa]
(;B[rb];W[sb]
(;B[oa];W[nc]
(;B[qa];W[rb]
(;B[rd]C[RIGHT])
(;B[sd]C[RIGHT]))
(;B[rd];W[nb]))
(;B[rd];W[nb];B[oa];W[nc]))
(;B[rd];W[nb]
(;B[rb];W[sb];B[oa];W[nc])
(;B[oa];W[nc];B[rb];W[sb]))
(;B[sb];W[rb])
(;B[oa];W[rb]
(;B[rd];W[nc])
(;B[qa]
(;W[nc];B[rd];W[nb])
(;W[rd];B[re];W[nc];B[se];W[nb];B[sd];W[na]))))
(;B[rd];W[sa];B[pa];W[nb]
(;B[rb];W[sb];B[oa];W[nc])
(;B[oa];W[nc];B[rb];W[sb]))
(;B[oa];W[pa]))
(;B[rd];W[sb])
(;B[pa];W[sb]))
(;B[rd];W[rb]))
(;B[qb];W[qc];B[pa];W[rb];B[qa];W[ra];B[oa];W[na];B[rd];W[nb])
(;B[rb];W[oa];B[qc];W[nb];B[qb];W[nc])
(;B[rd];W[rb])
(;B[pa];W[rb]))