(;AW[qa]AW[rb]AB[qb]AB[qc]AB[qd]AB[rd]AB[re]AB[se]AB[oa]AB[ob]AW[nb]AW[nc]AW[oc]AW[sf]AW[rf]AW[qe]AW[pd]AW[oe]AW[qf]C[White gets Seki!]AB[sc]AB[pc]AP[goproblems]
(;W[na]
(;B[pb]
(;W[ra]
(;B[sb];W[rc]C[RIGHT])
(;B[rc];W[sb]C[RIGHT]))
(;W[rc]
(;B[sb];W[ra]C[RIGHT])
(;B[ra];W[sa]C[RIGHT]))
(;W[sb];B[ra]))
(;B[ra]C[This does not help black.];W[sa]
(;B[sb]C[This is a mistake by black, even if he can win any ko.];W[pb];B[ra];W[pa];B[rc]C[Equivalent with seki, both get 5 points. Gote for black.RIGHT])
(;B[pb];W[rc]C[Still seki.RIGHT])))
(;W[pa];B[ra];W[sa];B[rc])
(;W[ra]
(;B[sb]
(;W[pb];B[pa];W[na];B[pb])
(;W[na];B[pb];W[rc]C[RIGHT]))
(;B[rc];W[na];B[pb];W[sb]C[RIGHT]))
(;W[sb];B[ra])
(;W[sa];B[rc]
(;W[pb];B[pa];W[na];B[pb])
(;W[na];B[pb]))
(;W[pb];B[pa];W[ra];B[sb];W[na];B[pb])
(;W[rc];B[sb];W[ra];B[pa];W[na];B[sa]))