(;C[White to play.]AB[qg]AB[rf]AB[qe]AB[pe]AB[ne]AB[pc]AB[oc]AB[mb]AB[ld]AB[kd]AB[kc]AB[kb]AW[qc]AW[qd]AW[nc]AW[nb]AW[mc]AW[lc]AW[lb]
(;W[pb];B[ob];W[oa]
(;B[rb];W[ra];B[sc];W[rc]C[If black 'a' then white 'b' or if black 'c' then white 'd', ko.RIGHT]LB[qb:a]LB[qa:b]LB[sd:c]LB[sb:d])
(;B[qb];W[qa];B[rb];W[ra];B[sb];W[rc];B[pa]C[RIGHT]))
(;W[qb];B[pa];W[qa]
(;B[oa]
(;W[sb];B[rd];W[rc];B[ra])
(;W[rd];B[sd];W[sc];B[rb]))
(;B[rd]))
(;W[pa];B[pb];W[qb];B[oa];W[qa];B[ob]
(;W[rd];B[sd];W[sc];B[rb])
(;W[sb];B[rd];W[rc];B[ra])))