(;C[White to play.]AB[nb]AB[nc]AB[md]AB[qe]AB[re]AB[rc]AB[oe]AB[ne]AW[rb]AW[qb]AW[pb]AW[ob]AW[rf]AW[qf]AW[sf]AW[of]
(;W[sb];B[oa]
(;W[qd];B[rd];W[pe];B[pd];W[pf];B[qc]
(;W[od];B[oc]
(;W[pc];B[nd]
(;W[se]C[RIGHT])
(;W[sd]C[RIGHT])
(;W[sc]C[RIGHT]))
(;W[sc];B[pc])
(;W[sd];B[pc])
(;W[se];B[pc]))
(;W[pc];B[od]))
(;W[pa];B[ra];W[qd];B[rd];W[pe];B[pd];W[pf];B[qc];W[od];B[oc];W[pc];B[nd]
(;W[sc]C[RIGHT])
(;W[sd]C[RIGHT])
(;W[se]C[RIGHT]))
(;W[ra]C[NOTTHIS]))
(;W[sc];B[sd]
(;W[sb];B[oa]
(;W[qd];B[pd])
(;W[pa];B[ra];W[qd];B[pd])
(;W[pd];B[pe]))
(;W[qc];B[rd];W[sb];B[oa];W[pe];B[pd];W[pf];B[qd];W[od];B[oc]))
(;W[rd];B[qd]
(;W[sd];B[se];W[sb];B[oa])
(;W[sc];B[sd];W[sb];B[oa])
(;W[qc];B[sd]))
(;W[sd];B[rd])
(;W[qd];B[rd]
(;W[sb];B[oa]
(;W[pe];B[pd];W[pf];B[qc];W[od];B[oc];W[pc];B[nd]
(;W[sc]C[RIGHT])
(;W[sd]C[RIGHT])
(;W[se]C[RIGHT]))
(;W[pa];B[ra];W[pe];B[pd];W[pf];B[qc];W[od];B[oc];W[pc];B[nd]
(;W[sc]C[RIGHT])
(;W[sd]C[RIGHT])
(;W[se]C[RIGHT]))
(;W[ra]C[NOTTHIS]))
(;W[pe];B[pd];W[pf];B[qc]
(;W[sb];B[oa]
(;W[od];B[oc];W[pc];B[nd]
(;W[sc]C[RIGHT])
(;W[sd]C[RIGHT])
(;W[se]C[RIGHT]))
(;W[ra]C[NOTTHIS])
(;W[pa];B[ra];W[od];B[oc];W[pc];B[nd]
(;W[sc]C[RIGHT])
(;W[sd]C[RIGHT])
(;W[se]C[RIGHT])))
(;W[od];B[sb];W[oc];B[pc]
(;W[se];B[sd]C[Although this is an easy ko for white, it still is ko or seki, so white is worse off than in the correct answer.])
(;W[sd];B[se]C[Black has two eyes!])
(;W[ra];B[se];W[sc];B[sd]C[Although this is an easy ko for white, it still is ko or seki, so white is worse off than in the correct answer.]))))
(;W[pd];B[pe]C[]
(;W[qd];B[rd])
(;W[rd];B[qd];W[sd];B[qc])
(;W[se];B[rd])
(;W[od];B[qc])
(;W[qc];B[qd]
(;W[sc];B[rd])
(;W[oc];B[od])
(;W[sb];B[oa]
(;W[sc];B[rd])
(;W[sd];B[rd])
(;W[oc];B[od]))
(;W[oa];B[sb])))
(;W[pe];B[pd]
(;W[qd];B[pf])
(;W[pf];B[qd])
(;W[sb];B[oa]
(;W[qd];B[pf])
(;W[pf];B[qd])))
(;W[qc];B[qd]
(;W[sc];B[rd];W[pd];B[pe])
(;W[sb];B[oa]
(;W[sc];B[rd])
(;W[sd];B[rd])
(;W[pd];B[pe]
(;W[sc];B[rd])
(;W[sd];B[rd])
(;W[oc];B[od]))
(;W[pa];B[ra]))))