(;C[What is the best white can do here? Play T (at D15) for tenuki if you think there isn't anything.]AW[se]AW[re]AW[qe]AW[qc]AW[qb]AW[ra]AW[pd]AW[od]AW[nd]AW[mc]AW[nb]AW[mb]AW[lb]AW[ka]AW[ja]AW[ib]AW[gb]AW[pf]AW[me]AW[le]AW[mf]AW[mg]AW[mh]AB[sd]AB[rd]AB[qd]AB[rc]AB[rb]AB[pc]AB[pb]AB[oc]AB[nc]AB[md]AB[ld]AB[kd]AB[lc]AB[kb]AB[jb]AB[ic]AB[hc]AB[gc]AB[fb]AB[ke]AB[lf]AB[lg]AB[lh]AB[rf]AB[kg]LB[de:T]
(;W[de]C[Actually, white can get something.])
(;W[pa];B[qa]
(;W[qb];B[oa]
(;W[ob];B[qc]C[Note Black would play ko at R19 rather than here in a game, but we keep things simple. Losing that ko Black would have to play here anyway.];W[na];B[sb]C[Again Black skips playing the ko at R19 for simplicity.]
(;W[la]C[Ko for seki, best for both.RIGHT]TR[qb])
(;W[qa];B[la]C[One eye against no eye - white is unconditionally dead.]))
(;W[qa];B[qc])
(;W[na];B[qc]C[Note Black would play ko at R19 rather than here in a game, but we keep things simple. Losing that ko Black would have to play here anyway.];W[ob];B[sb]C[Again Black skips playing the ko at R19 for simplicity.]
(;W[la]C[Ko for seki, best for both.RIGHT]TR[qb])
(;W[qa];B[la]C[One eye against no eye - white is unconditionally dead.]))
(;W[la];B[qc]))
(;W[ob];B[oa])
(;W[oa];B[sa]))
(;W[sb];B[qa])
(;W[ob];B[qa])
(;W[qa];B[pa]))