(;TR[pa]C[Black has played the marked stone. White to play.]AW[oa]AW[jb]AW[ob]AW[ic]AW[kc]AW[lc]AW[nc]AW[oc]AW[jd]AW[md]AW[od]AW[me]AW[ne]AW[oe]AB[pa]AB[na]AB[kb]AB[lb]AB[mb]AB[qb]AB[mc]AB[pc]AB[rc]AB[ld]AB[pd]AB[le]AB[pe]AB[lf]AB[mf]AB[nf]AB[of]AB[pf]PL[W] (;W[la];B[ka] (;W[nb];B[pb] (;W[ma];B[na] (;W[ma]C[White is safe.RIGHT]) (;W[ja];B[nd])) (;W[ja];B[nd])) (;W[ja];B[pb]C[Seki.]) (;W[pb];B[qa]C[Sente seki for Black.])) (;W[ka];B[la] (;W[nb];B[ja]C[] (;W[ia];B[pb] (;W[ka];B[nd]) (;W[ma]C[Only ko.])) (;W[ma]C[Approach move ko. White could have captured Black unconditionally.]) (;W[pb];B[nd])) (;W[ja];B[pb]C[Seki.])) (;W[nb];B[la]C[Only ko.] (;W[ma]C[Approach move ko. White could have captured Black unconditionally.]) (;W[pb];B[nd]) (;W[ka];B[ja]C[] (;W[ia];B[pb] (;W[ka];B[nd]) (;W[ma]C[Only ko.])) (;W[ma]C[Approach move ko. White could have captured Black unconditionally.]) (;W[pb];B[nd])) (;W[ja];B[pb] (;W[ka];B[nd]) (;W[ma]C[Ko]))) (;W[ma];B[la] (;W[nb];B[pb]C[Only ko.]) (;W[ja];B[pb]C[Gote seki for white.]) (;W[pb];B[qa];W[ja];B[nb])) (;W[nb];B[la]C[Only ko.] (;W[ma]C[Approach move ko. White could have captured Black unconditionally.]) (;W[pb];B[nd]) (;W[ka]) (;W[ja];B[pb] (;W[ka];B[nd]) (;W[ma]C[Ko]))) (;W[pb];B[qa] (;W[ka];B[nb]) (;W[ma];B[nb]) (;W[la];B[nb]) (;W[nb];B[nd])) (;W[ja];B[nb]))