It seems that Peng Quan (black) missed something when he played the marked move.
Make him resign!
(;AB[aa]AB[bb]AB[ac]AB[ad]AB[bd]AB[be]AB[ce]AB[cf]AB[cg]AB[ch]AB[ci]AB[bj]AB[bk]AB[ck]AB[cl]AB[cm]AB[dm]AB[dn]AB[co]AB[dp]AB[cq]AB[bq]AB[fo]AB[go]AB[io]AB[ip]AB[iq]AB[in]AB[im]AB[il]AB[ik]AB[hj]AB[ij]AB[jj]AB[ji]AB[kj]AB[fj]AB[fk]AB[fl]TR[fk]AB[fg]AB[ef]AB[ee]AB[fd]AB[ge]AB[gf]AB[gc]AB[hc]AB[hd]AB[hb]AB[ha]AB[ja]AB[kb]AB[kc]AB[jc]AB[ic]AB[jd]AB[ie]AB[if]AB[li]AB[lh]AB[ld]AB[le]AB[lf]AB[mf]AB[nf]AB[ne]AB[oe]AB[ng]AB[pe]AB[qe]AB[qd]AB[rc]AB[rb]AB[qa]AB[mb]AB[oh]AB[ph]AB[qh]AB[pi]AB[ri]AB[ql]AB[pn]AB[po]AB[pp]AB[qo]AB[rp]AB[so]AB[sp]AB[rq]AB[rr]AB[pq]AB[op]AB[np]AB[no]AB[nn]AB[nq]AB[mq]AB[lr]AB[kr]AB[jr]AB[kq]AB[lo]AB[mj]AB[oj]AW[cb]AW[cc]AW[cd]AW[bc]AB[ec]AW[ed]AW[dd]AW[fc]AW[fb]AW[eb]AW[gb]AW[de]AW[df]AW[dg]AW[dh]AW[bi]AW[di]AW[dj]AW[cj]AW[dk]AW[dl]AW[el]AW[em]AW[fm]AW[gl]AW[gi]AW[hi]AW[ii]AW[jh]AW[ig]AW[hg]AW[hf]AW[he]AW[je]AW[jf]AW[kd]AW[ke]AW[kf]AW[kg]AW[lg]AW[mg]AW[mi]AW[ni]AW[oi]AW[nh]AW[nj]AW[lj]AW[lk]AW[kk]AW[jk]AW[kl]AB[jl]AW[jm]AW[kn]AW[ln]AW[ko]AW[kp]AW[lp]AW[mp]AW[lq]AW[jq]AW[jp]AW[ir]AW[hr]AW[gr]AW[hq]AW[hp]AW[gp]AB[gq]AW[eq]AW[dq]AW[cr]AW[br]AW[aq]AW[ao]AW[bm]AW[ro]AW[rn]AW[qn]AW[pm]AW[pl]AW[pk]AW[pj]AW[qj]AW[rj]AW[rl]AW[om]AW[nm]AW[on]AW[oo]AW[og]AW[me]AW[la]AW[lb]AW[lc]AW[mc]AW[nc]AW[nd]AW[od]AW[pd]AW[ob]AW[pb]AW[qb]AW[qc]AW[ka]AW[qr]AW[qq]AW[qp]C[White to finish it off.]AP[goproblems]
(;W[ho];B[gn]
(;W[hn];B[gm]
(;W[hm];B[hl]
(;W[eo]C[Right. That's where Peng Quan (black) resigned in the game.RIGHT])
(;W[gk];B[eo];W[gj]C[You could have captured 4 stones more, but all right.RIGHT]))
(;W[eo];B[en];W[hm];B[hl];W[fn]C[RIGHT]))
(;W[eo];B[ep];W[fp];B[en]
(;W[hn];B[gm]
(;W[hm]C[RIGHT])
(;W[gk];B[hm]))
(;W[fn];B[gm])))
(;W[eo];B[ep]
(;W[fp];B[en];W[ho]TR[iq]TR[ip]TR[io]TR[in]TR[im]TR[il]TR[ik]TR[ij]TR[hj]TR[fj]TR[fk]TR[fl]TR[jj]TR[ji]TR[kj]TR[li]TR[lh]TR[jl]C[That's right. Black dies.RIGHT])
(;W[ho];B[gn]
(;W[hn]C[yup.RIGHT])
(;W[fp];B[en]
(;W[hn];B[gm]
(;W[hm]C[RIGHT])
(;W[gk];B[hm]))
(;W[fn];B[gm])))
(;W[en];B[fp];W[ho];B[gn];W[hn];B[gm];W[hm];B[hl]))
(;W[gn];B[ho];W[eo];B[en])
(;W[fi];B[fp];W[ho];B[gn];W[hn];B[gm];W[hm];B[hl])
(;W[gk];B[ho];W[gj]C[could be much bigger.])
(;W[gj];B[gk];W[ho];B[gn];W[hn];B[gm]
(;W[eo];B[ep];W[fp];B[en];W[fn];B[hm])
(;W[hm];B[hl];W[eo];B[ep];W[fp];B[en]))
(;W[bp]C[That's not what I meant black missed so it's wrong even if sente (and not a very helpful one).]))