(;AW[rr][qq][rp][sq][qr][pp][po][pn][mr][mq][nn][ln][kn][jn][jo][io][kr][kq][ir][iq]AB[qp][qo][ro][qm][ql][pr][pq][oq][np][mp][lp][lq][lr][ko][jp]AE[jr]C[Black to live.](;B[ms];W[nr](;B[nq];W[ps];B[os]C[RIGHT Black is alive as it stands in a seki. Connecting at the marked point is not sente for White.]TR[qs])(;B[os];W[nq])(;B[ps];W[nq](;B[ns];W[or])(;B[or];W[ns]))(;B[ns];W[ps])(;B[or];W[ps])(;B[op];W[ps];B[os];W[nq]))(;B[nr];W[ls])(;B[ns];W[ps](;B[nr];W[os])(;B[os];W[nr](;B[nq];W[ls])(;B[ls];W[nq])))(;B[os];W[ls];B[ms];W[ns]))