(;AW[rq][qq][pq][op][np][mn][mm][ml][nk][ok][pk][ql][rl][rm][qo]AB[nm][nl][ol][pl][pm][on][oo][qm][rn][qp]SZ[19]C[Black to live]
(;B[po]
(;W[ro]C[CHOICE]
(;B[qn]C[RIGHT])
(;B[rp];W[qn]))
(;W[qn]C[CHOICE]
(;B[ro];W[rp]
(;B[pp]C[RIGHT])
(;B[pn]TR[pp][qo]C[RIGHT Black is alive, but there is a better way. White can use either of the marked points as ko-threats.]))
(;B[rp];W[ro])
(;B[pp];W[ro])
(;B[pn];W[ro])))
(;B[ro];W[po])
(;B[qn];W[po])
(;B[pp];W[po])
(;B[pn];W[po];B[ro];W[rp])
(;B[rp];W[po]
(;B[pp];W[ro])
(;B[ro];W[pp])))