(;AB[lm][mm][nm][on][pn][ko][qo][kp][qp][kq][lq][rq][mr][nr][rr]AW[mn][lo][mo][oo][lp][pp][mq][nq][or][pr][qr]C[Black plays.

Source:
    From a Korean life and death booklet.]SZ[19]

(;B[pq]C[Surprisingly, the only move that works!]
(;W[qq];B[no]C[Black makes a 2nd throw in!]
(;W[nn];B[op]C[A truly beautiful double atari, especially given that the entire sequence is the only way for Black to kill.];W[np];B[po]C[White's 2nd eye is false!])
(;W[np]C[Defending from the inside is no better.];B[nn]C[Again, White's 2nd eye is false.]))
(;W[np]C[At 1st glance, defending inside immediately seems to give White adequate eye space.];B[nn]LB[no:A][qq:B]C[But Black's simple push here makes miai of A and B.]))
(;B[no]C[Bad timing.  Black cannot interchange the order of his 1st 2 moves.];W[nn];B[pq];W[np]C[For example, White can dodge to here to immediately form 2 eyes.])
(;B[nn]C[Attacking from the outside doesn't disrupt White's eye space.];W[no];B[qq];W[pq]C[White lives.])
(;B[np]C[Also fails.];W[op]C[The obvious inside attack lets White immediately form good eye shape.]))