(;
AB[nr][mr][mq][jq][hq][gq][fq][pp][qo][co][rn][pn][on][fn][dn][qm][mm][fm][fl]
AW[or][qq][pq][oq][nq][dq][rp][mp][ip][hp][ep][ro][no][fo][in][gn][pm][gm]
C[White plays.

Source:
    Tesuji Dictionary, Vol. 1, Tsuke #88,
    Segoe Kensaku & Go Seigen, Ishi Press]
(;
W[kq]
C[Correct.
Black looks thin in the original position, but this amazing tesuji is the only way to break through.];
B[kr];
W[jr]
C[White follows up with a simple sacrifice.];
B[ir]
C[Otherwise, Black loses the stones to the left.];
W[lr];
B[js];
W[lq]
TR[mq][mr][nr]
C[And Black cannot avoid the loss of the 3 marked stones.]
)
    (;
    W[lq]
    C[Slack.];
    B[lr]
    C[Now Black can connect.];
    W[iq];
    B[ir];
    W[kq];
    B[kr];
    W[jp];
    B[jr]
    TR[mm]
    C[Black lives with all his stones, and White's wall is not worth much given Black's marked stone.]
    )
)

