(;
AB[qp][qo][po][oo][on][om][nl][pk][qj][qi]
AW[qq][pq][pp][np][pn][mn][pm][lm][pl][ol][nk][mk][pj][oj]
C[Black plays

Source:
    Qi Jing Zhong Miao #458, an ancient collection of mostly kyu level life and death problems.

Side variation analysis:
    Myron Souris]
(;
B[rm]
C[The connection tesuji!];
W[rl]
C[White's best try.];
B[ql];W[qm];B[qk];W[rn];B[ok]
C[The sequence up to here is forced.]
(;
W[qn];B[sm];W[ro];B[rp];W[nm];B[so]
C[And Black connects, but just barely!]
)
    (;
    W[sm]
    C[Capturing here is a big loss for White.];
    B[qn];W[rm];B[nm];W[ro];B[rp]
    C[White can neither make life nor win the semeai.]
    )
)
    (;
    B[ql]
    C[Bad timing.  The order of moves is important!];
    W[qn]
    C[Now White can dodge to here.];
    B[rn];W[rm];B[qm];W[ok]
    C[If Black still wants to connect, the sequence to here is forced.]
    (;
    B[ro]
    C[If Black prevents the capture, ...];
    W[qk]
    C[... then White capture the 2 stones above.]
    )
        (;
        B[rl]
        C[If Black captures the lone stone here, ...];
        W[ro]
        C[... White counter-cuts.];
        B[sm];W[rp]
        C[And the biggest part of Black's groups is cut off.]
        )
    )
)

