(;
AB[ok][om][pm][qn][rn][op][oq][pp][qq][rq][pr]
AW[qk][qm][rm][nn][no][pn][po][qp][rp]
C[Black plays.

Source:
    "Tesuji", James Davies]
(;
B[sp]
C[Mistake.];
W[so]
C[For example, White can simply block here.];
B[sn];W[sm];B[sq];W[qo]
)
    (;
    B[so]
    C[This edge tesuji ensures the saving of the 2 stones.]
    (;
    W[sp]
    C[Blocking doesn't work.];
    B[qo]
    C[White is the one with the liberty shortage.]
    )
        (;
        W[qo]
        C[Connecting saves the 2 stones, but ...];
        B[sp]
        C[... Black connects his 2 stones.]
        )
    )
)

