(;
AB[cr][dq][eq][fq][kq][oq][cp][gp][lp][eo][go][ko][cn][gn][ln][hl][il][jl][kl][bk][ck][dk][fk]
AW[dr][er][fr][gr][gq][iq][hp][qp][hn][jn][dm][fm][gm][hm][jm][qm][bl][cl]
C[Black plays.

Source:
    Tesuji Dictionary, Vol. 1, Tsuke #64,
    Segoe Kensaku & Go Seigen, Ishi Press]
(;
B[ir]
C[Correct.

Black threatens to make a false eye out
of the point diagonally up and to the left
of this stone.];
W[jr];
B[jq];
W[hr];
B[ip];
W[ho];
B[hq]
C[And Black has a flower-viewing ko.]
)
    (;
    B[jr]
    C[Fails.];
    W[ir]
    (;
    B[ip]
    C[Black makes a White eye false, but ...];
    W[ho];
    B[jp];
    W[ds]
    C[This move saves the day.];
    B[hq];
    W[fs];
    B[hs];
    W[is]
    )
        (;
        B[ds]
        C[If Black takes the key point...];
        W[hs];
        B[ip]
        C[And again tries to reduce White to
one eye...];
        W[ho];
        B[hq];
        W[jp]
        C[White now has this resource.]
        )
    )
)
