(;
AB[jq][nq][ep][fp][np][fo][ho][jo][dn][en][fn][cm]
AW[dq][eq][gq][hq][oq][pp][co][do][eo][pn]
C[Black plays.

Source:  Tesuji Dictionary, Vol. 1, Tsuke #54,
Segoe Kensaku & Go Seigen, Ishi Press];

B[cq]C[Correct.
A frighteningly effective, and worth remembering, tesuji.]
(;
W[dp]
C[If White tries to keep everything...];
B[fq];
W[fr];
B[bp];
W[bo];
B[dr];
W[er];
B[br];
W[ds];
B[cs]
C[Black sets up a one-sided ko for most
of White's corner territory.]
)
    (;
    W[cr]
    C[If White avoids the ko...];
    B[fq];
    W[fr];
    B[dr]
    (;
    W[er]
    C[Best defense.];
    B[br];
    W[ds];
    B[dp];
    W[bq];
    B[cp];
    W[bp];
    B[bo];
    W[ao];
    B[bn];
    W[ar]
    C[White retains some territory, but
Black captures three stones in sente.]
    )
        (;
        W[bq]
        C[Allows Black to take big profit along
the bottom.];
        B[er];
        W[cp];
        B[gr]
        )
    )
)
