(;
AB[qd][oc][jc][qh]
AW[qj][pq][po][gc][dd]
C[White to play to reduce the upper right corner.

Source
    American Go Journal Vol. 18, No. 4, 1984, pp. 29-30.
    Keshi and Uchikomi, Kaoru Iwamoto.]
(;
W[qf]
C[White can try to invade directly here, but White has to worry about Black solidfying and extending his formation while pressuring the invading stone.]
)
    (;
    W[oe]
    C[White might try starting here, which is the strongest point of attack against the small knight enclosure.  Now Black has  big decision to make.]
    (;
    B[pf]
    C[Black can defend the right side.];
    W[nc]
    C[And White can jump into the top area.];
    B[pc]
    (;
    W[md]
    TR[jc]
    C[Black can now extend toward the center with the marked stone with the idea of attacking White's group later.]
    )
        (;
        W[me]
        C[White can try to make a lighter shape here.];
        B[mc]
        C[However, Black has this severe tesuji response.];
        W[nb];B[nd];W[md];B[mb];W[od];B[na]
        C[This play connects the Black groups and reduces White to an eyeless poor shape, although Black is forced into a low position along the top.]
        )
    )
        (;
        B[nd]
        C[Black can also defend the top side.];
        W[pd];B[pc];W[qe];B[rd];W[mf]
        C[And White has reduced Black's right side framework with a flexible shape.];
        B[pf]
        C[And if Black peeps here ...];
        W[of]
        C[White should NOT connect to protect the 3 stones.];
        B[pe]
        C[And Black cannot cut here.];
        W[pg]
        C[White makes a strong formation, while Black takes only a tiny profit.]
        )
    )
)

