(;
AB[qd][nc][qj]
AW[qm][pp]
C[White to invade the upper right formation.

Source:
    Keshi and Uchikomi, Kaoru Iwamoto 9p,
    American Go Journal, Vol. 22, No. 1, p. 27]
(;
W[qf]
C[The crucial point for invasion.];
B[od]
C[The steadiest reply.  This play is correct despite its timid appearance.];
W[qh];B[oj];W[ng]
LB[mj:A][om:B]
C[White has accomplished an invasion, but Black has compensation.
After Black plays A or B, Black has a good fighting position.]
)
    (;
    W[qh]
    C[Invading here is not good.]
    (;
    B[pi]
    C[Now Black can push the White stone more aggressively toward Black's strength in the upper right.];
    W[og];B[qf]
    C[Black has the advantage.]
    )
        (;
        B[qf]
        C[Black can also attack from the top.];
        W[pi];B[ok]
        C[And again White is worse than the correct invasion.]
        )
    )
)

