(;
AB[pd][pf][oj][qj]
AW[jc][nc][qc][ne]
C[Black's response to the marked invasion?

Source:
    American Go Journal, v35 #4, p. 45
    (originally from Go Review X, 8 (Aug 1970), pp. 24-28)
    Making Bad Shape, Rin Kaiho 9p]
TR[qc]
(;
B[qd]
C[Poor judgment.  Black blocks off the upper right side, but ...];
W[pc]
C[... Black needlessly gives White extra points at the top.]
)
    (;
    B[pc]
    C[Pushing here 1st is correct judgment.];
    W[pb]
    (;
    B[qd]
    C[Now Black can descend on this side.];
    W[rb];B[rc];W[qb]
    TR[oj][qj]
    C[In sente, Black secures the right side territory in conjunction with the marked stones.]
    )
        (;
        B[ob]
        C[Sometimes this hane is good, but not here.];
        W[qb];B[oc];W[re]
        TR[ob]
        LB[oj:A][qj:A][jc:B]
        C[Black's upper right framework come to nothing.  And Black's marked stone does not have a big influence on the top, because of White's firm position.

Note that if Black did not have the A stones, then Black would have nothing to lose on the right side.  And if the B stone was Black, then the marked stone would have a bigger impact on the top.]
        )
    )
)

