(;
AB[jd][od][pd][qd][of][pf]
AW[nc][qc][md][rd][qe][qf][pg][qh]
C[Black plays.

Source:
Go World #23, p. 46
"Good and Bad Style"]
(;
B[pc]
C[Yes, this descent keeps White from connecting, but is a vulgar way to accomplish the objective.];
W[qb]
C[By simply descending, White's corner is stronger and Black has to respond again.]
)
    (;
    B[pb]
    LB[ob:A]
    C[(Or A.)  Also not forceful enough.]
    )
    (;
    B[qb]
    C[Attaching here is good style.  White has multiple options.]
    (;
    W[rc]
    C[If White solidly connects, ...];
    B[ob]
    C[... Black makes good shape.  Compare this result with the previous variations.]
    )
        (;
        W[pc]
        C[Pushing here might seem good for White, but ...];
        B[oc];W[pb];B[ob];W[rb]
        TR[qb][nc][md]
        C[... Black is happy to sacrifice the marked stone, because White's marked stones become even weaker.  And Black now has an option to tenuki.]
        )
    )
)

