(;C[Black plays.

Source:
    "Good and Bad Style"
    Go World #7, p. 63]SZ[19]AB[pd][qd][od][pf][of][jd]AW[md][nc][qc][rd][qe][qf][pg][qh]
(;B[qb]C[The clamp is correct style.]
(;W[rc]C[White has no choice but to connect.];B[ob]TR[nc][md]C[Black makes nice shape in addition to weakening the marked stones.])
(;W[pc]C[The push looks good, but ...];B[oc]C[... Black is happy to force.];W[pb];B[ob];W[rb]TR[nc][md]C[Black weakens the marked stones, while keeping sente.]))
(;B[pc]LB[pb:a][ob:b]C[A crude move.  Black A or B are little better.];W[qb]C[White simply descends.  Black has no good follow up.  Compare this position with the correct line.]))