(;SZ[19]AB[ce][ee][qd][pq][po]AW[dc][fd][cg][oc][dp]C[Black's response to the marked play?

Source:
    American Go Journal, Fall 1992
    "How to Choose Joseki", by Yilun Yang]TR[fd];C[Hint:  A or B?]LB[dh:a][hd:b]
(;B[dh]C[Correct.  Black's shoulder hit is appropriate when White is on the star point in the lower left.  The following sequence shows why.];W[cd];B[be];W[ch]C[Black forces White into a low position on the left side.];B[di];W[dg];B[eg];W[ci];B[dj];W[ck];B[df];W[hd]
;B[el];W[cl]C[This sequence has been a one-way street.];B[cq]C[Black can now make the ideal invasion in the corner.  White cannot avoid becoming over-concentrated on the left side.])
(;B[hd]C[The pincer here is wrong when the top right is advantageous for White.];W[fe]C[A joseki follows in the upper left.];B[dg];W[fg];B[ch];W[cd];B[cf]C[Black ends in gote.];W[kd]C[White can now make this pincer and perfect extension.  Black's pincer stone has become a target for attack.]))