(;
AB[qc][co][pq][oq][qp][po]
AW[op][np][nq][dc][dq]
TR[co]
PL[W]
C[White's response the marked play?

Source:
    American Go Journal, Vol. 33, No. 4, p 17
    Sakata Eio 9P  vs.  Go Seigen 9P]
(;
W[dl]
C[In some circumstances, with the stone in the top left, White's pincer here might work well for the left side.  But in this case the pincer is a thoughtless mistake in direction.];
B[gq]
C[Instead of jumping out, Black will play here at the bottom.];
W[do];B[jq]
C[Black makes an ideal extension on the bottom, and ...];
W[cp]
TR[nq][np][op]
C[... White does create a lower left position.  Unfortunately, White's marked lower right stones are now in a precarious position.]
)
    (;
    W[fp]
    C[Correct direction.];
    B[jp]
    C[Black still jumps into the lower side, but ...];
    W[cf]
    TR[np][op][nq][jp]
    C[... White uses sente to take a big top left point.  Now White's marked lower right stones are not in as precarious position, because Black's marked lower stone is weaker.]
    )
)

