(;
AB[pd][pf][jd][le]
AW[fc][md][me][jf]
C[Black plays.

Source:
    "Good and Bad Style"
    Go World, Vol. 14, pp. 35-36]
(;
B[lf]
C[A mistake.];
W[ld]
C[A good forcing move.];
B[ke]
C[Black is not strong enough to allow White to split these stones, so Black must connect.  But with this empty triangle, Black has forced himself into bad shape.]
)
    (;
    B[kf]
    C[The correct shape here is worth remembering.];
    W[kg];B[lf]
    C[Black makes an empty triangle, but now White's stones are weaker than the main line.]
    (;
    W[ld]
    C[White can force here again, but ...];
    B[je]
    C[... Black can connect with more pressure against White's stones than in the main line.]
    )
        (;
        W[je]
        C[White can try to take the vital point, but ...];
        B[ld]
        C[... Black descends with good shape to maintain pressure on White's stones.]
        )
    )
)

