(;
AB[gb][gc][gd][kb][kc][ec][jd][je][gf][hf][if][fg]
AW[jb][hc][ic][lc][mc][pc][he][ie][ke][kf][me][jf]
C[Black plays.];
B[jc]
C[Correct.  Black cannot let White take this point in sente.];
W[ib]
(;
B[ka]
C[A common descent tesuji, especially with liberty shortages present.];
W[lb];B[ia]
C[Now Black can attach underneath.];
W[ja]
C[White can cut, but has to reduce his own liberties.];
B[hd];W[id];B[ge]
C[Black wins the semeai.];
W[ha];B[hb]
)
    (;
    B[ja]
    C[Immediately reduces White's liberties, but a mistake.];
    W[ia]
    C[Now in this semeai, White has an option to capture a stone to increase liberties.]
    (;
    B[hd];W[id];B[ge];W[lb];B[ha];W[ka]
    )
        (;
        B[ha];W[lb];B[ka];W[id]
        )
        (;
        B[lb];W[mb];B[hd];W[id];B[ge];W[la]
        )
    )
)

