(;
AB[ba][ca][bb][db][dc][ec][ed][fd][gd][ic][ib][jc][he][ie][ge][ha]
AW[ab][bc][cb][cc][dd][de][ee][fe][jb][ia][ja][kb][kc][lc][mc][nc][bd]
TR[ja]
C[Black's response to the marked play?

Source:  derived from a pro game at the 16th Samsung Cup.]
(;
B[jj]
LB[hb:A]
C[In many similar situations, Black does not need to protect the cut at A.  But here, if Black tenukis, White has a nasty surprise!];
W[hb]
C[At first glance, the cut doesn't seem to work.];
B[ga];W[ea]
C[A beautiful double threat.  Now Black has to take at least a roughly 10 point loss.]
(;
B[gb]
C[Blocking here captures the cutting stone, but ...];
W[da]
C[... White captures 3 stones and reduces Black's territory at the top.]
)
    (;
    B[da]
    C[Black can save the 3 stones to the left, but ...];
    W[gb]
    C[... White captures 2 stones, and Black's top territory has all but vanished.]
    )
)
    (;
    B[hb]
    C[Slack.  Black correctly protects the cut, but Black has an even better move.]
    )
    (;
    B[da]
    LB[hb:A]
    C[Best.  Give yourself full credit, if you found this move.

Note that later Black does not need to connect at A, thereby increasing his territory by 1 point over the previous variation.]
    )
)

