(;
AB[ic][id][mc][md][jd][kd][nd][pd][ce][ee][hf][if][dh][ci][cp][dq][fq]
AW[dc][kc][lc][nc][ed][fd][hd][ld][le][ef][jf][cg][ig][cl][co][do][pp]
C[Black's response to the marked clamp?

Source:
    Internet World Go Championship
    White:  Cho Hunhyun 9P
    Black:  Feng Yun 9P
    Commentary:  Feng Yun 9P
    AGJ, 2005 Yearbook, pp. 14-15]
TR[ef]
(;
B[fe]
C[By trying to run out here, Black falls for White's trap.];
W[ge];B[ff];W[gf];B[fg]
C[Black runs out, but ...];
W[hg]
C[... White will get the marked group.]
TR[ic][id][jd][kd][hf][if]
)
    (;
    B[dg]
    C[In the game, Black avoids the problem in the main line by pushing here.];
    W[cd]
    C[The game continues ...];
    B[de];W[fe];B[hg];W[fg];B[bg];W[jg];B[hh];W[ie];B[he];W[je];B[gd];W[hc];B[gc];W[hb];B[ge];W[ib]
    C[White does capture 4 stones, but compare this result for Black with the main line.]
    )
)

