(;
AB[pd][pf][pj][pp][cf]
AW[dd][dp][jd][nc][ch]
TR[ch]
C[Black's response to the marked play?

Source:
    American Go Journal, Vol. 33, No. 3, p. 26
    Go Seigen, "Way to Play for the 21st Century"]
(;
B[ef]
C[An often-played sequence, but ...];
W[fc];B[di];W[ce];B[bf]
C[... although Black is out into the center, the subsequent fighting involves some difficulty for Black.]
)
    (;
    B[cc]
    C[Instead, invading the 3-3 point leads to a simple and clear result.]
    (;
    W[dc]
    C[If White blocks on this side, ...];
    B[cd];W[de];B[bf];W[eg];B[lc]
    C[... after settling the corner, Black can invade here.];
    W[ld];B[kd];W[kc];B[ke];W[lb];B[eh]
    C[Now Black can play this ladder blocker.  (Reading the ladder is an exercise for the reader.)  This result is very good for Black.]
    )
        (;
        W[cd]
        C[White can also block on this side, but the following result is not bad for Black either.];
        B[dc];W[ed];B[bd];W[be];B[bc];W[ce];B[fc];W[nq]
        C[Assume more fairly standard moves follow.];
        B[lq];W[qq];B[pq];W[qp];B[po];W[pr];B[or];W[qr];B[oq];W[qn];B[cn];W[fq];B[bp];W[cq];B[ck]
        C[Counting territory:
    The upper left and lower right corner are equal.
    Black's group heading toward the lower left is bigger than White's group heading toward the upper right.
    Black's 3 stone upper right group is bigger than the White's lower left corner.

So overall, Black is fairly far ahead.]
        )
    )
)

