(;
AB[pd][qf][cc][fc][fd][cf][dg][eg][dp][cq][fq][qp][qo][on][rp][sq][rr][qr][pr][pq]
AW[kc][dd][de][df][fe][ec][ck][cn][bp][oq][np][pp][po][pn][pm][qn][ro]
C[White's response to the marked severe invasion?

Source:
    3rd Kisei Title, Fujisawa Shuko (B) vs. Ishida Yoshio (W)
    Go World, Vol. 14, p. 5]
TR[cc]
PL[W]
(;
W[bd]
C[A tough-minded answer.];
B[eb];W[db];B[ge]
C[Well-timed.  This move prevents a ladder a few moves later.]
(;
W[ff]
C[Necessary, as the variation shows.];
B[dc];W[ed];B[cb];W[fb];B[da]
TR[ge]
LB[gc:A]
C[Note that now the marked earlier play prevents White's ladder starting with A. ];
W[gb]
TR[kc]
C[White moves out toward the marked stone.

Now an extended complicated fight ensues between the several unsettled groups in the upper left quadrant.]
)
    (;
    W[fb]
    C[Too greedy.];
    B[gb];W[ea];B[ff]
    C[Black makes nice central thickness, which cancels out White's thickness in the bottom right.]
    )
)
    (;
    W[eb]
    C[White has to be careful.  This descent is just what Black wants.];
    B[bd]
    (;
    W[ce];B[be];W[cg];B[bf];W[ch]
    TR[ce][cg]
    C[White makes bad shape with this result, so White cannot play this way.]
    )
        (;
        W[cg]
        C[Cutting immediately is no good either.];
        B[ch];W[ce];B[bg];W[be]
        TR[cf][bg][dg][ch]
        C[White can capture the corner in gote, but Black's ponnuki is ample compensation.]
        )
    )
)

