(;
AB[dd][de][ec][jd][pd][pj][pp][qp][rp][op][np][lq][qe][nd]
AW[nr][nq][pq][qq][rq][cq][ce][cf][cd][db][dc][qf][pf][ph]
TR[ph]
C[Black's response to White's marked play?

Source:
    "How to Improve at Fuseki"
    Kato Masao 9P
    Go World, Vol. 12, p. 38]
(;
B[qi]
C[Strong.  In almost all cases this diagonal play is correct.]
(;
W[qh]
C[If White meekly blocks here, ...];
B[nj]
LB[ni:A]
C[... Black can continue the attack.

Note that the severe move of A is also feasible.];
W[mg];B[me]
LB[re:A]
C[Now Black aims at A, taking profit while continuing to attack.]
)
    (;
    W[oj]
    C[White can attach here, but ...];
    B[ok];W[nj];B[pi]
    C[... Black takes the vital point for forcing White into bad shape.];
    W[oi]
    C[Blocking here is essential.];
    B[qh]
    C[Black takes away the group's base.];
    W[nf]
    C[After White reinforces here, ...];
    B[nk]
    C[... Black is satisfied with pushing up.]
    )
    (;
    W[ni]
    C[This move may look thin, but is good.];
    B[nj]
    C[The following sequence is standard.]
    (;
    W[mj];B[nk];W[mi];B[mk]
    C[A peaceful result.]
    )
        (;
        W[mi]
        C[If White is worried about Black cutting here in the previous variation, White can also simply extend.];
        B[mj];W[li];B[lj]
        C[The result is reasonable for Black.]
        )
    )
)
    (;
    B[nj]
    C[Jumping immediately is also possible, but lacks severity.];
    W[qj]
    C[For example, White can just concentrate on living.];
    B[qk];W[rj];B[rk];W[pi];B[oj];W[re];B[rd];W[rf]
    C[Black solidifies the outside, but White lives easily.  The result is less than 100% for Black.]
    )
)

