(;
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][rj]
C[Black's response to White's marked overplay?

Source:
    "How to Improve at Fuseki"
    Kato Masao 9P
    Go World, Vol. 12, pp. 37-38]
TR[rj];
B[qj]
C[Correct.  Now White is the one, who is in trouble.]
(;
W[ri]
C[Pulling back seems to give White a base, but ...];
B[rk]
(;
W[qh];B[re]
C[... Black makes territory, while keeping up the pressure on the side group.]
)
    (;
    W[ph]
    C[Now, coming back here to make shape is too late.];
    B[qi]
    C[Simple, but powerful.];
    W[qh];B[rg]
    TR[ri][rj]
    C[Threatens to capture the marked stones.];
    W[rh]
    C[White can save the 2 stones, but ...];
    B[rf]
    C[... White has an eyeless floating group, which Black can attack for more territory.]
    )
)
    (;
    W[rk]
    C[Extending in the other direction is unreasonable.];
    B[ri];W[qi];B[rh]
    C[The following instructive sequence shows how Black can shred White's position.];
    W[rg];B[qh];W[pi];B[oi];W[ph];B[pg];W[oh];B[og];W[nh];B[qg]
    C[White has 3 weak groups between Black thickness at the top and bottom.  Any questions?]
    )
)

