(;
AB[dr][cr][cq][cp][cn][cm][fq][jq][pq][po][qk][ph][pg][ei][gh][ih][kh]
AW[cl][dl][dm][dp][do][dq][eq][er][jp][mp][ik][kk][fj][ni][og]
TR[jq]
C[White's response to Black's attachment?

Source:
    Go World #4, Nov-Dec 1977, pp. 8-9
    Kato Masao (Black) vs. Takemiya Masaki, 2nd Gosei Title]
(;
W[kq]
C[Too easy on Black.

The invasion and defensive techniques in these variations are instructive.];
B[iq];W[kr]
C[White can cut off access to the right side.];
B[fr]
C[But Black has this forcing play.];
W[es];B[fo]
C[And this force threatens to cut off White's lower left group.];
W[dn];B[ip]
C[And Black lives easily.]
)
    (;
    W[iq]
    C[Better]
    (;
    B[kq]
    C[Kobayashi Koichi said that simply pulling back was good enough.]
    (;
    W[ip];B[mr]
    C[Black has reduced White's moyo somewhat, but in gote.  White's moyo is still intimidating and White now has the choice of continuations. ]
    )
        (;
        W[ir]
        C[White cannot descend here.];
        B[kp]
        C[Black can push up.]
        )
        (;
        W[mq]
        C[And White doesn't have time to descend here.];
        B[ir]
        C[Black's play here is good enough.]
        )
    )
        (;
        B[ir]
        C[In the game, Kato aggressively tries to settle the shape.  The following game line seems to be the best for both sides.];
        W[kq];B[jr];W[hq];B[fr];W[fs]
        C[Best but complicated!];
        B[kp];W[hr];B[jo];W[ip];B[lq];W[ko];B[lp];W[lo];B[mq];W[no];B[np];W[mo];B[oo]
        C[Black has gouged out a large portion of White's moyo, and has solidified the lower right corner.

However, White has sente.  Black went on to win by 5.5 points.]
        )
    )
)

