(;
AB[qc][pd][pf][pj][qj][rj][rq][qp][pp][po][oq][lq][ed][fd][ef][df][cf][hp]
AW[lp][jp][eq][cp][ck][dd][de][ce][ec][kc][nc][pb][rk][ql][rm][qn][qo][rp]
TR[lp]
C[Black's response to the marked play?

Source:
    Go World #18, pp. 6-7
    Kato Masao 9P vs. Ishida Yoshio
    27th Oza Title, game 2]
(;
B[kq]
C[In the game, Kato played this natural looking push.  However, Kato later said that this move is a mistake.];
W[jq]
TR[hp]
C[The problem for Black is that when White blocks here, Black's marked stone is weaker.];
B[kp]
C[The game continues as follows.];
W[jo]
(;
B[fp];W[ep];B[ko];W[in];B[gn];W[hl]
C[White has a severe attack, although Black's lower left group eventually lives.]
)
    (;
    B[ko]
    C[This push is the wrong order of moves.];
    W[in];B[fp]
    C[Now if Black extends here, ...];
    W[fn]
    LB[ep:A]
    C[... White might attack even more severely on top, instead of blocking at A.]
    )
)
    (;
    B[lr]
    C[Kato said that this descent would have been better.];
    W[in]
    C[When White continues the attack here, ...];
    B[fp]
    TR[lr]
    C[... Black still responds here.  But the difference with the game is that in an emergency, Black can connect underneath to the marked stone.  As a result, White would not be able to attack the lower left stones as severely as in the game.]
    )
)

