(;
AB[pd][ci][cj][ck][dl][el][nl][pl][dn][en][eo][mo][no][oo][dp][dq][cq][eq][nq][oq][pq][gr]
AW[dc][bj][bk][cl][bm][im][cn][co][cp][mn][nn][on][do][po][pp][ep][fp][hp][jp][mp][rp][qq]
C[Black's local response to the marked play?

Source:
29th Oza, Kato Masao 9P(B) v. Hashimoto Shoji 9P
Go World #27, p. 11,  Spring 1982]
TR[mn]
(;
B[ko]
C[If possible, Black would like to run out fast with this plausible looking jump.

Can you read out whether this move is an overplay?];
W[lo];B[lp];W[ln];B[kp]
C[So far Black looks fine, yes?];
W[mq]
C[A curious move!];
B[lq];W[mr];B[nr];W[lr];B[kr];W[jo]
C[Now White's plan should be obvious.];
B[kn];W[km]
C[White has this beautiful squeeze.  In exchance for sacrificing only 4 stones, White minimizes Black's lower territory, while also strengthening the outside thickness and White's stones to the left.]
)
    (;
    B[lo]
    C[For comparison with White's success in the main line, the following is Black's (Kato's) game sequence.];
    W[ln];B[ko];W[kn];B[jo];W[io];B[iq]
    (;
    W[ip];B[jq];W[kp];B[kq]
    C[Black links up at the bottom.  White is still happy to be able to take sente here, but the main line is even better for White.]
    )
        (;
        W[hq]
        C[White can descend here, ...];
        B[ip];W[hr];B[ho];W[in];B[jr];W[gn]
        C[... and locally White is OK.  But ...];
        B[pg]
        C[... Black has sente to switch to the big right side.]
        )
    )
)

