(;
AB[bs][cr][bq][ar][bp][bo][cp][co][cn][do][en][fn][pq][po][pk][pd][qc][pf][cf][bd][ci][hn][di][cj][el]
AW[cc][dd][fd][kc][nc][pb][mp][jp][gp][go][eo][ep][dp][dq][cq][bn][ao][cm][dm][dn][dj][ck][ej]
C[White's response to Black's marked play?

Source:
    Go World #35, Spring 1984, p. 33
    Otake Hideo  vs.  Kato Masao]
TR[el]
(;
W[dl]
C[Careless.

The game line.  White loses a tempo here.];
B[fh]
C[And Black has time to shift the balance of power.
Black's move sets up an invasion at the top.];
W[gj];
B[jm]
)
    (;
    W[gn]
    C[Correct.

A clever defensive tesuji.];
    B[gm];
    W[ei]
    (;
    B[dk]
    C[If Black tries to cut...];
    W[em]
    C[And White is OK.]
    )
        (;
        B[eh]
        C[And if Black continues naturally...];
        W[fh];
        B[eg];
        W[fg]
        C[And White strengthens the top area.]
        )
    )
)
