(;
AB[cc][cd][de][ed][fc][gd][hc][ic][jc][ef][dg][eg][fg][eh][fi][gh][ld][qd][pq][op][jp]
AW[qo][kq][dp][cb][dc][eb][fd][gb][gc][hb][jb][kb][cg][dh][di][ei][fj][gj]
C[White's response to Black's marked play?

Source:
    "Go World", #32, Summer 1983, p. 8
    Michael Redmond   vs.  Kajiwara Takeo
    Lightening game.
    Oeda Yusuke commentary.]
TR[jp]
(;
W[jq]
C[Correct.
White retains sente.
The game continued...];
B[ip];
W[kp];
B[jn];
W[ko];
B[hm]
)
    (;
    W[kp]
    C[Bad.];
    B[jo];
    W[ir];
    B[ko];
    W[hp]
    LB[hq:a]
    C[But if White omits this move,
Black has the good continuation
at A.];
    B[cq]
    C[And Black has time to invade
the corner.]
    )
)
