(;
AB[dd][cd][cc][be][bf][ec][fc][pd][nd][qp][qo][pq][nq][mn]
AW[de][ce][cf][cg][ed][fd][gd][qf][pi][pn][qn][po][dp]
TR[mn]
C[White's response to the marked play?

Source:  "Graded Go Problems", Volume 7, Kiseido Publishing];
LB[pk:A][gp:B][gc:C][bg:D]
C[Hint:  choose from A, B, C, or D.]
(;
W[gp]
C[Correct.  White should stake out a position at the bottom before Black does.];
B[pk]
C[Black's invasion on the right side is a concern, but ...];
W[ol];B[ok];W[nl]
C[... White can move out to handle the fight.]
)
    (;
    W[pk]
    C[Defending the right side is too timid.];
    B[fq];W[dn];B[ip]
    C[Black uses sente to take the lead with the bottom position.]
    )
)

