(;
GM[1]
SZ[19]
AW[cg][cf][ce][de][ed][fd][gd][dp][pn][og][pi]
AB[cc][cd][dd][ec][fc][be][bf][np][pq][pd][nd][qg]
LB[dn:A][gq:C][nn:B][jq:D]
C[Problem 151. White to play.  

White is satisfied with her thickness in the upper left. However, she would like to use this thickness to build a moyo. Where should she play ? ]
(;W[nn]
TE[2]
C[Correct Answer.  

Since the right side is thin, White should first strengthen it by jumping to 1. ]
;B[lp]
LB[lq:A]
C[Black 2 at A is bad because it is too low. ]
;W[dm]
C[Next, White 3 starts to build a moyo on the left side. <= ]
)
(;W[dn]
C[Failure.  

If White prematurely plays on the left with 1, ... ]
;B[nn]
LB[pk:A]
C[... Black will jump to 2, aiming at an invasion at A. ]
;W[qp];B[qq];W[pl];B[ip]
C[After extending to 6. Black's positions on both the right and left sides have been settled. <= ]
)
)
