(;
GM[1]
SZ[19]
AW[dd][dj][dn][dp][jd][nc][kc]
AB[gp][jp][pp][pn][pj][pd][pf][le]
LB[pn:1]
C[Problem 54. White to play.  

Black has strengthened his moyo on the right side with 1, but this is not a good move, as it is premature. Where should White play to punish Black for his mistake ? ]
(;W[jg]
LB[jf:A]

TE[2]
C[Correct Answer.  

White 1 (or A) is the focal point of the two opposing moyos. This move expands White's moyo while reducing the scale of Black's. ]
;B[je]
LB[jf:A][jg:1]
C[The two-space jump of White 1 is thinner than the tight one-space jump at A in the Correct Answer, but it is a lot more severe. Don't worry about Black trying to break through with the sequence from 2 ... ]
;W[ie];B[jf];W[if];B[ig]
C[... to 6. ]
;W[jh]
LB[ig:5][lf:A]
C[After White 7, White can aim at A or capture the black stone at 5 in a ladder. <= ]
)
(;W[jf]
TE[2]
C[Correct Answer.  

Also correct. <= ]
)
(;W[df]
C[Failure.  

White misses her chance to seize the initiative when she meekly defends with 1. ]
;B[je]
C[Black extend the scale of his moyo with 2 ... ]
;W[ie];B[jf]
C[... and 4. White has fallen behind. <= ]
)
)