(;
GM[1]
SZ[19]
AW[fc][kd][nd][nc]
AB[df][dd][oc][pd][pf]
C[Problem 45. Black to play.  

There are so many places where Black can invade. Where do you think is the best point ? ]
(;B[id]
TE[2]
C[Correct Answer.  

Black should play near White's strong side with 1. This is the correct invasion point. ]
;W[fe]
C[If White jumps to 2, ... ]
;B[if]
C[... Black is also happy to jump to 3. Black has split White into 2 groups.  <= ]
)
(;B[hd]
C[Failure.  

Even though it is high, playing 1 one line to the left is dubious. ]
;W[hc];B[ic];W[id]
LB[hc:2]
C[White 2 and 4 hit the mark, Black cannot get a good result. <= ]
)
)