(;
GM[1]
SZ[19]
AW[dc][ce][ch][jd][mc]
AB[cj][pc][qe]
C[Problem 159. Black to play.  

The position is similar to the one in Problem 157. However, there are some differences. These differences should influence the way you erase White's moyo. ]
(;B[hc]
LB[he:B][jb:A]
TR[jd]

TE[2]
C[Correct Answer.  

Since the marked stone is on the fourth line, light erasing moves such as caps or shoulder hits are not applicable. Black 1 is the perfect point because it aims at White's weak underbelly at A or a jump at B. ]
(;W[he]
C[That is, if White caps at 2, ... ]
;B[jb]
(;W[kc];B[fc]
LB[jb:3]
C[... Black plays 3 and 5, taking profit while making a stable position. <= ]
)
(;W[fc]
C[If White 4 here, ... ]
;B[kc]
LB[hc:1]
C[... Black answers at 5. In any case, as long as there is room to expand, a deep invasion at 1 is possible. <= ]
))
(;W[ic]
C[Variation.  

White might attach at 2. ]
(;B[he]
C[In this case, Black jumps lightly to 3, escaping into the center. ]
;W[hb];B[gc];W[gb]
LB[hb:4]
C[Linking up to her stones at the top with 4 and 6 are big moves, but since White was strong here to begin with, this was to be expected. <= ]
)
(;B[ec]
C[However, Black can prevent White from linking up by exchanging 3 ... ]
;W[dd]
C[... for 4, ... ]
;B[he]
C[... then jumping to 5. ]
;W[hb]
C[If White now plays 6, ... ]
;B[gc]
C[... she can't link up after 7. <= ]
)))
(;B[hd]
C[Failure.  

Playing on the fourth line with 1 is bad. ]
;W[fc]
C[White extends to 2 and Black's stone is without roots or follow-up moves. <= ]
)
(;B[he]
C[Failure.  

Erasing lightly with Black 1 is a failure. ]
;W[hc]
C[White answers with 2, taking profit. <= ]
)
)
