(;
GM[1]
SZ[19]
AW[do][cp][dq][dr][pk][on][pn][po][pp][oq][qq][qr][qe][pe][pg][og][pc][fc][ic]
AB[cc][dd][df][cj][cm][eq][ep][gp][kq][rq][qp][qo][pm][ql][qk][ph][qg][qf]
C[Problem 161. Black to play.  

In this game, White has built up a moyo at the top. How should Black erase it ? ]
(;B[jd]
TE[2]
C[Correct Answer.  

When you look at the thickness on the right, a light erasing move is what comes in your mind. The shoulder hit of Black 1 is the best move. If you play any deeper, your stone will meet with a severe counterattack, so you cannot expect to reduce White's territory any more than this. ]
;W[jc]
C[White answers with 2, ... ]
;B[kd];W[id];B[jf];W[ie];B[lg]
C[... and the joseki to Black 7 follows. <= ]
)
(;B[je]
C[Failure.  

A light erasing move such as Black 1 is inadequate. ]
;W[kd]
C[White is satisfied with the territory she gets after playing 2. <= ]
)
(;B[kc]
C[Failure.  

If you think of a deep invasion, Black 1 is the move, but ... ]
;W[jd]
LB[je:A]
C[... after White 2 or A, Black will come under a severe attack. Black will have to put all his energy into making life on the right. <= ]
)
)