(;
GM[1]
SZ[19]
AW[mc][pc][qf][bd][cf][ci]
AB[cc][dd][fd][jc]
C[Problem 67. Black to play.  

Black wants to invade at the top right. Where should he play ? ]
;B[nd]
TE[2]
C[Correct Answer.  

Black first makes a shoulder hit at 1 and, ... ]
;W[nc]
C[... after White defends at 2, ... ]
;B[qd]
C[... invades the corner with 3. ]
;W[pd];B[qe];W[pe]
LB[pd:4]
C[If White 4 and 6, ... ]
;B[rf];W[qg];B[rg];W[qh];B[qc]
C[... Black lives in the corner with the moves to 11, his invasion is a success. <= ]
)
)