(;
GM[1]
SZ[19]
AW[cc][ed][jc][qi][oi][po][qn][pm][fp][cq][cl]
AB[lc][oc][qd][qg][qo][qp][pq][nq][cj][ce][dg]
LB[je:A]
TR[fp]
C[Problem 69. Black to play.  

White has just played the marked stone, but playing at A would have been better What should Black do ? ]
;B[gc]
TE[2]
C[Correct Answer.  

Black 1 is the point to invade. ]
;W[fc]
C[White has to defend her corner with 2. ]
;B[gd]
C[After Black 3, ... ]
;W[ef]
C[... White defends with 4, but this move has little effect on the black stones on the left. ]
;B[je]
C[Black now caps with 5. ]
;W[kd]
C[If White runs away with 6, ... ]
;B[lf]
C[... Black traps the white stone with 7. ]
;W[mc]
C[White 8 is a tesuji-like move, but, ... ]
(;B[mb]
C[if Black calmly links up underneath with 9, ... ]
;W[ld];B[kb]
C[... then defends with 11, White's stones are still trapped. <= ]
)
(;B[md]
LB[mc:8]
C[Failure.  

If Black aggressively counters White 8 by blocking on the outside with 9, ... ]
;W[ld];B[mb];W[me];B[nc];W[kf]
LB[nc:13]
C[... White 14 becomes an effective tesuji after Black captures with 13. Black can't keep White confined. <= ]
)
)
