(;
GM[1]
SZ[19]
AW[bd][cf][ci][qf][pj][nb]
AB[dd][cc][fd][jd][nd][pd]
LB[nb:1]
C[Problem 64. Black to play.  

This time White invades at 1, a trick move where Black can easily go wrong. What is Black's strongest and safest response ? ]
(;B[qc]
TE[2]
C[Correct Answer.  

Black 1 on the 3-3 point is a safe and steady move. ]
;W[lc]
C[In order to get life, White must jump to 2, but ... ]
;B[ld]
C[... Black confines her to the side with 3. Next, ... ]
;W[kc];B[jc];W[kd];B[ke];W[md];B[me];W[le]
C[... White tries to break out into the center with the moves to 10, but ... ]
;B[lf]
C[... Black keeps White confined to the top of the board with 11. White will have a hard time living. <= ]
)
(;B[nc]
C[Failure.  

This time bumping into White with Black 1 is not a good move. ]
;W[qc]
C[White can jump to 2 and ... ]
;B[qd];W[ob];B[mb];W[rc]
LB[ob:4]
C[... skilfully live with 4 and 6. <= ]
)
)