(;
GM[1]
SZ[19]
AW[bd][cf][ci][qf][pj][mc][qd][pc][pb]
AB[dd][cc][fd][jd][nd][pd][md][qc][oc]
LB[pb:7][oc:6][pc:5][qc:4][qd:3][md:2][mc:1]
C[Problem 65. Black to play.  

White 1 and 3 are also trick moves. Black 4 and 6 are natural responses, but what does Black do after White 7 ? ]
(;B[qb]
TE[2]
C[Correct Answer.  

Black should force White from the right with 1, ... ]
;W[ob];B[nb]
C[... then play 3, ... ]
;W[nc]
C[... inducing White to atari with 4. ]
;B[od]
C[After Black connects with 5, ... ]
;W[mb];B[qe]
C[... he can play 7, breaking into White's moyo on the right. White's stones at the top are still in danger. <= ]
)
(;B[ob]
C[Failure.  

Forcing on the other side with 1 is not good. ]
;W[pe];B[od];W[qb]
LB[pe:2]
C[White gets the corner with 2 and 4, and Black's stones at the top are overconcentrated. <= ]
)
)