EVENT
BOARDSIZE 19
SETUP W B16 C14 C11 R14 Q10 N17 R16 Q17 Q18 
SETUP B D16 C17 F16 K16 O16 Q16 N16 R17 P17 
MARK 7@Q18 6@P17 5@Q17 4@R17 3@R16 2@N16 1@N17
COM
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 ? 
ENDCOM
B 1 R18
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should force White from the right with 1, ...
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  VAR
  B 1 P18
  COM
  Failure.

  Forcing on the other side with 1 is not good.
  ENDCOM
  W 2 Q15
  B 3 P16
  W 4 R18
  MARK 2@Q15
  COM
  White gets the corner with 2 and 4, and Black's stones at the
  top are overconcentrated.
  <=
  ENDCOM
  ENDVAR
W 2 P18
B 3 O18
COM
... then play 3, ...
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W 4 O17
COM
... inducing White to atari with 4.
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B 5 P16
COM
After Black connects with 5, ...
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W 6 N18
B 7 R15
COM
... he can play 7, breaking into White's moyo on the right. White's
stones at the top are still in danger.
<=
ENDCOM