EVENT
BOARDSIZE 19
SETUP W C17 D16 F16 H16 K16 O17 F3 D4 C13 D13 D12 D11 E11 
SETUP B Q16 Q14 Q10 Q4 K4 B16 B14 C14 D14 E14 G14 E12 F12 
COM
Problem 58. Black to play.  

Black's stones in the upper left are a bit cramped. How should
he play so as to take the lead in this game ? 
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B 1 G10
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should play the knight's move at 1. This move threatens
the five white stones in the upper left side, ...
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  VAR
  B 1 Q6
  COM
  Failure.

  If Black immediately strengthens the right side with 1, ...
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  W 2 G10
  COM
  ... White will take the initiative with the knight's move of
  2, expanding her moyo in the left and attacking the black stones
  in the upper left. Moreover, the potential scale of Black's moyo
  has been greatly reduced.
  <=
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  ENDVAR
W 2 D7
COM
... so White must respond with 2. If White omits this move, Black
3 at 2 is a severe attack.
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B 3 Q6
MARK A@O4
COM
Next, Black strengthens his moyo on the right with 3 (or A).
<=
ENDCOM