EVENT
BOARDSIZE 19
SETUP W C18 D18 C17 C15 C14 B15 A14 B13 F17 F16 F15 Q17 Q15 R10 Q4 K4 
SETUP B B12 C13 D14 D15 D16 D17 E17 E18 G16 G18 J16 M16 M13 E3 C4 D10 
COM
Problem 166. White to play.  

How should White play ? Aim at the cutting points on the left
side ? Pull out the three stones within Black's moyo ? Is there
some other overall strategy ? 
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W 1 M11
MARK A@M10
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

If White did nothing, a two-space jump at Black A would be a
marvellous move. Therefore, White must stop Black somewhere along
this line, and the cap of White 1 is the vital point in this battle
of moyos.
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  VAR
  W 1 F13
  COM
  Failure.

  A move like 1, where White tries to pull his stones out of the
  pit of Black's moyo, ...
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  B 2 G11
  COM
  ... is a losing strategy.
  <=
  ENDCOM
  ENDVAR
  VAR
  W 1 Q3
  COM
  Failure.

  Locally, White 1 is a big move, but ...
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  B 2 M10
  COM
  ... in this game Black 2 is so big that White must first deal
  with is before anything else.
  <=
  ENDCOM
  ENDVAR
B 2 K12
COM
If Black 2, ...
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W 3 K10
COM
... White continues with 3 and White is following a winning grand
strategy.
<=
ENDCOM