EVENT
BOARDSIZE 19
SETUP W C15 C10 C4 E4 S4 R6 R9 
SETUP B D17 K3 O4 Q4 R3 R11 R16 
COM
Problem 94. White to play.  

Playing at the top is now urgent, but whatever move White makes
should have a relationship with her stones on the left side.
Where should she play ? 
ENDCOM
W 1 E16
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White should press with 1 ...
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  VAR
  W 1 H3
  COM
  Failure.

  If White plays 1 here, ...
  ENDCOM
  B 2 E16
  COM
  ... Black will play 2 without hesitation.
  <=
  ENDCOM
  ENDVAR
  VAR
  W 1 G17
  COM
  Failure.

  If White pincers with 2, ...
  ENDCOM
  B 2 E16
  COM
  ... Black plays 2 ...
  ENDCOM
  W 3 K17
  B 4 C16
  W 5 D15
  B 6 B16
  COM
  ... to 6, securing the corner.
  ENDCOM
  W 7 H3
  COM
  If White now extends to 7, ...
  ENDCOM
  B 8 C12
  MARK 1@H3 2@E16
  COM
  ... Black invades at 8, so White won't be able to make a moyo
  on the left side. If it were Black's turn, he would play 2, so
  White 1 provokes the move Black wants to play.
  <=
  ENDCOM
  ENDVAR
B 2 E17
W 3 F16
COM
... and 3, ...
ENDCOM
B 4 G17
W 5 H15
COM
... then jump to 5, mapping out a moyo on the left side.
ENDCOM
B 6 H17
COM
If Black next defends at 6, ...
ENDCOM
W 7 H3
COM
... White will fortify her position at the bottom by extending
to 7.
<=
ENDCOM