EVENT
BOARDSIZE 19
SETUP W J17 N18 O17 N16 P16 
SETUP B D16 G17 K16 M17 P17 Q17 R16 R14 
COM
Problem 33. White to play.  

How does White answer Black 1 ? 
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W 1 K17
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White 1 is the only move.
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  VAR
  W 1 J16
  COM
  Failure.

  Pushing up with 1 ...
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  B 2 K17
  W 3 K15
  B 4 J18
  W 5 H18
  B 6 K18
  W 7 H17
  B 8 L15
  COM
  ... results in the moves to 8. The white stones on the right
  now come under attack.
  <=
  ENDCOM
  ENDVAR
B 2 L17
W 3 L18
B 4 M18
W 5 M19
COM
Up to 5, White has linked up with her allies on the right.
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B 6 K18
W 7 L19
B 8 J16
W 9 J18
B 10 H17
MARK A@M15
COM
Later, White can aim at A.
<=
ENDCOM