EVENT
BOARDSIZE 19
SETUP W D17 R5 R11 P17 
SETUP B C4 P4 Q3 R16 Q15 
MARK \t@P4 \t@R11
COM
Problem 32. White to play.  

White has made a wide extension with her marked stone. How should
she respond to Black's marked stone ? 
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W 1 Q7
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White should play the knight's move of 1, reinforcing her position
on the right side.
<=
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  VAR
  W 1 C15
  COM
  Failure.

  Making a corner enclosure with White 1 ...
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  B 2 R9
  COM
  ... gives Black the chance to invade at 2.
  <=
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  ENDVAR