EVENT
BOARDSIZE 19
SETUP W C16 E16 H17 C12 Q14 R14 R11 
SETUP B C10 K17 O16 Q16 R15 
COM
Problem 119. White to play.  

This position often occurs in games and we are going to analyse
it extensively. Where is the best place for White to invade ?
ENDCOM
W 1 R17
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

If you want the corner, White 1 at the 3-3 point is the place
to play.
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ENDCOM
  VAR
  W 1 M17
  USER
  CORRECT ANSWER
  ENDUSER
  USER
  CORRECT ANSWER
  ENDUSER
  COM
  Correct Answer.

  Invading on the side with White 1 is also correct.
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  ENDCOM
  ENDVAR