EVENT
BOARDSIZE 19
SETUP W D17 C4 R5 P5 O4 
SETUP B E3 N3 Q3 P3 R16 P17 
COM
Problem 76. White to play.  

What should White do ? Should she make a corner enclosure or
should she take a big point ? 
ENDCOM
W 1 R10
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.  

Taking the big point of White 1 is the only move. White not only
makes an extension from her three stones below, but she also
limits how far Black can extend from his corner enclosure above.
ENDCOM
  VAR
  W 1 R11
  MARK @@R10
  USER
  CORRECT ANSWER
  ENDUSER
  COM
  Correct Answer.  

  White 1 here is also possible, but White @ is the preferred move.
  <= 
  ENDCOM
  ENDVAR
  VAR
  W 1 D15
  COM
  Failure.

  Making a corner enclosure with 1 is out of the question.
  ENDCOM
  B 2 R10
  COM
  Black 2 becomes too good a move. It is an ideal extension from
  his corner enclosure above and it makes the three white stones
  below thin.
  ENDCOM
  W 3 R8
  COM
  If White strengthens them by extending to 3, ...
  ENDCOM
  B 4 P10
  COM
  ... Black jumps to 4, expanding his moyo on the upper right side.
  <=
  ENDCOM
  ENDVAR
B 2 C15
COM
If Black makes an approach move at 2, ...  
ENDCOM
W 3 R14
COM
... White extends all the way to 3, threatening Black's corner
enclosure.  <= 
ENDCOM