EVENT
BOARDSIZE 19
SETUP W C12 K17 M17 Q17 R14 
SETUP B D17 C14 H17 O17 
MARK 2@M17 1@O17
COM
Problem 82. Black to play.  

White pincers the marked Black stone with 2. If you've never
seen it before, Black's next move might surprise you.  
ENDCOM
B 1 Q15
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black 1 is an interesting move. There are other moves, such as
attaching at A or B. However, you should not neglect to learn
the variation starting with Black 1.
<=
ENDCOM
  VAR
  B 1 O15
  COM
  Failure.

  Simply jumping out with Black 1 ...
  ENDCOM
  W 2 Q15
  COM
  ... lets White defend the corner with 2. This is a steady move
  and there are no longer any weaknesses in White's position.
  <=
  ENDCOM
  ENDVAR
  VAR
  B 1 Q16
  USER
  CORRECT ANSWER
  ENDUSER
  COM
  Correct Answer.

  Also possible.
  <=
  ENDCOM
  ENDVAR
  VAR
  B 1 R17
  USER
  CORRECT ANSWER
  ENDUSER
  COM
  Correct Answer.

  Also possible.
  <=
  ENDCOM
  ENDVAR