EVENT
BOARDSIZE 19
SETUP W L17 P16 R16 M16 B16 C14 C11 
SETUP B C17 D16 F16 J17 N17 
MARK 1@M16
COM
Problem 114. Black to play.  

How does Black answer the diagonal move of White 1 ? 
ENDCOM
B 1 Q17
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black hits the vital point of the one-space enclosure with 1,
...
ENDCOM
  VAR
  B 1 P17
  USER
  CORRECT ANSWER
  ENDUSER
  COM
  Correct Answer.

  Black 1 is a move for special situations.
  ENDCOM
  W 2 Q17
  COM
  White answers with 2, ...
  ENDCOM
  B 3 O16
  COM
  ... and Black expands with 3.
  <=
  ENDCOM
  ENDVAR
W 2 R17
B 3 P17
W 4 Q16
B 5 N16
W 6 N15
B 7 L18
W 8 K18
B 9 M18
W 10 K17
B 11 O18
COM
... then lives with the moves to 11.
<=
ENDCOM
  VAR
  B 11 J18
  MARK @@O18
  COM
  Instead of @, Black could also play 11 here.
  <=
  ENDCOM
  ENDVAR