EVENT
BOARDSIZE 19
SETUP W K17 P17 
SETUP B D16 H17 R16 Q15 
COM
Problem 14. Black to play.  

White is overextended. Where should Black invade in this position
? 
ENDCOM
B 1 M17
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black 1 is the correct invasion point.
ENDCOM
W 2 P15
  VAR
  W 2 K15
  COM
  Failure for White.

  If White jumps to 2 with her stone on the left, ...
  ENDCOM
  B 3 O16
  COM
  ... Black confines the white stone on the right with 3. White's
  play here is unsatisfactory.
  <=
  ENDCOM
  ENDVAR
B 3 P14
W 4 O15
MARK 2@P15
COM
If White plays 2 and 4, ...
ENDCOM
B 5 M15
COM
... Black jumps to 5.
<=
ENDCOM