EVENT
BOARDSIZE 19
SETUP W D16 E17 G17 O17 R5 O5 C3 C11 D8 
SETUP B C17 D17 B16 C14 D13 Q16 Q14 R9 N3 Q3 
COM
Problem 97. White to play.  

White's stones at the top are thin and it is clear that she must
reinforce them. But choosing the right point ins crucial. Where
should White play ? 
ENDCOM
W 1 L16
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White 1 is the perfect point not too far from her stone on the
right and an ideal distance from her three stone on the left.
Playing this move high on the fourth line also strikes a good
balance with her stones on the third line.
<=
ENDCOM
  VAR
  W 1 K16
  COM
  Failure.

  You may not think that one line to the right makes much of a
  difference, but, if White plays 1 here, her position at the top
  right is still thin and ...
  ENDCOM
  B 2 M17
  COM
  ... Black will invade with 2.
  <=
  ENDCOM
  ENDVAR
  VAR
  W 1 E4
  COM
  Failure.

  If White 1 here, ...
  ENDCOM
  B 2 L17
  COM
  ... Black will invade at 2.
  <=
  ENDCOM
  ENDVAR