EVENT
BOARDSIZE 19
SETUP W E17 H16 L17 R4 P4 C3 D4 C6 
SETUP B C17 D15 C12 P16 R16 R9 D2 F3 H4 
COM
Problem 95. White to play.  

White has to strike at Black's weak point. If White doesn't play
on this point, she will miss her chance to take the lead.  
ENDCOM
W 1 K3
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White must play the checking extension of 1, attacking the weak
underbelly of the three black stones and defending her own weak
stones on the right.
ENDCOM
B 2 J3
COM
Black must play 2 and ...
ENDCOM
  VAR
  B 2 R6
  MARK A@K4
  COM
  Variation.

  Black might not like the exchange of @ for A in the Correct Answer
  because it strengthens White, but if he omits it, ...
  ENDCOM
  W 3 H2
  COM
  ... White will slide to 3.
  ENDCOM
  B 4 H3
  W 5 G2
  B 6 F2
  W 7 K5
  COM
  Black's stones are left without a base after White jumps to 7.
  <=
  ENDCOM
  ENDVAR
W 3 K4
B 4 R6
W 5 Q10
MARK A@M3 1@K3
COM
... the sequence to 5 follows. If White omitted 1, Black would
play A.
<=
ENDCOM