EVENT
BOARDSIZE 19
SETUP W D16 K3 R5 R10 R13 P17 N17 
SETUP B C10 D4 P4 Q3 R16 Q15 L17 H17 
COM
Problem 160. White to play.  

It is White's turn and if she plays the right move she can seize
the initiative. Where should she play ? 
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W 1 R18
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White 1 is the vital point. With this move, White makes a base
for her stones at the top right and deprives Black a base for
his.
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  VAR
  W 1 F17
  COM
  Failure.

  White 1 puts pressure on the two black stones at the top, but
  ...
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  B 2 Q17
  COM
  ... Black turns the tables on White by attaching with 2. Black
  has taken nearly 10 points of territory and the two white stones
  at the top are under attack.
  <=
  ENDCOM
  ENDVAR
B 2 P14
COM
Therefore, Black must run into the center with 2.
ENDCOM