EVENT
BOARDSIZE 19
SETUP W D16 F7 E6 D6 C5 C4 B3 G4 R6 R9 O17 L17 
SETUP B C14 D11 D8 C3 D4 E5 F5 E3 Q3 R4 R11 R14 Q16 
MARK \t@C14
COM
Problem 64. White to play.  

Black has just played the marked stone. How should White respond
? 
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W 1 C2
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

The atari of White 1 robs the black stones of their base.
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  VAR
  W 1 F16
  MARK \t@C14
  COM
  Failure.

  In the game, White answered the marked stone with 1.
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  B 2 C2
  COM
  Black descended to 2, securing his stones in the lower left.
  Black has a good game because all of his stones are secure.
  <=
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  ENDVAR
B 2 G5
COM
Black has to run away ...
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W 3 J4
B 4 H5
MARK 2@G5
COM
... with 2 and 4, but ...
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W 5 M3
MARK 3@J4
COM
... these moves provoke 3 and 5, enabling White to establish
a position at the bottom.
<=
ENDCOM