EVENT
BOARDSIZE 19
SETUP W D17 D15 C10 H17 H15 R17 R16 S15 
SETUP B K17 K15 Q17 Q16 R15 S14 Q10 
MARK 3@S14 2@S15 1@R15
COM
Problem 86. White to play.  

Black aggressively blocks with 3. How should White respond ?
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W 1 R14
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White should atari with 1 ...
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  VAR
  W 1 Q18
  USER
  CORRECT ANSWER
  ENDUSER
  COM
  Correct Answer.

  White could also play 1 here, but this is a difficult variation.
  <=
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  ENDVAR
B 2 Q15
W 3 S13
COM
... and 3. This is the same as the Failure Diagram in Problem
83.
<=
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B 4 S16
  VAR
  B 4 Q14
  COM
  Black could also atari at 4. Either way, White will have no problems.
  <=
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  ENDVAR
W 5 T14
B 6 S17
MARK 4@S16
COM
Black captures two stones with 4 and 6.
<=
ENDCOM