EVENT
BOARDSIZE 19
SETUP W C14 D14 C11 M17 N16 N14 Q17 Q16 R15 
SETUP B C15 D16 F16 K17 O17 P16 P15 
MARK 3@N14 2@P15 1@Q16
COM
Problem 90. Black to play.  

Continuing from Problem 87, White defends at 1 and jumps to 3.
How should Black answer ? 
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B 1 P13
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should simply jump to 1 and, ...
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  VAR
  B 1 R14
  USER
  CORRECT ANSWER
  ENDUSER
  COM
  Correct Answer.

  Black could also attach at 1.
  ENDCOM
  W 2 Q15
  COM
  If White 2, ...
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  B 3 P14
  W 4 Q14
  B 5 P13
  W 6 Q13
  B 7 P12
  COM
  ... Black and White move down the right side with the moves to
  7. White's stones on the left now fall in the shadow of Black's
  thick wall.
  <=
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  ENDVAR
W 2 R13
COM
... after White defends the right side with 2, ...
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B 3 O12
COM
... play the diagonal move of 3.
<=
ENDCOM