EVENT
BOARDSIZE 19
SETUP W B16 C14 C11 R14 Q10 O18 
SETUP B D16 C17 F16 K16 O16 Q16 
MARK 1@O18
COM
Problem 64. Black to play.  

This time White invades at 1, a trick move where Black can easily
go wrong. What is Black's strongest and safest response ? 
ENDCOM
B 1 R17
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black 1 on the 3-3 point is a safe and steady move.
ENDCOM
  VAR
  B 1 O17
  COM
  Failure.

  This time bumping into White with Black 1 is not a good move.
  ENDCOM
  W 2 R17
  COM
  White can jump to 2 and ...
  ENDCOM
  B 3 R16
  W 4 P18
  B 5 N18
  W 6 S17
  MARK 4@P18
  COM
  ... skilfully live with 4 and 6.
  <=
  ENDCOM
  ENDVAR
W 2 M17
COM
In order to get life, White must jump to 2, but ...
ENDCOM
B 3 M16
COM
... Black confines her to the side with 3. Next, ...
ENDCOM
W 4 L17
B 5 K17
W 6 L16
B 7 L15
W 8 N16
B 9 N15
W 10 M15
COM
... White tries to break out into the center with the moves to
10, but ...
ENDCOM
B 11 M14
COM
... Black keeps White confined to the top of the board with 11.
White will have a hard time living.
<=
ENDCOM