EVENT
BOARDSIZE 19
SETUP W C16 D17 C9 C6 D4 Q5 R5 R9 P5 
SETUP B C14 C11 D2 F3 R4 Q16 Q4 P3 O4 
MARK A@K17 C@J3 B@R11
COM
Problem 130. Black to play.  

The biggest moves are the ones that have big follow-ups. Where
do you think Black should play in this position ? 
ENDCOM
B 1 K17
MARK B@E15 A@F17
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black 1 is a big move because it threatens A. Next, Black would
play B, and a moyo would begin to form in the center.
ENDCOM
  VAR
  B 1 R11
  MARK B@Q7 A@R7
  COM
  Failure.

  Black 1 aims at an invasion at A, but this is not much of a threat,
  since White B would be an adequate response.
  ENDCOM
  W 2 O17
  COM
  Therefore, White will take the initiative and make an approach
  move at 2.
  <=
  ENDCOM
  ENDVAR
W 2 G17
COM
This is not to White's liking, so she counters by extending to
2.
ENDCOM
B 3 R14
COM
But Black plays 3 and he gets a strong position in the upper
right.
<=
ENDCOM