EVENT
BOARDSIZE 19
SETUP W H17 F16 E16 D16 C16 D10 D6 D4 C3 Q5 Q6 R6 Q10 M16 
SETUP B B17 C17 D17 F17 F18 D2 F3 Q3 O3 R4 R5 Q12 R16 P17 
MARK A@H4 B@J4 C@J3
COM
Problem 135. Black to play.  

Black has taken a lot of profit, while White is staking the game
on influence. It is now urgent for Black to play at the bottom,
but which of the three points indicated should he play ? 
ENDCOM
B 1 H4
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black 1 on the fourth line makes a good high-low balance with
his stone on the right. An invasion at A remains, but this would
cause White's moyo on the left to be reduced.
ENDCOM
  VAR
  B 1 J3
  COM
  Failure.

  Black 1 is too low.
  ENDCOM
  W 2 H4
  COM
  White can force with the sequence from 2 ...
  ENDCOM
  B 3 H3
  W 4 F4
  COM
  ... to 4, expanding her moyo on the left.
  <=
  ENDCOM
  ENDVAR
  VAR
  B 1 J4
  COM
  Failure.

  Black 1 is bad shape.
  <=
  ENDCOM
  ENDVAR
W 2 R14
COM
If White 2, ...
ENDCOM
B 3 S8
COM
... Black will invade at 3.
<=
ENDCOM