EVENT
BOARDSIZE 19
SETUP W D16 C11 D9 D8 D6 D4 G4 J4 M4 
SETUP B F3 F4 F5 F7 E9 E10 J6 Q3 Q16 
MARK A@M6 D@J2 B@O4 C@Q5
COM
Problem 147. Black to play.  

The white stones at the bottom are weak, so Black must find a
good way to attack them. Note that Black gave White territory
on the left in order to get a thick  position in the center.
ENDCOM
B 1 M6
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should play a large-scale move by capping at 1.
ENDCOM
  VAR
  B 1 O4
  COM
  Failure.

  Black 1 is very bad because ...
  ENDCOM
  W 2 M6
  COM
  ... it drives White into the center, compromising Black's thickness
  there.
  <=
  ENDCOM
  ENDVAR
W 2 D2
MARK A@G3
COM
White 2 is a good move because it prepares for White A, which
threatens to link up or help her group at the center bottom to
make eyes.
<=
ENDCOM
  VAR
  W 2 O3
  COM
  If White 2 here, ...
  ENDCOM
  B 3 Q5
  COM
  ... Black 3 has a good feel to it.
  <=
  ENDCOM
  ENDVAR