EVENT
BOARDSIZE 19
SETUP W C17 R3 R4 R6 O3 N4 C3 D4 F4 
SETUP B Q16 Q4 P3 O2 O4 O5 L4 B4 C6 C9 
MARK A@K17 D@J3 B@R14 C@R9
COM
Problem 149. White to play.  

The joseki played in the lower right corner has ended in sente
for White. There seem to be a lot of big points for her to play,
but which one is the biggest ? 
ENDCOM
W 1 J3
MARK A@H3
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White 1 is the biggest point. To convince you that it is really
big, imaging the difference if Black were to play at A.
ENDCOM
  VAR
  W 1 K17
  COM
  Failure.

  Another big point, but it takes no actual profit.
  ENDCOM
  B 2 H3
  MARK A@F2
  COM
  Black plays 2. He is now threatening to slide at A, uprooting
  the white stones there.
  <=
  ENDCOM
  ENDVAR
  VAR
  W 1 R9
  MARK A@R8
  COM
  Failure.

  White 1 here defends against Black A.
  <=
  ENDCOM
  ENDVAR
  VAR
  W 1 R14
  COM
  Failure.

  If White 1 here, ...
  ENDCOM
  B 2 O16
  COM
  ... Black will jump to 2, and another move on the side becomes
  necessary.
  <=
  ENDCOM
  ENDVAR
B 2 O17
W 3 R9
COM
<=
ENDCOM