EVENT
BOARDSIZE 19
SETUP W D16 F16 K16 L15 O3 M4 J4 D5 D4 D3 E3 E2 
SETUP B M17 Q16 Q14 Q10 Q4 O5 D2 C3 C2 C4 C6 C7 F3 
MARK A@E7 B@F5 C@F4 \t@C7
COM
Problem 133. White to play.  

Black has just played the marked stone. In this position, which
of the three points indicated is the best way for White to defend
? 
ENDCOM
W 1 F5
MARK A@F4
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White 1 is the correct shape here. It is more efficient than
playing at A.
<=
ENDCOM
  VAR
  W 1 E7
  MARK @@F5 A@F2
  COM
  Failure.

  White 1 is a large-scale move, but unfortunately Black A or @
  could be quite annoying for White later on.
  <=
  ENDCOM
  ENDVAR