EVENT
BOARDSIZE 19
SETUP W H17 K16 M16 R16 Q14 R10 
SETUP B D17 C15 K17 L16 O16 P17 R18 
MARK 1@L16
COM
Problem 52. White to play.  

Although it looks like a tesuji, Black 1 is a dubious move. How
should White respond ? 
ENDCOM
W 1 L17
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White should atari with 1 and ...
ENDCOM
  VAR
  W 1 L15
  B 2 L17
  W 3 J16
  B 4 M17
  ENDVAR
B 2 L15
W 3 K18
B 4 M17
W 5 J17
B 6 L18
W 7 K17
  VAR
  W 7 M18
  MARK @@K17
  COM
  Instead of connecting at @, White could opt for a ko by playing
  at 7. This could be dangerous for Black.
  <=
  ENDCOM
  ENDVAR
B 8 M18
W 9 F17
MARK B@L14 A@M15
COM
... play the moves to 9 (later White can start a fight with A,
Black B).
<=
ENDCOM