EVENT
BOARDSIZE 19
SETUP W R14 Q10 B16 C14 C11 M17 L16 
SETUP B C17 D16 F16 K16 O16 Q16 M16 
MARK 1@L16
COM
Problem 59. Black to play.  

White wedges in with 1. How should Black respond ? 
ENDCOM
B 1 L15
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should atari from above with 1.
ENDCOM
  VAR
  B 1 L17
  COM
  Failure.

  Playing atari from underneath with 1 is not good.
  ENDCOM
  W 2 L15
  B 3 N17
  W 4 K17
  B 5 M18
  W 6 L18
  B 7 M17
  W 8 J16
  COM
  After White 8, the three black stones on the left will come under
  attack.
  <=
  ENDCOM
  ENDVAR
W 2 L17
B 3 K17
W 4 N16
B 5 M15
W 6 O17
B 7 N15
W 8 N17
B 9 P17
W 10 O15
B 11 P16
W 12 K18
B 13 J18
W 14 L19
B 15 K15
W 16 P18
B 17 Q18
W 18 P19
COM
White lives with the moves to 18, but ...
ENDCOM
B 19 O14
COM
... Black's thickness in the center after 19 is overwhelming.
<=
ENDCOM