EVENT
BOARDSIZE 19
SETUP W K17 O17 Q17 
SETUP B D16 H17 M17 Q16 Q14 
MARK 1@Q17
COM
Problem 22. Black to play.  

How does Black respond to White's attachment at 1 ? 
ENDCOM
B 1 R17
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black 1 ...
ENDCOM
W 2 P16
B 3 Q15
COM
... and 3 are a simple way of playing. Later, ...
ENDCOM
  VAR
  B 3 Q18
  COM
  Variation.

  Black 3 here is very strong, but it becomes very complicated.
  <=
  ENDCOM
  ENDVAR
W 4 R18
COM
... White can start a ko by playing 4 ...
ENDCOM
B 5 Q18
W 6 P18
COM
... and 6.
<=
ENDCOM
B 7 P17