EVENT
BOARDSIZE 19
SETUP W C16 E16 H17 R17 R14 Q14 R11 C12 
SETUP B K17 O16 Q16 Q17 R15 C10 
MARK 1@Q17
COM
Problem 122. White to play.  

Black 1 is a tight move. Where should White play next ? 
ENDCOM
W 1 S15
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White should play 1.
ENDCOM
B 2 S16
  VAR
  B 2 R16
  COM
  Variation.

  Black could also play 2 ...
  ENDCOM
  W 3 S16
  B 4 S17
  MARK A@S18
  COM
  ... and 4. The point A is left for the endgame. Both these variations
  are satisfactory for White.
  <=
  ENDCOM
  ENDVAR
W 3 R16
B 4 S17
W 5 Q15
  VAR
  W 5 R18
  COM
  White 5 here would be disastrous for White.
  <=
  ENDCOM
  ENDVAR
B 6 R18
COM
The moves to 6 are a well-known joseki.
<=
ENDCOM