EVENT
BOARDSIZE 19
SETUP W C16 E16 H17 C12 R17 P17 R14 Q14 R11 
SETUP B K17 C10 P16 O16 Q16 R15 S15 
MARK 1@P16 \t@P17
COM
Problem 128. White to play.  

Connecting with Black 1 is an obvious move. In response, White
has two possibilities. Where are they ? 
ENDCOM
W 1 O17
MARK A@O18
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White can play either 1 or A. Both of these moves are joseki.
<=
ENDCOM
  VAR
  W 1 Q17
  COM
  Failure.

  Connecting at 1 is heavy.
  ENDCOM
  B 2 O17
  COM
  Black plays 2 and, ...
  ENDCOM
  W 3 O18
    VAR
    W 3 S18
    COM
    White 3 here is better, she just manages to live.
    <=
    ENDCOM
    ENDVAR
  B 4 N18
  W 5 P19
  MARK 3@O18
  COM
  ... after 3 and 5, ...
  ENDCOM
  B 6 Q18
  W 7 R18
  B 8 T18
  MARK 6@Q18
  COM
  ... kills White with 6 and 8.
  <=
  ENDCOM
  ENDVAR
  VAR
  W 1 O18
  USER
  CORRECT ANSWER
  ENDUSER
  COM
  Correct Answer.

  Also correct.
  <=
  ENDCOM
  ENDVAR