EVENT
BOARDSIZE 19
SETUP W C16 E16 H17 C12 O17 P17 Q18 R17 Q14 R14 R11 
SETUP B C10 K17 N17 Q17 Q16 P16 O16 R15 S15 
MARK 4@N17 3@Q18 2@Q17 1@O17
COM
Problem 134. White to play.  

The moves from White 1 to Black 4 are a joseki. What is White's
next move ? There are two correct answers.  
ENDCOM
W 1 N18
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

The hane of White 1 is the usual answer.
ENDCOM
  VAR
  W 1 S18
  USER
  CORRECT ANSWER
  ENDUSER
  COM
  Correct Answer.

  White could also live in the corner by playing 1.
  ENDCOM
  B 2 N18
  COM
  The exchange of 2 ...
  ENDCOM
  W 3 P19
  MARK A@N16
  COM
  ... for 3 is important. After this, White will aim to cut at
  A.
  <=
  ENDCOM
  ENDVAR
B 2 R18
COM
Black cuts with 2 and ...
ENDCOM
W 3 P18
COM
... White connects with 3.
ENDCOM
B 4 S17
COM
Next, Black will play 4, taking the corner, and ...
ENDCOM
W 5 M17
COM
... White will play 5.
<=
ENDCOM