EVENT
BOARDSIZE 19
SETUP W D17 D15 H17 H15 C10 R17 R16 S15 T14 R14 Q14 P13 S13 
SETUP B K17 K15 Q17 Q16 Q15 R15 S16 S17 P14 O13 
MARK 3@O13 2@P13 1@P14
COM
Problem 92. White to play.  

Black 3 is an overplay. How does White take advantage of it ?
ENDCOM
W 1 R18
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White should descend to 1.
ENDCOM
B 2 Q18
COM
If Black 2, ...
ENDCOM
  VAR
  B 2 S18
  COM
  Failure.

  If Black saves his corner with 2, ...
  ENDCOM
  W 3 Q18
  COM
  ... White turns at 3.
  ENDCOM
  B 4 P18
  COM
  After 4, ...
  ENDCOM
  W 5 P15
  MARK B@P17 A@O14
  COM
  ... White ataris at 5, threatening to capture one stone at A
  or four stones at B.
  <=
  ENDCOM
  ENDVAR
W 3 S18
COM
... White will play 3, capturing two stones in the corner.
<=
ENDCOM