EVENT
BOARDSIZE 19
SETUP W G17 M17 K16 O18 R14 Q14 R10 
SETUP B D16 E17 C14 O16 Q16 Q18 R15 
COM
Problem 141. White to play.  

How does White invade the corner ? 
ENDCOM
W 1 P17
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White first peeps at 1.
ENDCOM
B 2 P16
COM
Black must defend at 2 to avoid being confined to the corner.
ENDCOM
W 3 R17
COM
White then invades at 3.
ENDCOM
B 4 Q17
W 5 S15
B 6 S16
W 7 R16
B 8 S17
W 9 Q15
B 10 R18
MARK 3@R17
COM
After White 3, the moves to Black 10 are inevitable. White is
satisfied because her stones on the right have become strong.
<=
ENDCOM