EVENT
BOARDSIZE 19
SETUP W D17 C6 D3 Q18 R18 R17 R16 R14 R13 O17 O15 O13 
SETUP B E18 F16 D15 B15 Q4 P18 P17 Q17 Q16 Q15 Q14 Q13 Q12 
MARK A@Q12
COM
Problem 122. White to play.  

How should White attack the black stones after Black extends
to A ? 
ENDCOM
W 1 P11
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

White should play the shoulder hit of 1.
ENDCOM
B 2 R12
W 3 R10
B 4 S12
W 5 S14
B 6 R9
W 7 Q9
B 8 S10
W 9 R8
B 10 S9
COM
Black struggles to get a position on the right side, but ...
ENDCOM
W 11 Q8
COM
... White gets a lot of influence on the outside with 11. Black,
for his part, has gained almost no territory.
<=
ENDCOM