EVENT
BOARDSIZE 19
SETUP W E3 D17 P17 R5 
SETUP B C4 R16 Q15 Q3 
MARK 1@E3 \t@Q15
COM
Problem 16. Black to play.  

After Black plays the marked stone, the approach move of White
1 is not good. How should Black take advantage of this mistake
? 
ENDCOM
B 1 R9
MARK \t@R5
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black should take this opportunity to pincer the marked white
stone with 1. This move makes a nice extension from Black's two
stones above. Black has now taken the initiative on the right
side.
<=
ENDCOM