EVENT
BOARDSIZE 19
SETUP W D16 C3 D6 R17 Q17 P17 O17 
SETUP B F4 K4 Q4 Q10 Q16 P16 R16 
MARK 2@D16 6@D6 4@C3 5@F4 7@K4 9@Q10 3@Q4 1@Q16 11@R16 13@P16
MARK 14@P17 8@O17 10@R17 12@Q17
COM
Problem 46. Black to play.  

After White 14, how should Black play so as to make the most
efficient use of his moyo below ? 
ENDCOM
B 1 N15
MARK B@F6 A@O16
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black 1 is the vital point of Black's moyo. Without this move,
White would turn at A and the three black stones in the upper
right would become heavy. Jumping to Black B instead of 1 is
also a good move, but Black must take countermeasures against
White A first.
<=
ENDCOM