EVENT
BOARDSIZE 19
SETUP W D16 K16 O17 D4 Q5 R4 R3 Q7 
SETUP B Q16 Q14 Q9 Q3 K4 O4 R2 S2 
MARK 1@Q7
COM
Problem 27. Black to play.  

This time White has tried a different tack by jumping along the
fourth line with 1. What should Black do ? 
ENDCOM
B 1 F3
MARK C@R9 B@O7 A@O9
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Black doesn't really have a convincing attack against the four
white stones on the right. If he jumps to A, White will follow
him out by jumping to B. Black's best move is to make an 'iron
pillar' at C. However, White doesn't have any convincing moves
here either. Therefore, it is best for Black to leave the situation
as it is and switch to the left side by approaching with Black
1.
<=
ENDCOM