EVENT
BOARDSIZE 19
SETUP W J16 K17 M16 R14 Q10 
SETUP B D16 D14 D10 J17 K16 N15 O16 Q16 
COM
Problem 61. Black to play.  

A ladder towards the left would be favourable for Black. What
is his strongest play ? 
ENDCOM
B 1 K15
USER
CORRECT ANSWER
ENDUSER
COM
Correct Answer.

Since the ladder is favourable for Black, 1 is a powerful move.
ENDCOM
W 2 H17
B 3 J18
W 4 H18
B 5 K18
W 6 L17
B 7 L18
W 8 M18
B 9 N17
COM
With the moves to 9, White's stones at the top are in trouble.
Next, ...
ENDCOM
W 10 M17
B 11 H16
COM
... Black ataris with 11, but, ...
ENDCOM
W 12 J15
B 13 J14
W 14 H15
B 15 G16
W 16 H14
B 17 G17
COM
... after the moves to 17, ...
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W 18 M15
B 19 K14
W 20 M14
MARK 18@M15
COM
... White must escape into the center with 18 and 20.
ENDCOM
B 21 H13
COM
After Black 21 the top left quarter of the board is dominated
by Black.
<=
ENDCOM