White to win the capturing race  

Karl Knechtel: I didn't read all variations, but I'm pretty sure this simple move is the key. a is an "asymmetrical" shared liberty: White's play there does not cost her a own string a liberty, but Black's does. Since Black must either approach (i.e. connect at b) or block White at the top first in order to capture (i.e. filling the points to the left of White's string without either a or b is simply self-atari), White effectively gains a liberty in the capturing race and is ahead 6 to 5.

Possible continuation:

White is looking good.  

Attempt 2 (failure)  

If White plays W1, Black throws in B2. White can at best get a ko.

GokyoShumyoSection4Problem4/Attempts last edited by Lodestone on July 15, 2010 - 19:09
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