Did Go World make a mistake on a tsumego problem?
Source:
Problem diagram.
Black plays.
Solution follows
(or click here to download SGF)
Official solution.
Go World gives Black 1 as the only killing move.
After Black 3, White is clearly dead. But see the following
diagrams.
Alternate solution?
Go World says that Black 1 is a mistake, but this
play also seems to kill White. Go World only gives
Black 3 as a follow up. And White 4 will indeed make a 2nd
eye after capuring the 3 Black stones.
But see the next diagram for a better Black attack.
Black refutation.
But Black has the atari at 3 to destroy White's 2nd eye! White dies.
Is Go World's analysis wrong?
White variation.
Note that White could try the counter-attack at 2.
In the sequence that follows, White can capture a couple stones
on the right edge, but White has only 1 eye, and cannot escape
to the center.
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