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2006-10-30
Problem diagram.
White plays.
Source:
Tesuji, Ch. 5, pp. 80-81
James Davies, Ishi Press
Solution follows
(or click here to download SGF)
Natural and wrong.
Both White and Black have four liberties,
so shouldn't White be able to easily win the
semeai with White 1?
Black 2 unleashes a nasty surprise.
Through 5, White lets Black off with a two step ko.
Yes, White has the advantage in this ko, but White
could have killed Black unconditionally.
Correct.
The White descent to 1 does the trick.
After 5, White wins because Black still
has to make an outside move at A.
Black variation.
Black can try to complicate things with 2 (at 6),
but after White 9, Black runs out of liberties.
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