Analysis:
Problem diagram.
White plays.
Solution follows
(or click here to download SGF)
Correct.
Black has 5 liberties while White only has 4. How can White save his stones?!
If White had to rely only on liberties, White would lose the semeai by 1 move.
But White's saving tesuji at 1 threatens to connect out along the top edge! Through 7, White has "lost" the semeai with Black's 4 stones, but has connected out instead.
Although this problem is simple, if you're not paying attention in a game,
the connection sequence is easy to miss!
Black variation.
Cutting White off with Black 4 doesn't work either, because Black reduces
his internal liberties. Through 9, Black loses the semeai by 1 move.
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