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Beginner Exercise 53 Solution
Black can only get one eye out of the 2x2 space, unless Black can make two diagonal moves in there. After White 1, Black must connect to live and also make an eye at a.
If Black solidifies the eye at a first by playing at 2, that group has only two liberties and it's White's turn, so White wins the semeai (capturing race).
If Black tries to capture first with 2, White attacks the eye at 3. Black cannot solidify the eye at a due to damezumari (shortage of liberties), and if Black captures the two White stones, the eye becomes false when White plays at a.
This does not work. White 3 is forced, to prevent Black getting two eyes directly by capturing at 3; and Black 4 solidifies the eye at a. White needs three moves to capture any black stones while Black needs only one to capture the inside white stones and remove the aji (lingering aftereffects), so White doesn't even have a ko threat here.
This is a copy of the living page "Beginner Exercise 53 Solution" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |