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Beginner Exercise 53 Solution
Black can only get one eye out of the 2x2 space, unless he can make two diagonal moves in there. After white 1, in order to live black must connect and also make an eye at 'a'.
If black solidifies the eye at 'a' first, that group has only two liberties and it's white's turn, so white wins the semeai.
If black moves to capture first, white attacks the eye. Black cannot solidify the eye at 'a' due to damezumari, and if he captures, white will falsify the eye.
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, so white doesn't even have a KoThreat 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. |