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Two By Three Box Discussion
I thought I was Captain Smooth by making my little 2x3 box, but I didn't recognize the death that lay waiting with white's 2. D'oh!
Why does it kill?
At this point, the best black can do is to trap three in a row, which is dead. For the most part, once you've lost both 2-2 points, you're dead in the corner. -- Scartol
Both 2-2 points? ummm...
Note that this only works because of damezumari that occurs in the corner. On the side, or in the middle this is alive as it is:
RMDow?: The same is true for 2x3 in the corner with 2 or more external liberties (black is alive). When there is exactly 1 liberty, the best white can do is to play a ko to create BentFourInTheCorner Dieter: I disagree: White makes a two-stage ko. There is no BentFourInTheCorner in the sense that it is dead by the rules. This a ko fully played out.
unkx80: I have added this in response of a query in Kanazawa Solution 24, and I think it is appopriate to post it here. In this diagram, black is dead. No, this is not a seki. Why?
After white 1 and 3 fills up all the external liberties, the marked black stones are caught in a connect-and-die.
If black 1 prevents the connect-and-die at any point of the game, he turns his group into a straight three big eye instead and dies in gote. This is a copy of the living page "Two By Three Box Discussion" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |