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Beginner Exercise 3 Solution
This exercise uses the concept of miai. Black 1 is the only way to live, which makes white 2 and black 3 miai. That is, if white plays at 2, black lives with 3; if white plays at 3 instead, black lives with 2. The concept of miai is such that there are two more or less equivalent points, so each player will get either one.
In solving this exercise, this reference diagram is also very useful. It is the same as the problem except with the two marked stones added, so it becomes a basic T shaped four-space big eye (Farmer's Hat), where the point a is the vital point. If white plays at a, black is killed; if black plays at a black lives.
With the reference diagram it becomes easy to explain why enlarging the eye space at 1 fails. Even though there is no stone at a, the concept is still the same. So white 2 kills the black group. I leave it as an exercise for the reader to see what happens if black plays his first move at a instead.
This is a copy of the living page "Beginner Exercise 3 Solution" at Sensei's Library. (C) the Authors, published under the OpenContent License V1.0. |