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Beginner Exercise 170 / Solution
Sub-page of BeginnerExercise170
I may be wrong, but I think living with this top group is the best black can do... I see no way for the bottom group to live. I'd be interested in seeing if there's any better outcome :) --Hikaru79
JoelR: White can choose to fight a ko for the whole group instead, by playing LukeNine45: Exactly what I had in mind.
This also seems to be a option, with the same choices for white (ko for the whole thing, or let the top live unconditionally):
ChrisSchack: (In response to the original diagram): White wouldn't play this way if not planning to start the ko, it gives up 4 points for the same result. LukeNine45: You're right, this is a much more consistent way for white to play. (If you delete our exchange after you read it, the page will make a little more sense for the passer-by :)
This ko does not favor white, as black takes first and white will need a huge ko threat. Bill: The first diagrams are the normal way of playing. Typically White will not be able to fight the ko effectively, and Black will live without the ko. If White can afford to play the ko, Black should still start with the atari in the first diagram. White's response is as in the second diagram.
If, instead, White plays
This shows that
All of these are very minor points, but fairly clear. Avoiding
This is a copy of the living page "Beginner Exercise 170 / Solution" at Sensei's Library. ![]() |