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Kanazawa Problem 3 / Solution
Sub-page of KanazawaProblem3
Authors:
Main line: HashimotoUtaro 9p
After 1, making an eye at the circled point, a and b are miai for life.
After 3, Black has real eyes at the circled points.
It seems as if White 2 makes the eye false, but the capture of three stones with 5 results in a real eye.
Even if white throws in at 6, Black lives with 7.
If White captures at 2, Black 3 makes a second eye. If Black doesn't respond, White a kills the group.
The other 1-2 point is again not successful. With 2, Black is left on the spot. Even if allowed to play two moves in a row, he can't live any more.
When Black plays 1 here, White can choose between a and b to kill Black. Someone with an opinion which is the better ?
We must look at the ko threats black has. Here black can make two eyes by playing both 'a' and 'b', so either of them can be used as a ko threat. However, this is the only threat black can have from this position.
Here black will again live by having both 'a' and 'b', so they are both ko threats. Again, no more threats for black. So, are the moves equal?
Let's say the ko was crucial enough that white had to ignore this threat. Can white have ko threats of her own to kill black again, if another big ko appears in the game?
Here, however, white can make a threat to kill the black group without a ko (by filling at
Also wrong is Black 1 here. White 2 and 4 leave a and b as miai for the kill.
Making the eye as large as possible, with Black 1 here, seems to be correct as well, but it is not the solution from the book. After White 2, Black 3 follows, and Black lives as shown. White 3 is followed by Black 2, White a, Black 7. White 7 is answered by Black 3. White 4, Black 7. White 5, Black 4.
If Black 1 is a mistake, then it must be because White can next play at 2. If Black now plays 3, White 4 kills the entire black group. But ...
... when Black throws in at 3, White fails. The authors of the variations shown here, have not yet found the reason why 1 in the main line is preferred to 1 here.
I received the following suggestion. White 2 is sente against Black 1. If Black doesn't answer ...
4 at 1. The result is ko.
Black lives with
To avoid that, maybe White should start with
White's descent here is not sente.
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