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KanazawaSolution70

 

Kanazawa Discussion 70
   

[Diagram]
Diag.: Is White 1 wrong ?

From KanazawaProblem70. i can't find the refutation for White 1, but it is late too. --Dieter



1. The hane

[Diagram]
Diag.: Attempt 1: the [hane]

Let us consider this to be the basic variation (involving no ko). We will reconsider Black 3 and White 4. 5 and 6 are miai. Black 7 is clearly wrong: White 8 takes the vital point. If now Black 'a', white has enough outside liberties to capture the Black bent four. If not Black 'a', White 'a' makes seki.


[Diagram]
Diag.: Variation at 7

Black 1 here is better: White cannot connect because after Black 3 either Black 'a' will almost fill with a bulky five or White 'a' dies in gote.


[Diagram]
Diag.: Variation at 7 - White's best

This results in ko. White 6 in "attempt 1" is forced (for otherwise Black makes a bent three inside eye?). So we look for a variation at 4.


[Diagram]
Diag.: Variation at 4

This White 1 is the first alternative. It looks like White can escape, but up to 10 her position is hopeless.


[Diagram]
Diag.: Variation at 4

But White 3 here is better: a and b are miai: Black a - White b is symmetric to the first diagram and Black b - White a gives White the time to capture the three stones and make two eyes.


[Diagram]
Diag.: Variation at 4 - Black's best

Black 2 assures ko. At this moment I am not able to tell if it will become double ko (which means life) or not. This surely means I don't understand ko.

(Sigh) Let's suppose it is some sort of ko, still worse than unconditional life. Then we must proceed to an alternative for White 2 in "attempt 1".


[Diagram]
Diag.: Variation at 2

Since White 1 was the correct move in KanazawaSolution70, chances are that it saves the day again. Given KanazawaSolution70, Black 2 is not the answer, but obviously White 2 will make two eyes.



2. Playing the vital point

We're back to where we started. The hane is not the solution, because it enables White to grab the vital point again. So, let's have Black play there himself.

[Diagram]
Diag.: Attempt 2: the Vital point

Please do some of the work. I may continue later.



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