Gokyo Shumyo, Section 1, Problem 3 / Solution

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Table of contents Table of diagrams
Main line
2 and 3 are miai (i)
2 and 3 are miai (ii)
2 and 3 are miai (ii continued)
Variation
Wrong (i)
Wrong (ii)
Wrong (iii)
Another way to live
Variation
Difference (B4 at W1)


Solution

[Diagram]
Main line  

After B1, which makes an eye at the circled point, a and b are miai for life. B1 at c also lives.

[Diagram]
2 and 3 are miai (i)  

After B3, Black has real eyes at the circled points.

[Diagram]
2 and 3 are miai (ii)  

It seems as if W2 creates a false eye, but the capture of three stones on the first line with B5 results in a real eye.

[Diagram]
2 and 3 are miai (ii continued)  

Even if White throws in at W6, Black lives with B7.


[Diagram]
Variation  

If White captures a Black stone with W2, B3 or a makes a second eye. However, if Black doesn't respond, White a kills the group.


Failure

[Diagram]
Wrong (i)  

B1 at the other 1-2 point is wrong. With W2, Black is dead. Even if Black is allowed two moves in a row, he can't live.


[Diagram]
Wrong (ii)  

When Black plays B1 here, White kills with W2. (W2 at W4 is an inferior way to kill, because after Black W2 and White a, Black gets some concrete threats at c.)


[Diagram]
Wrong (iii)  

Connecting with Black B1, as shown here, is also wrong. W2 and W4 leave a and b as miai for the kill.


Alternative solution

[Diagram]
Another way to live  

Making the eye as large as possible, with B1 here, also lives.

[Diagram]
Variation  
[Diagram]
Difference (B4 at W1)  

To this way of living, White can seal the right side in sente. B6 is necessary to avoid ko.


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Gokyo Shumyo, Section 1, Problem 3 / Solution last edited by hnishy on January 12, 2023 - 03:22
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