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Seki can still be used as a ko threat [#2311]

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Sebastian: Seki can still be used as a ko threat (2010-06-16 00:14) [#7767]
[Diagram]
sacrificial ko threat  

This isn't quite the usual ko threat, because if Black answers it, White actually loses 3 points. For Black, it's not very useful, because if B1 at W1, the gain for Black is only 3 points, while the loss would be much higher.

X
MrTenuki: Re: Seki can still be used as a ko threat (2010-06-16 02:08) [#7769]

Please correct me if I'm wrong, but it seems to me that more than three points are at stake (Japanese rules are assumed):

[Diagram]
Scenario A: White uses the corner as a ko threat, and Black ignores  

17 points for White.

[Diagram]
Scenario B: White uses the corner as a ko threat, and Black responds  

7 points for Black (note that White can get another ko threat by putting the 1-1 stone into atari).

[Diagram]
Scenario C: Black uses the corner as a ko threat, and White responds  

19 points for White.

[Diagram]
Scenario D: Black uses the corner as a ko threat, and White ignores  

5 points for Black.

Sebastian: Re: Seki can still be used as a ko threat (2010-06-16 10:59) [#7773]

You're right; I miscounted.

koks: Re: Seki can still be used as a ko threat (2010-06-16 11:18) [#7774]

MrTenuki: 7 points for Black (note that White can get another ko threat by putting the 1-1 stone into atari).

I think it is not a ko threat as the best white can do is to turn the local situation back to seki again. So black can ignore that move of white.

 
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