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Tsumego From Games 21
Path: TsumegoFromGames
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Difficulty: Beginner
Keywords: Life & Death, Problem
This happened to me in a 9x9 game on KGS today. I thought my corner is safe, but then Black played the marked stone. How can White defend the lower left corner?
- Bill: Play there before Black does.
![[Diagram]](../../diagrams/26/3e43989973a88ff6d28f42af03d8393f.png) | Diag.: White to defend |
In the end I made a seki and lost the game.
--Confused
Dave: It does seem to be too late...
![[Diagram]](../../diagrams/16/8379735e2139a98408d03caa7b8e166e.png) | Diag.: White to defend |
White is helpless.
- Bill: Therefore White has nothing better than to pass at move 5, accepting seki.
![[Diagram]](../../diagrams/2/3d4ab315ce11ca2eb13a7c126ea950b6.png) | Diag.: 10,000 year ko |
Bill: If Black has no ko threat, he can still make a 10,000 year ko.
(Note: White cannot take and fill.)
![[Diagram]](../../diagrams/51/c8ac31ade3ffaf61a3a27fd947f31856.png) | Diag.: White to defend |
Seki.
exswoo: Actually, if Black plays this sequence, I think White can force a no result under Japanese rules...although I'm not sure if that's actually a valid strategy :)
![[Diagram]](../../diagrams/44/6646b50b00325861c2204d886a3e0b0e.png) | Diag.: NR! |
![[Diagram]](../../diagrams/26/8586f546c6188b5cc182063e8ca373b5.png) | Diag.: NR! |
- Bill: White can keep doing this, but it costs one point each time. Eventually Black can sacrifice his stones and still win.
- exswoo: Wouldn't the super ko rule forbid that?
- Bill: Depending on the variant of the superko rule, it would prevent White 9.
- Dave: Although it does not work, that is quite a clever idea that I did not notice. Black can also play 9 or a instead of 4 to achieve seki. I just thought 4 looked nicer, which is a careless approach to tsumego :-) Well done exswoo!
- exswoo: Why, thank you :) It would've been even better if it did work but oh well. I wonder if there are any tsumego problems out there where this strategy is the correct answer?
Dieter: Yes Sir, may I suggest problem 85 of the amazing Kanazawa Tesuji Series, also known as Gokyo Shumyo.
Path: TsumegoFromGames
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This is a copy of the living page
"Tsumego From Games 21" at
Sensei's Library.
2003 the Authors, published under the OpenContent License V1.0.
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