Tsumego From Games 21
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.
Bill: If Black has no ko threat, he can still make a 10,000 year ko.
(Note: White cannot take and fill.)
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 :)
- Bill: White can keep doing this, but it costs one point each time. Eventually Black can sacrifice his stones and still win.
- Bill: Depending on the variant of the superko rule, it would prevent
.
- Dave: Although it does not work, that is quite a clever idea that I did not notice. Black can also play
or a instead of
to achieve seki. I just thought
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.
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