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Offline HermanHiddema
 Post subject: A gift for Willemien
Post #1 Posted: Mon Dec 20, 2010 12:08 am 
Gosei
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Posts: 2011
Location: Groningen, NL
Liked others: 202
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Rank: Dutch 4D
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Universal go server handle: herminator
For your corner shapes collection ;)

Also for others of course, as a reading exercise...

Click Here To Show Diagram Code
[go]$$W Status?
$$ -------------
$$ - . . X O O .
$$ - . . X X O .
$$ - . . . X O .
$$ - . . X X O .
$$ - X X X O . .
$$ - O O O . O .
$$ - . . . . . .[/go]


Additional question: does the status depend on the number of outside liberties? If so, how?

This post by HermanHiddema was liked by: emeraldemon
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Offline gonut
 Post subject: Re: A gift for Willemien
Post #2 Posted: Tue Dec 21, 2010 9:36 am 
Dies in gote

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Did you know that in the old days, 20% of go players could solve 80% of tsumego problems? But nowadays, just the opposite is true. ...ahem... (Yes, my statistician jokes are even worse than my go ability.)

Anyway, with no outside liberties:



And with an outside liberty:


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Offline HermanHiddema
 Post subject: Re: A gift for Willemien
Post #3 Posted: Wed Dec 22, 2010 8:33 am 
Gosei
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Posts: 2011
Location: Groningen, NL
Liked others: 202
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Rank: Dutch 4D
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Universal go server handle: herminator
Well, gonut got it completely right :)

Addition:
With at least two outside liberties, one of which can be an approach liberty, black can live without requiring double ko, which is better, because it doesn't give white unlimited ko threats. :)

The four main variations:



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