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 Post subject: Dead, Alive, or Seki?
Post #1 Posted: Tue Jul 21, 2020 6:20 am 
Beginner

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Universal go server handle: NewSentiment
Is the group on the left dead, alive, or seki?


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 Post subject: Re: Dead, Alive, or Seki?
Post #2 Posted: Tue Jul 21, 2020 6:42 am 
Lives in gote

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KGS: Tryss
This position is seki :
Click Here To Show Diagram Code
[go]$$B Simplified situation
$$ | . . . . . .
$$ | O O O O .
$$ | X X X O .
$$ | X . X O . .
$$ | . O X O . .
$$ | O O X O . .
$$ | . . X O . .
$$ | X X X O . .
$$ | O O O O . .
$$ | . . . . . .[/go]



- Black can't live with points, because if black try to capture the white stones, it will be captured first

- white can't capture, because if white try to capture, it will give black a living shape inside. The important thing : Black must not play inside until the last moment :

Click Here To Show Diagram Code
[go]$$B Black capture at a
$$ | . . . . . .
$$ | O O O O .
$$ | X X X O .
$$ | X W X O . .
$$ | W O X O . .
$$ | O O X O . .
$$ | a W X O . .
$$ | X X X O . .
$$ | O O O O . .
$$ | . . . . . .[/go]


Click Here To Show Diagram Code
[go]$$B Black capture at a
$$ | . . . . . .
$$ | O O O O .
$$ | X X X O .
$$ | X W X O . .
$$ | W O X O . .
$$ | O O X O . .
$$ | W a X O . .
$$ | X X X O . .
$$ | O O O O . .
$$ | . . . . . .[/go]



Click Here To Show Diagram Code
[go]$$B Black capture at a
$$ | . . . . . .
$$ | O O O O .
$$ | X X X O .
$$ | X W X O . .
$$ | a O X O . .
$$ | O O X O . .
$$ | W W X O . .
$$ | X X X O . .
$$ | O O O O . .
$$ | . . . . . .[/go]



Click Here To Show Diagram Code
[go]$$B Black capture at a
$$ | . . . . . .
$$ | O O O O .
$$ | X X X O .
$$ | X a X O . .
$$ | W O X O . .
$$ | O O X O . .
$$ | W W X O . .
$$ | X X X O . .
$$ | O O O O . .
$$ | . . . . . .[/go]


This post by Tryss was liked by: Bill Spight
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 Post subject: Re: Dead, Alive, or Seki?
Post #3 Posted: Tue Jul 21, 2020 6:54 am 
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Awesome, thanks!

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 Post subject: Re: Dead, Alive, or Seki?
Post #4 Posted: Tue Jul 21, 2020 7:23 am 
Honinbo

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BTW, seki is a kind of life. In fact, mutual life is another term for seki.

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 Post subject: Re: Dead, Alive, or Seki?
Post #5 Posted: Tue Jul 21, 2020 7:49 am 
Lives in gote

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KGS: Tryss
And this is a situation where black can "die in gote". Black is alive (without points), but if black make the mistake of adding another move inside, his group is now dead and white can play elsewhere :lol:

Edit : wait, depending where black add his stone, white may need to answer to kill :roll: Or let black spend another move to save his group (still a seki)

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