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Offline HermanHiddema
 Post subject: Another semeai
Post #1 Posted: Mon May 16, 2011 1:29 pm 
Gosei
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Perhaps a little easier than the semeai Bill posted recently, though I think I would still rate this a dan level problem.

It is from a recent game of mine, and my opponent (black, 1 kyu) impressed me by finding best play during the game:

Click Here To Show Diagram Code
[go]$$B Status?
$$ ------------------
$$ | . . . . . . . . .
$$ | . X X . . . . . .
$$ | . . O X . . . . .
$$ | O O O X . X . . .
$$ | . X O O . . . . .
$$ | X . X O . . . . .
$$ | . . X O X . . . .
$$ | . X X X O X . . .
$$ | . X O O O O . . .
$$ | . O O , O . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]
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Offline Dusk Eagle
 Post subject: Re: Another semeai
Post #2 Posted: Mon May 16, 2011 2:15 pm 
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I think this works:

Click Here To Show Diagram Code
[go]$$B Status?
$$ ------------------
$$ | . . . . . . . . .
$$ | . X X . . . . . .
$$ | . . O X . . . . .
$$ | O O O X . X . . .
$$ | 4 X O O 5 . . . .
$$ | X . X O 3 . . . .
$$ | 1 . X O X . . . .
$$ | . X X X O X . . .
$$ | 2 X O O O O . . .
$$ | . O O , O . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]


Of course, white can escape after :b1:, but then black lives.

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We don't know who we are; we don't know where we are.
Each of us woke up one moment and here we were in the darkness.
We're nameless things with no memory; no knowledge of what went before,
No understanding of what is now, no knowledge of what will be.
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Offline HermanHiddema
 Post subject: Re: Another semeai
Post #3 Posted: Mon May 16, 2011 2:22 pm 
Gosei
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@Dusk Eagle:

Sorry, escape is good enough for White :)
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Offline Dusk Eagle
 Post subject: Re: Another semeai
Post #4 Posted: Mon May 16, 2011 5:37 pm 
Gosei
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Hmm, I think (hope :P) I have it this time.
Click Here To Show Diagram Code
[go]$$B Reverts back to my last post
$$ ------------------
$$ | . . . . . . . . .
$$ | . X X . . . . . .
$$ | . . O X . . . . .
$$ | O O O X . X . . .
$$ | . X O O . . . . .
$$ | X 2 X O 1 . . . .
$$ | 3 . X O X . . . .
$$ | . X X X O X . . .
$$ | . X O O O O . . .
$$ | . O O , O . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]


Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ | . . . . . . . . .
$$ | . X X . . . . . .
$$ | 7 9 O X . . . . .
$$ | O O O X . X . . .
$$ | . X O O 5 . . . .
$$ | X 3 X O 1 . . . .
$$ | 2 . X O X . . . .
$$ | 6 X X X O X . . .
$$ | 4 X O O O O . . .
$$ | 8 O O , O . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]


Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ | . . . . . . . . .
$$ | 6 X X . . . . . .
$$ | . 7 O X . . . . .
$$ | O O O X . X . . .
$$ | . X O O 5 . . . .
$$ | X 2 X O 1 . . . .
$$ | 3 . X O X . . . .
$$ | . X X X O X . . .
$$ | 4 X O O O O . . .
$$ | . O O , O . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]


Click Here To Show Diagram Code
[go]$$B
$$ ------------------
$$ | . . . . . . . . .
$$ | . X X . . . . . .
$$ | . . O X 9 0 . . .
$$ | O O O X 8 X . . .
$$ | . X O O 2 3 . . .
$$ | X . X O 1 4 6 . .
$$ | . . X O X 5 . . .
$$ | . X X X O X 7 . .
$$ | . X O O O O . . .
$$ | . O O , O . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]


Click Here To Show Diagram Code
[go]$$Bm11 Doesn't seem to work for white...
$$ ------------------
$$ | . . . . . . . . .
$$ | . X X . . . . . .
$$ | . . O X X O . . .
$$ | O O O X O X 1 . .
$$ | . X O O O X . . .
$$ | X . X O X O O . .
$$ | . . X O X X . . .
$$ | . X X X O X X . .
$$ | . X O O O O . . .
$$ | . O O , O . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . . . . . . .[/go]


This seems to work as far as I can tell.

_________________
We don't know who we are; we don't know where we are.
Each of us woke up one moment and here we were in the darkness.
We're nameless things with no memory; no knowledge of what went before,
No understanding of what is now, no knowledge of what will be.
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Offline HermanHiddema
 Post subject: Re: Another semeai
Post #5 Posted: Tue May 17, 2011 12:43 am 
Gosei
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Posts: 2011
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@Dusk Eagle: Very good, that's it :)

Especially :b3: in your first diagram is, IMO, not easy to spot.
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