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Offline yoyoma
 Post subject: Texas-sized tedomari
Post #1 Posted: Tue Jul 30, 2013 11:13 am 
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Why are all these tedomari problems puny 1 point differences?

Find the best line of play for both sides (maximize the score). Solve for both black to play first and white to play first.

Click Here To Show Diagram Code
[go]$$ Texas-sized tedomari
$$ ---------------------------------------
$$ | . . . . . . . . O X . . . . . . . . . |
$$ | O O O O O O O O O X X X X X . . . . . |
$$ | O . O X X X X X . X . X . X . . . . . |
$$ | O O O X X X X X O X X X X X . , . . . |
$$ | O . O X X X X X O X . . . . . . . . . |
$$ | O O O O O O O O O X . . . . . . . . . |
$$ | . . . . . . . . O X . . . . . . . . . |
$$ | . . . . . . . . O X . . . . . . . . . |
$$ | O O O O O O O O O X X X X X . . . . . |
$$ | O . O X X X X X . X . X . X . , . . . |
$$ | O O O X X X X X O X X X X X . . . . . |
$$ | O . O X X X X X O X . . . . . . . . . |
$$ | O O O X X X X X O X . . . . . . . . . |
$$ | . . O O O O O O O X . . . . . . . . . |
$$ | . . . . . . . O X . . . . . X X X . . |
$$ | O O O O O O O O X X X X X X X , X . . |
$$ | . O . X X X X O X O O O O O X X X . . |
$$ | O O . X X X X O . O O O O O X . X . . |
$$ | . O X X X X X X . X X X X X X X X . . |
$$ ---------------------------------------[/go]



Inspired by the recent threads about this problem:
http://senseis.xmp.net/?EndgameProblem24


Last edited by yoyoma on Tue Jul 30, 2013 12:38 pm, edited 1 time in total.
This post by yoyoma was liked by 2 people: Bill Spight, oren
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Offline jts
 Post subject: Re: Texas-sized tedomari
Post #2 Posted: Tue Jul 30, 2013 12:19 pm 
Oza
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But... but... who has the move?
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Offline yoyoma
 Post subject: Re: Texas-sized tedomari
Post #3 Posted: Tue Jul 30, 2013 12:39 pm 
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jts wrote:
But... but... who has the move?


I edited the OP. Solve it for both cases. :)
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Offline Charlie
 Post subject: Re: Texas-sized tedomari
Post #4 Posted: Wed Jul 31, 2013 5:36 am 
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My answer: white to play...

Click Here To Show Diagram Code
[go]$$W Answer: White to Play
$$ ---------------------------------------
$$ | . . . . . . . . O X . . . . . . . . . |
$$ | O O O O O O O O O X X X X X . . . . . |
$$ | O . O X X X X X 2 X . X . X . . . . . |
$$ | O O O X X X X X O X X X X X . , . . . |
$$ | O . O X X X X X O X . . . . . . . . . |
$$ | O O O O O O O O O X . . . . . . . . . |
$$ | . . . . . . . . O X . . . . . . . . . |
$$ | . . . . . . . . O X . . . . . . . . . |
$$ | O O O O O O O O O X X X X X . . . . . |
$$ | O . O M M M M M 1 X . X . X . , . . . |
$$ | O O O M M M M M O X X X X X . . . . . |
$$ | O . O M M M M M O X . . . . . . . . . |
$$ | O O O M M M M M O X . . . . . . . . . |
$$ | . . O O O O O O O X . . . . . . . . . |
$$ | . . . . . . . O X . . . . . X X X . . |
$$ | O O O O O O O O X X X X X X X , X . . |
$$ | . O . X X X X O X O O O O O X X X . . |
$$ | O O . X X X X O 3 O O O O O X . X . . |
$$ | . O X X X X X X 4 X X X X X X X X . . |
$$ ---------------------------------------[/go]


White captures 20 stones and saves 10 stones. Black saves 29 stones. Black forces white to play a sente move as the second last move in the game which suits black perfectly.


Black to Play

Click Here To Show Diagram Code
[go]$$B Answer: Black to Play
$$ ---------------------------------------
$$ | . . . . . . . . O X . . . . . . . . . |
$$ | O O O O O O O O O X X X X X . . . . . |
$$ | O . O X X X X X 3 X . X . X . . . . . |
$$ | O O O X X X X X O X X X X X . , . . . |
$$ | O . O X X X X X O X . . . . . . . . . |
$$ | O O O O O O O O O X . . . . . . . . . |
$$ | . . . . . . . . O X . . . . . . . . . |
$$ | . . . . . . . . O X . . . . . . . . . |
$$ | O O O O O O O O O X X X X X . . . . . |
$$ | O . O M M M M M 2 X . X . X . , . . . |
$$ | O O O M M M M M O X X X X X . . . . . |
$$ | O . O M M M M M O X . . . . . . . . . |
$$ | O O O M M M M M O X . . . . . . . . . |
$$ | . . O O O O O O O X . . . . . . . . . |
$$ | . . . . . . . O X . . . . . X X X . . |
$$ | O O O O O O O O X X X X X X X , X . . |
$$ | . O . X X X X O X M M M M M X X X . . |
$$ | O O 4 X X X X O 1 M M M M M X . X . . |
$$ | . O X X X X X X 5 X X X X X X X X . . |
$$ ---------------------------------------[/go]


Black captures 10 stones and saves 29. White captures 20. If black had played :b1: at :w2:, white would have played :b1: sure in the knowledge that black could only save one of the remaining dangos.
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Offline jts
 Post subject: Re: Texas-sized tedomari
Post #5 Posted: Wed Jul 31, 2013 7:25 am 
Oza
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Charlie, one minor note:
Black saves 29 stones and two points, for an even 60 points (or thirty pairs, if you think that way). c3&4 could become W territory...
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