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Texas-sized tedomari

https://lifein19x19.com/viewtopic.php?t=8836

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Texas-sized tedomari

Posted: Tue Jul 30, 2013 11:13 am
by yoyoma
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

Re: Texas-sized tedomari

Posted: Tue Jul 30, 2013 12:19 pm
by jts
But... but... who has the move?

Re: Texas-sized tedomari

Posted: Tue Jul 30, 2013 12:39 pm
by yoyoma
jts wrote:But... but... who has the move?
I edited the OP. Solve it for both cases. :)

Re: Texas-sized tedomari

Posted: Wed Jul 31, 2013 5:36 am
by Charlie
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.

Re: Texas-sized tedomari

Posted: Wed Jul 31, 2013 7:25 am
by jts
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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