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Offline cyclops
 Post subject: tsumego #37
Post #1 Posted: Mon Dec 10, 2012 5:47 pm 
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Day #37 December 11th
5 yrs ago no solutions to the advanced problem were posted. Maybe because the issues with the previous series. So solve it this time on your own risk as in real life.
#37a Advanced problem
Click Here To Show Diagram Code
[go]$$BC
$$-----------
$$|.X........
$$|OOOOOX.X..
$$|OXXOXX....
$$|X.XXOO.XX,
$$|.XXOX.OO..
$$|...O......
$$|.O.O.O....
$$|..........[/go]

#37b Intermediate problem
Click Here To Show Diagram Code
[go]$$BC
$$-----------
$$|.....OX...
$$|OOO.OOX.X.
$$|.X...OX...
$$|.XXXXX...,
$$|..........[/go]

#37c Elementary problem
Click Here To Show Diagram Code
[go]$$BC
$$--------
$$|XO.OX..
$$|X.XXXO.
$$|..OOOO.
$$|OO.,...
$$|.......[/go]

edit: Hi MagicWand, you are welcome to take over. If you get more responses than this one I withdraw happily.
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Offline Josh Hatch
 Post subject: Re: tsumego #37
Post #2 Posted: Mon Dec 10, 2012 5:57 pm 
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The closest I can find for black is a direct ko.
#37a Advanced problem
Click Here To Show Diagram Code
[go]$$Bc
$$-----------
$$|.X753.....
$$|OOOOOX.X..
$$|OXXOXX....
$$|X.XXOO.XX,
$$|6XXOX.OO..
$$|21.O......
$$|4O.O.O....
$$|..........[/go]

#37b Intermediate problem
Click Here To Show Diagram Code
[go]$$Bc 7 at 1
$$-----------
$$|..436OX...
$$|OOO1OOX.X.
$$|.X52.OX...
$$|.XXXXX...,
$$|..........[/go]

Note: 5 to the right of 2 would fail because after 6 and the throw in at 7 white connects at 5
Click Here To Show Diagram Code
[go]$$Bc 7 at 1, 9 at 3, 10 to the right of 1
$$-----------
$$|..436OX...
$$|OOO1OOX.X.
$$|.X825OX...
$$|.XXXXX...,
$$|..........[/go]

#37c Elementary problem
Click Here To Show Diagram Code
[go]$$Bc
$$--------
$$|XO.OX..
$$|X1XXXO.
$$|..OOOO.
$$|OO.,...
$$|.......[/go]

This post by Josh Hatch was liked by: cyclops
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Offline pancake
 Post subject: Re: tsumego #37
Post #3 Posted: Fri Jan 11, 2013 7:52 am 
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This ko is better for black. If white takes the ko and black takes the two stones, white still has to connect. In the other ko, white connected, then black took 2 stones.

Click Here To Show Diagram Code
[go]$$BC
$$-----------
$$|.X.53.....
$$|OOOOOX.X..
$$|OXXOXX....
$$|X.XXOO7XX,
$$|6XXOX.OO..
$$|12.O......
$$|4O.O.O....
$$|..........[/go]
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Offline Prodigious
 Post subject: Re: tsumego #37
Post #4 Posted: Fri Jan 11, 2013 5:03 pm 
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Here's an unconditional solution

Click Here To Show Diagram Code
[go]$$BC
$$-----------
$$|.X..9.....
$$|OOOOOX.X..
$$|OXXOXX....
$$|X.XXOO.XX,
$$|.XXOX.OO..
$$|564O......
$$|7O1O.O....
$$|.32.......
$$|.8........[/go]

_________________
IN VICTORY, MALICE. IN DEFEAT, REVENGE. DON'T GET MAD, GET BAD

This post by Prodigious was liked by: cyclops
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Offline cyclops
 Post subject: Re: tsumego #37
Post #5 Posted: Sat Jan 12, 2013 6:12 pm 
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Prodigious wrote:
Here's an unconditional solution .........

Wow. you make me happy.
OC I tried to refute your solution but the next variant for :w2: fails.
Click Here To Show Diagram Code
[go]$$Bc a&b are miai for B after this sequence
$$ +---------------------
$$ | . X . . . . . . . .
$$ | O O O O O X . X . .
$$ | O X X O X X . . . .
$$ | X . X X O O . X X ,
$$ | . X X O B . O O . .
$$ | . 2 3 O . . . . . .
$$ | . O 1 O b O . . . .
$$ | . a 4 5 . . . . . .
$$ | . . . . . . . . . .[/go]

That is why the marked B stone is essential
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