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Offline topazg
 Post subject: Re: tsumego #18
Post #21 Posted: Wed Nov 21, 2012 6:58 pm 
Tengen
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EDIT: Cyclops, it'd be great to have a new thread for each one - I nearly missed this one :)

Elementary problem

Click Here To Show Diagram Code
[go]$$Bc
$$---------
$$|....OX..
$$|1OOOOX..
$$|OXOXX.X.
$$|.XX,....
$$|.X.X....
$$|........[/go]


Intermediate problem
Click Here To Show Diagram Code
[go]$$Bc
$$---------
$$|1...X...
$$|.OOOOXX.
$$|.OXXX...
$$|.OX,....
$$|.XX.....
$$|........
$$|.X......
$$|........[/go]


Advanced problem
Click Here To Show Diagram Code
[go]$$Bc
$$--------
$$|...X.X..
$$|3XOXXXO.
$$|.21OOOO.
$$|.O.O....
$$|........[/go]


Advanced problem
Click Here To Show Diagram Code
[go]$$Bc
$$--------
$$|.4.X.X..
$$|2XOXXXO.
$$|531OOOO.
$$|.O.O....
$$|........[/go]
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Offline Sverre
 Post subject: Re: tsumego #18
Post #22 Posted: Wed Nov 21, 2012 7:16 pm 
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cyclops wrote:
Day #18
November 22th --- Black to move --- ( as always )


Score so far: 1/3

Elementary problem

W has a length-4 eyespace with a weakness at 'a'.

Click Here To Show Diagram Code
[go]$$Bc
$$---------
$$|....OX..
$$|aOOOOX..
$$|OXOXX.X.
$$|.XX,....
$$|.X.X....
$$|........[/go]


Click Here To Show Diagram Code
[go]$$Bc Starting at a works (2 and 3 are miai)
$$---------
$$|2.3.OX..
$$|1OOOOX..
$$|OXOXX.X.
$$|.XX,....
$$|.X.X....
$$|........[/go]


Click Here To Show Diagram Code
[go]$$Bc Starting at the "1-2" point of the shape also works (2,3 miai).
$$---------
$$|.31.OX..
$$|2OOOOX..
$$|OXOXX.X.
$$|.XX,....
$$|.X.X....
$$|........[/go]


Intermediate problem
The eyeshape looks much like in the previous intermediate problem, except sente has been switched. Almost every move kills unconditionally, but I prefer the hanes since the result is not a bent 4.

Click Here To Show Diagram Code
[go]$$Bc a,b,c,d,e kill
$$---------
$$|cd.eX...
$$|bOOOOXX.
$$|.OXXX...
$$|aOX,....
$$|.XX.....
$$|........
$$|.X......
$$|........[/go]


Click Here To Show Diagram Code
[go]$$Bc
$$---------
$$|53.2X...
$$|.OOOOXX.
$$|4OXXX...
$$|1OX,....
$$|.XX.....
$$|........
$$|.X......
$$|........[/go]


Advanced problem
Black needs to get 'a' and 'b', without giving White time to cut. Taking or threatening to take the vulnerable stone seems like a natural way to gain tempo

Click Here To Show Diagram Code
[go]$$Bc
$$--------
$$|.a.X.X..
$$|bXWXXXO.
$$|...OOOO.
$$|.O.O....
$$|........[/go]


Click Here To Show Diagram Code
[go]$$Bc
$$--------
$$|.5.X.X..
$$|3XOXXXO.
$$|.21OOOO.
$$|.O4O....
$$|........[/go]


Click Here To Show Diagram Code
[go]$$Bc
$$--------
$$|.5.X.X..
$$|2XOXXXO.
$$|431OOOO.
$$|.O.O....
$$|........[/go]
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Offline logan
 Post subject: Re: tsumego (thx to explo)
Post #23 Posted: Wed Nov 21, 2012 7:50 pm 
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17C
Click Here To Show Diagram Code
[go]$$B
$$ ------------
$$|.O..O.1......
$$|XOOO...O2.X..
$$|.XXX..OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]

I couldn't figure out what to do after this, so I didn't post this answer.
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Offline Sverre
 Post subject: Re: tsumego (thx to explo)
Post #24 Posted: Wed Nov 21, 2012 7:55 pm 
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logan wrote:
17C
Click Here To Show Diagram Code
[go]$$B
$$ ------------
$$|.O..O.1......
$$|XOOO...O2.X..
$$|.XXX..OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]

I couldn't figure out what to do after this, so I didn't post this answer.



My attempt:

Click Here To Show Diagram Code
[go]$$B a and b are miai
$$ ------------
$$|.O.aOb1......
$$|XOOO34.O2.X..
$$|.XXX5.OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]
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Offline logan
 Post subject: Re: tsumego (thx to explo)
Post #25 Posted: Wed Nov 21, 2012 7:59 pm 
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Sverre wrote:
logan wrote:
17C
Click Here To Show Diagram Code
[go]$$B
$$ ------------
$$|.O..O.1......
$$|XOOO...O2.X..
$$|.XXX..OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]

I couldn't figure out what to do after this, so I didn't post this answer.



My attempt:

Click Here To Show Diagram Code
[go]$$B a and b are miai
$$ ------------
$$|.O.aOb1......
$$|XOOO34.O2.X..
$$|.XXX5.OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]

Nope:
Click Here To Show Diagram Code
[go]$$B
$$ ------------
$$|.O.6O71..80..
$$|XOOO34.O29X..
$$|.XXX5.OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]


Click Here To Show Diagram Code
[go]$$Bm11
$$ ------------
$$|.O.OOXX2.OO1.
$$|XOOOXO.OOXX..
$$|.XXXX.OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]

Ko was the best I could do the other day.

Click Here To Show Diagram Code
[go]$$B
$$ ------------
$$|.O..O.1.3....
$$|XOOO...O2.X..
$$|.XXX..OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]

And this tesuji had the most potential, but couldn't find anything with it.
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Offline Sverre
 Post subject: Re: tsumego (thx to explo)
Post #26 Posted: Wed Nov 21, 2012 8:06 pm 
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logan wrote:
Nope:
Click Here To Show Diagram Code
[go]$$B a and b are miai
$$ ------------
$$|.O.6O71..80..
$$|XOOO34.O29X..
$$|.XXX5.OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]


Click Here To Show Diagram Code
[go]$$Bm11 a and b are miai
$$ ------------
$$|.O.OOXX2.OO1.
$$|XOOOXO.OOXX..
$$|.XXXX.OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]

Ko was the best I could do the other day.


Click Here To Show Diagram Code
[go]$$Bm11 a and b are miai
$$ ------------
$$|.O.OOXX23451.
$$|XOOOXO.OOXX..
$$|.XXXX.OOXX.X.
$$|XO.XXXO..,...
$$|.O.XOOXX.X...
$$|XXXX.........
$$|....O.O......
$$|.O.O.........
$$|.............[/go]


B has bigger eyeshape and more liberties. White must win the ko what, 8+ times? Black can recoup the cost of the group by simply playing big gote moves, and unless White has many, many huge threats he can even win the ko afterwards for good measure.
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Offline logan
 Post subject: Re: tsumego (thx to explo)
Post #27 Posted: Wed Nov 21, 2012 9:02 pm 
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Well a ko is a ko :)

So it appears that the solution is incorrect.
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