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Offline cyclops
 Post subject: Maeda El 190 ..
Post #1 Posted: Sat Feb 19, 2011 6:13 am 
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Because nobody liked the previous ones here some others.
It is hidden because the left side shows the solutions of the previous problems.
As a sidetrack we can teach ourselves japanese by deciphering all the characters, like from Rosetta's stone.

Attachment:
maedaEl190.JPG
maedaEl190.JPG [ 90.7 KiB | Viewed 5100 times ]
Attachment:
maeda_instructions.JPG
maeda_instructions.JPG [ 122.25 KiB | Viewed 5100 times ]


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Offline Sverre
 Post subject: Re: Maeda El 190 ..
Post #2 Posted: Sun Feb 20, 2011 3:54 am 
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Click Here To Show Diagram Code
[go]$$ 190
$$|.......
$$|..O....
$$|...O.O.
$$|..OXX..
$$|..OX.O.
$$|.OXX...
$$|..OXOO.
$$|..OOX..
$$|.X.XX..
$$|..X....
$$|.......[/go]


Click Here To Show Diagram Code
[go]$$ 191
$$-------+
$$..O....|
$$.O.X...|
$$.OOOXX.|
$$....OX.|
$$..O.OO.|
$$.......|[/go]


Click Here To Show Diagram Code
[go]$$ 192
$$......|
$$..XXX.|
$$.X.OX.|
$$.XO.O.|
$$.XO.O.|
$$.XO...|
$$------+[/go]


I have no idea how to solve problem 190, as far as I can tell Black is dead.

Click Here To Show Diagram Code
[go]$$ 191
$$-------+
$$..O3.1.|
$$.O.X..2|
$$.OOOXX.|
$$....OX.|
$$..O.OO.|
$$.......|[/go]


Click Here To Show Diagram Code
[go]$$ 192
$$......|
$$..XXX.|
$$.X.OX.|
$$.XO5O1|
$$.XO.O2|
$$.XO43.|
$$------+[/go]
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Offline unkx80
 Post subject: Re: Maeda El 190 ..
Post #3 Posted: Sun Feb 20, 2011 5:55 am 
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Among these three problems, I found 190 the hardest because I initially focused in the wrong area.

Hints for 190:
There is no way out on the right side.

The solution is a ko.

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Offline Bill Spight
 Post subject: Re: Maeda El 190 ..
Post #4 Posted: Sun Feb 20, 2011 10:38 am 
Honinbo

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cyclops wrote:
Because nobody liked the previous ones here some others.
It is hidden because the left side shows the solutions of the previous problems.
As a sidetrack we can teach ourselves japanese by deciphering all the characters, like from Rosetta's stone.

Attachment:
maedaEl190.JPG
Attachment:
maeda_instructions.JPG


BTW, that should be around 10 kyu, not less than 10 kyu. :)

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Offline cyclops
 Post subject: Re: Maeda El 190 ..
Post #5 Posted: Mon Feb 21, 2011 3:06 am 
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Last call for problem 190. Come on, you guys. It is only 5 to 6 kyu. One long one way street. ( 11 moves )
Besides, it is very instructive. Never encountered such shape in your games before?
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Offline Sverre
 Post subject: Re: Maeda El 190 ..
Post #6 Posted: Mon Feb 21, 2011 3:31 am 
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cyclops wrote:
Last call for problem 190. Come on, you guys. It is only 5 to 6 kyu. One long one way street. ( 11 moves )
Besides, it is very instructive. Never encountered such shape in your games before?


Second try. I was spoiled by unkx's hint though.

Click Here To Show Diagram Code
[go]$$ 190
$$|.......
$$|..O....
$$|..6O.O.
$$|.5OXX..
$$|.3OX.O.
$$|.OXX...
$$|41OXOO.
$$|72OOX..
$$|8X.XX..
$$|..X....
$$|.......[/go]


Click Here To Show Diagram Code
[go]$$
$$|.......
$$|..O....
$$|.2OO.O.
$$|.XOXX..
$$|.XOX.O.
$$|.OXX...
$$|O.OXOO.
$$|3OOOX..
$$|OX.XX..
$$|1.X....
$$|.......[/go]
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Offline topazg
 Post subject: Re: Maeda El 190 ..
Post #7 Posted: Mon Feb 21, 2011 4:11 am 
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Here's my try for 190:

Click Here To Show Diagram Code
[go]$$ 190 - Starting setup
$$|.......
$$|..O....
$$|..6O.O.
$$|.5OXX..
$$|.3OX.O.
$$|.OXX...
$$|41OXOO.
$$|.2OOX..
$$|.X.XX..
$$|..X....
$$|.......[/go]


Click Here To Show Diagram Code
[go]$$ 190 :b7: @ :b3: - "a" stops White connecting after :b5:
$$|.......
$$|..O....
$$|.6OO.O.
$$|5XOXX..
$$|4XOX.O.
$$|3OXX...
$$|OCOXOO.
$$|2OOOX..
$$|1X.XX..
$$|..X....
$$|.......[/go]


This is a two step ko, with Black taking first?

EDIT: Maybe the other side?

Click Here To Show Diagram Code
[go]$$ 190 :b1: @ :w4:
$$|.......
$$|..O....
$$|.8OO.O.
$$|7XOXX..
$$|6XOX.O.
$$|5OXX...
$$|OCOXOO.
$$|4OOOX..
$$|2X.XX..
$$|3.X....
$$|.......[/go]


This is a direct ko if White plays :w4: @ :w8:, or in the sequence above where White connects, with :b9: capturing again at :b5:

Presumably White will fight the ko the first time though, and can play :w8: as a ko threat (because it's still a direct ko anyway)?

FURTHER EDIT: Actually, isn't this a two step ko again? Go is hard :(
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Offline unkx80
 Post subject: Re: Maeda El 190 ..
Post #8 Posted: Mon Feb 21, 2011 4:59 am 
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@Topagz:

L&D wise, I see no difference between your two diagrams. I regard both as solutions (although I won't play the second diagram myself because the throw-in is unnecessary).

I think both are two step ko (http://senseis.xmp.net/?TwoStepKo).

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