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Offline cyclops
 Post subject: tsumego exploration #19
Post #1 Posted: Thu Nov 22, 2012 6:56 am 
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On Topasz' request I will open a new thread for every new series of problems.
#17 & #18 are in my previous thread. Sverre solved #18 while #17c is not killed yet unconditionally. ( there is no garantee it is possible, but about all were ) I give some additional time. ;-)
This threads tries to repeat the success of explo's tsumego problems at Godiscussions 5 years ago. I am just copying.


Last edited by cyclops on Thu Nov 22, 2012 5:29 pm, edited 3 times in total.
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Offline cyclops
 Post subject: Re: tsumego exploration #19
Post #2 Posted: Thu Nov 22, 2012 5:18 pm 
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Day #19 November 23th
Black to move. Conditional solutions are suspect.

Elementary problem

Click Here To Show Diagram Code
[go]$$Bc
$$----------
$$|.........
$$|.OOOOX.X.
$$|.OXXXX...
$$|.X.,.....
$$|..X......
$$|.........[/go]


Intermediate problem

Click Here To Show Diagram Code
[go]$$Bc
$$-------
$$|...OX.
$$|.OOOX.
$$|.OXXX.
$$|.OX,..
$$|.XX...
$$|......[/go]


Advanced problem

Click Here To Show Diagram Code
[go]$$Bc
$$----------
$$|.........
$$|XXXXOOOX.
$$|OOOOOX.X.
$$|.XXXXX...
$$|.........[/go]
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Offline topazg
 Post subject: Re: tsumego exploration #19
Post #3 Posted: Thu Nov 22, 2012 5:25 pm 
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Elementary problem

Click Here To Show Diagram Code
[go]$$Bc
$$----------
$$|.3.21....
$$|.OOOOX.X.
$$|.OXXXX...
$$|.X.,.....
$$|..X......
$$|.........[/go]


Intermediate problem

Click Here To Show Diagram Code
[go]$$Bc
$$-------
$$|.1.OX.
$$|3OOOX.
$$|.OXXX.
$$|2OX,..
$$|.XX...
$$|......[/go]


May come back to advanced one
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Offline cyclops
 Post subject: Re: tsumego exploration #19
Post #4 Posted: Thu Nov 22, 2012 5:42 pm 
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topazg wrote:
........

May come back to advanced one


Dans only get points for the advanced solutions. Don't forget #17c!
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Offline Josh Hatch
 Post subject: Re: tsumego exploration #19
Post #5 Posted: Thu Nov 22, 2012 6:54 pm 
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Advanced problem:
Click Here To Show Diagram Code
[go]$$Bc
$$----------
$$|.1.234...
$$|XXXXOOOX.
$$|OOOOOX5X.
$$|.XXXXX...
$$|.........[/go]

I don't see any stronger responses for white. Everything else seems to turn out the same.
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Offline logan
 Post subject: Re: tsumego exploration #19
Post #6 Posted: Thu Nov 22, 2012 7:08 pm 
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cyclops wrote:
topazg wrote:
........

May come back to advanced one


Dans only get points for the advanced solutions. Don't forget #17c!

I got points for that one, right? :D

Click Here To Show Diagram Code
[go]$$Bc
$$----------
$$|.5.43....
$$|2OOOOX.X.
$$|1OXXXX...
$$|.X.,.....
$$|..X......
$$|.........[/go]


Click Here To Show Diagram Code
[go]$$Bc
$$-------
$$|31.OX.
$$|.OOOX.
$$|.OXXX.
$$|2OX,..
$$|.XX...
$$|......[/go]




SIKE!

Click Here To Show Diagram Code
[go]$$Bc
$$-------
$$|.1.OX.
$$|3OOOX.
$$|.OXXX.
$$|2OX,..
$$|.XX...
$$|......[/go]


Click Here To Show Diagram Code
[go]$$Bc :w8: @ :b3:
$$----------
$$|.1.234.6.
$$|XXXXOOOX7
$$|OOOOOX5X.
$$|9XXXXX...
$$|.........[/go]
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Offline Sverre
 Post subject: Re: tsumego exploration #19
Post #7 Posted: Thu Nov 22, 2012 8:08 pm 
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cyclops wrote:
Day #19 November 23th
Black to move. Conditional solutions are suspect.


Elementary problem

White has a length-5 potential eyespace open at both ends. Two hanes in either order reduces him to a 3-space killable shape. The 1-2 point also kills, by bent 4.

Click Here To Show Diagram Code
[go]$$Bc
$$----------
$$|.5.43....
$$|2OOOOX.X.
$$|1OXXXX...
$$|.X.,.....
$$|..X......
$$|.........[/go]


Click Here To Show Diagram Code
[go]$$Bc
$$----------
$$|4.531....
$$|.OOOOX.X.
$$|2OXXXX...
$$|.X.,.....
$$|..X......
$$|.........[/go]


Click Here To Show Diagram Code
[go]$$Bc
$$----------
$$|315.4....
$$|.OOOOX.X.
$$|2OXXXX...
$$|.X.,.....
$$|..X......
$$|.........[/go]


Intermediate problem

White is threatening to split his eyespace and live. Starting at the 1-2 point is the only viable attack.

Click Here To Show Diagram Code
[go]$$Bc B1 anywhere else, W plays 1
$$-------
$$|.1.OX.
$$|3OOOX.
$$|.OXXX.
$$|2OX,..
$$|.XX...
$$|......[/go]


Advanced problem
If W captures B's 4 stones, he is alive no matter what, so this is necessarily a semeai problem. Black can't make a big eyeshape but even a small eye can force the opponent to spend approach moves.

Click Here To Show Diagram Code
[go]$$Bc 6@3
$$----------
$$|.1.234...
$$|XXXXOOOX.
$$|OOOOOX5X.
$$|7XXXXX...
$$|.........[/go]
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Offline cyclops
 Post subject: Re: tsumego exploration #19
Post #8 Posted: Fri Nov 23, 2012 7:50 am 
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cyclops wrote:
...... Don't forget #17c!

logan wrote:
I got points for that one, right? :D

cyclops wrote:
...... Conditional solutions are suspect.

You get one point with a question mark. ;-) to be shared with Topasz, Noname& Sverre
And an official warning because you spoiled my splendid "solution". ;-)
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