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Offline MJK
 Post subject: <problem> black to play and win
Post #1 Posted: Tue Aug 06, 2013 8:21 pm 
Dies with sente

Posts: 94
Location: Amsterdam, NL
Liked others: 29
Was liked: 63
Click Here To Show Diagram Code
[go]$$c This is a label for the diagram.
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O . |
$$ | O O O O . |
$$ | . . . X . |
$$ ------------[/go]


Enjoy! :) and please hide your solutions.

[edit] Japanese rules, no komi, no prisoners [/edit]

_________________
Wait, please.

This post by MJK was liked by 5 people: daal, Dusk Eagle, emeraldemon, ez4u, graemy
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Offline illluck
 Post subject: Re: <problem> black to play and win
Post #2 Posted: Tue Aug 06, 2013 10:10 pm 
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As below?

Click Here To Show Diagram Code
[go]$$c This is a label for the diagram.
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O . |
$$ | O O O O 3 |
$$ | . 1 2 X . |
$$ ------------[/go]



Click Here To Show Diagram Code
[go]$$c This is a label for the diagram.
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O 2 |
$$ | O O O O b |
$$ | . 1 3 X a |
$$ ------------[/go]

This post by illluck was liked by: MJK
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Offline frankie99
 Post subject: Re: <problem> black to play and win
Post #3 Posted: Tue Aug 06, 2013 10:47 pm 
Beginner

Posts: 8
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Rank: weak
Click Here To Show Diagram Code
[go]$$c Seki.
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O 2 |
$$ | O O O O . |
$$ | . 1 3 X . |
$$ ------------[/go]

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Offline Bill Spight
 Post subject: Re: <problem> black to play and win
Post #4 Posted: Tue Aug 06, 2013 10:53 pm 
Honinbo

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Click Here To Show Diagram Code
[go]$$c Black to play and win
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O . |
$$ | O O O O . |
$$ | . 1 . X . |
$$ ------------[/go]


:b1: prevents a second eye.

Click Here To Show Diagram Code
[go]$$c Black to play and win
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O . |
$$ | O O O O . |
$$ | . 1 2 X . |
$$ ------------[/go]


:w2: prevents seki.

Click Here To Show Diagram Code
[go]$$c Black to play and win
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O 5 |
$$ | O O O O 3 |
$$ | . 1 2 X 4 |
$$ ------------[/go]


:w4: cannot be at 5 because of damezumari.

Variations:

Click Here To Show Diagram Code
[go]$$c Black to play and win
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O 2 |
$$ | O O O O 5 |
$$ | . 1 3 X 4 |
$$ ------------[/go]


After :b5: takes the ko, White has no threat.

So the bottom will remain seki.

Click Here To Show Diagram Code
[go]$$c Black to play and win
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O 5 |
$$ | O O O O 3 |
$$ | . 2 1 X 4 |
$$ ------------[/go]


Click Here To Show Diagram Code
[go]$$c Black to play and win
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O X |
$$ | O O O O X |
$$ | . O . 6 O |
$$ ------------[/go]


White wins by 1 pt.

Click Here To Show Diagram Code
[go]$$c Black to play and win
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O . |
$$ | O O O O 3 |
$$ | . 2 1 X 4 |
$$ ------------[/go]


Click Here To Show Diagram Code
[go]$$c Black to play and win
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O 6 |
$$ | O O O O X |
$$ | . O . 5 O |
$$ ------------[/go]


White wins.

_________________
The Adkins Principle:
At some point, doesn't thinking have to go on?
— Winona Adkins

Visualize whirled peas.

Everything with love. Stay safe.

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Offline Boidhre
 Post subject: Re: <problem> black to play and win
Post #5 Posted: Tue Aug 06, 2013 11:09 pm 
Oza

Posts: 2356
Location: Ireland
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Universal go server handle: Boidhre
Maybe

Click Here To Show Diagram Code
[go]$$c This is a label for the diagram.
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O . |
$$ | O O O O . |
$$ | . . 1 X . |
$$ ------------[/go]


Click Here To Show Diagram Code
[go]$$c Seki or a ko White can't win:
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O 2 |
$$ | O O O O . |
$$ | . 3 1 X . |
$$ ------------[/go]


Click Here To Show Diagram Code
[go]$$c Left with a dead three space eyespace
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O . |
$$ | O O O O . |
$$ | . 3 1 X 2 |
$$ ------------[/go]


Click Here To Show Diagram Code
[go]$$c However
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O . |
$$ | O O O O 3 |
$$ | . 2 1 X 4 |
$$ ------------[/go]


Click Here To Show Diagram Code
[go]$$c This is a label for the diagram.
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O 2 |
$$ | O O O O X |
$$ | . O . 1 O |
$$ ------------[/go]




So...




Click Here To Show Diagram Code
[go]$$c This seems to work for all the above yet lack the problem of the last diagram.
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O . |
$$ | O O O O . |
$$ | . 1 . X . |
$$ ------------[/go]



Click Here To Show Diagram Code
[go]$$c This is a label for the diagram.
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O 3 |
$$ | O O O O . |
$$ | . 1 . X 2 |
$$ ------------[/go]


Etc. It seems to come down to a miai between a dead eye shape for white or a false eye on the right. White doesn't seem to be able to avoid both without accepting a seki.

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Offline Splatted
 Post subject: Re: <problem> black to play and win
Post #6 Posted: Wed Aug 07, 2013 5:18 am 
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Universal go server handle: Splatted
Click Here To Show Diagram Code
[go]$$c This is a label for the diagram.
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O 5 |
$$ | O O O O 3 |
$$ | . 1 2 C 4 |
$$ ------------[/go]

This post by Splatted was liked by: MJK
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Offline MJK
 Post subject: Re: <problem> black to play and win
Post #7 Posted: Wed Aug 07, 2013 11:06 am 
Dies with sente

Posts: 94
Location: Amsterdam, NL
Liked others: 29
Was liked: 63
:clap:

Maybe too easy for L19ers :blackeye:

Below was the most interesting variation imo.

Click Here To Show Diagram Code
[go]$$
$$ ------------
$$ | O X . X . |
$$ | O X X X X |
$$ | O X O O . |
$$ | O O O O . |
$$ | . 1 . X 2 |
$$ ------------[/go]

_________________
Wait, please.

This post by MJK was liked by 2 people: Bill Spight, RBerenguel
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