Life In 19x19 :: <problem> black to play and win

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[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]

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[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]

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[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]

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[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]

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[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]

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[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]

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[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]

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[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]

Author:	MJK [ Tue Aug 06, 2013 8:21 pm ]
Post subject:	<problem> black to play and win
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]

Author:	illluck [ Tue Aug 06, 2013 10:10 pm ]
Post subject:	Re: <problem> black to play and win
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]`

Author:	frankie99 [ Tue Aug 06, 2013 10:47 pm ]
Post subject:	Re: <problem> black to play and win
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]`

Author:	Bill Spight [ Tue Aug 06, 2013 10:53 pm ]
Post subject:	Re: <problem> black to play and win
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]` 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]` 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]` 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 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.

Author:	Boidhre [ Tue Aug 06, 2013 11:09 pm ]
Post subject:	Re: <problem> black to play and win
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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<problem> black to play and win http://prod.lifein19x19.com/viewtopic.php?f=15&t=8876	Page 1 of 1

Author:	Splatted [ Wed Aug 07, 2013 5:18 am ]
Post subject:	Re: <problem> black to play and win
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]`

Author:	MJK [ Wed Aug 07, 2013 11:06 am ]
Post subject:	Re: <problem> black to play and win
Maybe too easy for L19ers 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]`

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