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 Post subject: Ladder maker/breaker puzzle
Post #1 Posted: Wed Dec 23, 2020 4:40 pm 
Lives in gote

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Here's a puzzle in a similar shape as the last ladder position I posted. It is not anywhere close to the same level of complexity, it's much easier.

Black tries to play a ladder maker, White to respond. The correct move will break the ladder in a way that leaves Black with no good further options to re-threaten it.

Click Here To Show Diagram Code
[go]$$Bc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . X O . O . . |
$$ | . . . . . . . . . . . . X O X O O . . |
$$ | . . . O . . . . . , . . . O X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 1 . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . O O O . . . . , . . . . . X . . . |
$$ | . X X X O X . . . . . . . . . . . . . |
$$ | . O O O X . X . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


This post by lightvector was liked by: le_4TC
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 Post subject: Re: Ladder maker/breaker puzzle
Post #2 Posted: Wed Dec 23, 2020 7:03 pm 
Judan

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Just on the fact you made a post and I like empty triangles (I didn't even check the ladder):

Click Here To Show Diagram Code
[go]$$Bc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . X O . O . . |
$$ | . . . . . . . . . . . . X O X O O . . |
$$ | . . . O . . . . . , . . . O X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 1 . . . . . . . . . . . . . . . . . |
$$ | . . 2 . . . . . . . . . . . . . . . . |
$$ | . . O O O . . . . , . . . . . X . . . |
$$ | . X X X O X . . . . . . . . . . . . . |
$$ | . O O O X . X . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


This post by Uberdude was liked by: lightvector
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 Post subject: Re: Ladder maker/breaker puzzle
Post #3 Posted: Fri Dec 25, 2020 9:33 am 
Lives in gote

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@Uberdude :lol:

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 Post subject: Re: Ladder maker/breaker puzzle
Post #4 Posted: Fri Dec 25, 2020 1:47 pm 
Gosei
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I came to the same conclusion as Ubderdude, for almost the same reasons and with a bit of reading ;)

Click Here To Show Diagram Code
[go]$$Bc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . X O . O . . |
$$ | . . . . . . . . . . . . X O X O O . . |
$$ | . . . O . . . . . , . . . O X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 1 d e . . . . . . . . . . . . . . . |
$$ | . b c . . . . . . . . . . . . . . . . |
$$ | . a O O O . . . . , . . . . . X . . . |
$$ | . X X X O X . . . . . . . . . . . . . |
$$ | . O O O X . X . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


A and B answer the threat but don't break the ladder. E breaks the ladder but doesn't answer the threat. Only C and D do both.

Click Here To Show Diagram Code
[go]$$Bc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . X O . O . . |
$$ | . . . . . . . . . . . . X O X O O . . |
$$ | . . . O . . . . . , . . . O X X X . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 3 . . . . . . . . . . . . . . . . |
$$ | . 1 2 4 . . . . . . . . . . . . . . . |
$$ | 7 6 8 . . . . . . . . . . . . . . . . |
$$ | . 5 O O O . . . . , . . . . . X . . . |
$$ | . X X X O X . . . . . . . . . . . . . |
$$ | . O O O X . X . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


D gives this result. I don't see how Black can take advantage.

Click Here To Show Diagram Code
[go]$$Bc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . X O . O . . |
$$ | . . . . . . . . . . . . X O X O O . . |
$$ | . . . O . . . . . , . . . O X X X . . |
$$ | . . . . . . . . . . . . . 4 . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . 7 . . . . . . . . . . . . . . . . |
$$ | . 1 2 3 . . . . . . . . . . . . . . . |
$$ | . . 5 . . . . . . . . . . . . . . . . |
$$ | . 6 O O O . . . . , . . . . . X . . . |
$$ | . X X X O X . . . . . . . . . . . . . |
$$ | . O O O X . X . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Maybe this way?

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 Post subject: Re: Ladder maker/breaker puzzle
Post #5 Posted: Fri Dec 25, 2020 2:21 pm 
Lives in gote

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@Knotwilg, basically yeah, but for the variation you asked about:

Black magnifies once and then wedges:

Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . O . . . |
$$ | . . . . . . . . . . . . . X O . O . . |
$$ | . . . . . . . . . . . . X O X O O . . |
$$ | . . . O . . . . . , . . 4 O X X X . . |
$$ | . . . . . . . . . . . . . 3 . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . 1 2 . . . . . . . . . . . . . . . . |
$$ | . b 5 c . . . . . . . . . . . . . . . |
$$ | . a O O O . . . . , . . . . . X . . . |
$$ | . X X X O X . . . . . . . . . . . . . |
$$ | . O O O X . X . . . . . . . . . . . . |
$$ | . . . . . X . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Now 'a' and 'b' do not break the ladder. Only c breaks the ladder and defends, for the moment.

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


Now white is in trouble. Only 'a' keeps the corner, but it does not break the ladder.


This post by lightvector was liked by: Bill Spight
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