L19 Go Problem Championship: Round 17

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Kirby
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L19 Go Problem Championship: Round 17

Post by Kirby »

Welcome to Round 17 of the L19 Go Problem Championship.

All problems are black to play. As usual, provide your solutions either via hide tags, or direct private message to me.

Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------
$$ | . . . O X . .
$$ | . O . O X . .
$$ | . . O X X . .
$$ | O O X , . . .
$$ | X X X . . . .
$$ | . . . . . . .[/go]


Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------
$$ . . . . X X . O X . . . |
$$ . . X O X O . O X . . . |
$$ . . X X O . . O O X X . |
$$ . . , . O O O . X . . . |
$$ . . . X X X X X . X . . |
$$ . . . . . . . . . . . . |[/go]


Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------------
$$ . . . . . . . . . . . |
$$ . X X O . . . . O X . |
$$ . . X . O . . O . X . |
$$ . , X . O . . O . X . |
$$ . . . X X . O . X . . |
$$ . . . . . X X X . . . |
$$ . . . . . . . . . . . |[/go]


Have fun! :salute:
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EdLee
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Post by EdLee »

Symmetrical shape. :)
Click Here To Show Diagram Code
[go]$$B Bent 4. Locally, W dead
$$ ---------------
$$ | . 1 . O X . .
$$ | 3 O 2 O X . .
$$ | . 4 O X X . .
$$ | O O X , . . .
$$ | X X X . . . .
$$ | . . . . . . .[/go]
If all ko threats removed...
Click Here To Show Diagram Code
[go]$$Bm5 :w6: tenuki/pass
$$ ---------------
$$ | 1 X 4 O X . .
$$ | X O O O X . .
$$ | 3 O O X X . .
$$ | O O X , . . .
$$ | X X X . . . .
$$ | . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$Bm9 @ :b7:, W has no threats
$$ ---------------
$$ | 2 3 O O X . .
$$ | 1 O O O X . .
$$ | . O O X X . .
$$ | O O X , . . .
$$ | X X X . . . .
$$ | . . . . . . .[/go]
( "3 points": tricky for Bent 4, a confusing shape... )
If W never has time to fill in both throw-in spots, then W is dead.
However, if W manages to fill them in, W can still get Bent 4:
Click Here To Show Diagram Code
[go]$$B Interesting shape...
$$ ---------------
$$ | 2 1 . O X . .
$$ | 3 O . O X . .
$$ | . . O X X . .
$$ | O O X , . . .
$$ | X X X . . . .
$$ | . . . . . . .[/go]

Click Here To Show Diagram Code
[go]$$B
$$ -------------------------
$$ . . . 1 X X 2 O X 6 . . |
$$ . . X O X O . O X 4 . . |
$$ . . X X O . 3 O O X X . |
$$ . . , 7 O O O 5 X . . . |
$$ . . . X X X X X . X . . |
$$ . . . . . . . . . . . . |[/go]
Click Here To Show Diagram Code
[go]$$B (a),(b) miai kill
$$ -------------------------
$$ . . . 1 X X 3 O X . . . |
$$ . . X O X O a O X b . . |
$$ . . X X O . 2 O O X X . |
$$ . . , . O O O . X . . . |
$$ . . . X X X X X . X . . |
$$ . . . . . . . . . . . . |[/go]
:study:
Click Here To Show Diagram Code
[go]$$B
$$ -----------------------
$$ . . . . . . . . . . . |
$$ . X X O . 1 . . O X . |
$$ . . X . O . . O . X . |
$$ . , X . O . . O . X . |
$$ . . . X X . O . X . . |
$$ . . . . . X X X . . . |
$$ . . . . . . . . . . . |[/go]
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Shaddy
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Re: L19 Go Problem Championship: Round 17

Post by Shaddy »

Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------
$$ | . 1 . O X . .
$$ | 3 O 2 O X . .
$$ | . . O X X . .
$$ | O O X , . . .
$$ | X X X . . . .
$$ | . . . . . . .[/go]


Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------
$$ . . . 1 X X . O X . . . |
$$ . . X O X O 3 O X 2 . . |
$$ . . X X O . . O O X X . |
$$ . . , . O O O . X . . . |
$$ . . . X X X X X . X . . |
$$ . . . . . . . . . . . . |[/go]


Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------------
$$ . . . 0 9 6 7 . . . . |
$$ . X X O 2 1 8 . O X . |
$$ . . X . O 5 . O . X . |
$$ . , X . O 3 . O . X . |
$$ . . . X X 4 O . X . . |
$$ . . . . . X X X . . . |
$$ . . . . . . . . . . . |[/go]


Ko?
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Kirby
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Re: L19 Go Problem Championship: Round 17

Post by Kirby »

@EdLee:
Yes, on Problems 1 & 2. Good start on Problem 3.


@Shaddy:
Looks good for first two problems. Ko is the solution for #3, but maybe you can do a bit better if white responds at :w2:, as in your diagram?
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Monkey
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Re: L19 Go Problem Championship: Round 17

Post by Monkey »

Kirby wrote:Welcome to Round 17 of the L19 Go Problem Championship.

All problems are black to play. As usual, provide your solutions either via hide tags, or direct private message to me.

Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------
$$ | . 3 . O X . .
$$ | 1 O . O X . .
$$ | . 2 O X X . .
$$ | O O X , . . .
$$ | X X X . . . .
$$ | . . . . . . .[/go]


Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------
$$ . . . 1 X X 2 O X 8 . . |
$$ . . X O X O 6 O X 4 . . |
$$ . . X X O 9 3 O O X X . |
$$ . . , 7 O O O 5 X . . . |
$$ . . . X X X X X . X . . |
$$ . . . . . . . . . . . . |[/go]


Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------------
$$ . . . . . . . . . . . |
$$ . X X O . . . . O X . |
$$ . . X . O . . O . X . |
$$ . , X . O . . O . X . |
$$ . . . X X . O . X . . |
$$ . . . . . X X X . . . |
$$ . . . . . . . . . . . |[/go]


Have fun! :salute:


Edited: looks like you messed up your hide tags. I've added them, but feel free to re-edit this post. --Hyperpape
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hyperpape
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Re: L19 Go Problem Championship: Round 17

Post by hyperpape »

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

Bent four in the corner.


Problem 2
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------
$$ . . . 1 X X . O X 4 . . |
$$ . . X O X O 5 O X 2 3 . |
$$ . . X X O . . O O X X . |
$$ . . , . O O O . X . . . |
$$ . . . X X X X X . X . . |
$$ . . . . . . . . . . . . |[/go]
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Kirby
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Re: L19 Go Problem Championship: Round 17

Post by Kirby »

@Monkey:
Looks good for problems 1 and 2.
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Kirby
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Re: L19 Go Problem Championship: Round 17

Post by Kirby »

@hyperpape:
Problem 1 looks good.

For problem 2, do you have a response for this?

Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------
$$ . . . 1 X X 4 O X . . . |
$$ . . X O X O . O X 2 3 . |
$$ . . X X O . . O O X X . |
$$ . . , . O O O . X . . . |
$$ . . . X X X X X . X . . |
$$ . . . . . . . . . . . . |[/go]
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hyperpape
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Re: L19 Go Problem Championship: Round 17

Post by hyperpape »

Kirby wrote:@hyperpape:
Problem 1 looks good.

For problem 2, do you have a response for this?

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


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

b can't make an extra eye, meaning B shouldn't play there
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gamesorry
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Re: L19 Go Problem Championship: Round 17

Post by gamesorry »

1. Bent four in the corner
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------
$$ | . 1 . O X . .
$$ | 3 O 2 O X . .
$$ | . 4 O X X . .
$$ | O O X , . . .
$$ | X X X . . . .
$$ | . . . . . . .[/go]

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

3.
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------------
$$ . . b 9 0 7 8 . . . . |
$$ . X X O 4 1 2 . O X . |
$$ . . X c O 3 . O . X . |
$$ . , X a O 5 . O . X . |
$$ . . . X X 6 O . X . . |
$$ . . . . . X X X . . . |
$$ . . . . . . . . . . . |[/go]
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Re: L19 Go Problem Championship: Round 17

Post by Monkey »

Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------------
$$ . . . 8 . 7 . . . . . |
$$ . X X O 4 1 2 . O X . |
$$ . . X . O 3 . O . X . |
$$ . , X 9 O 5 . O . X . |
$$ . . . X X 6 O . X . . |
$$ . . . . . X X X . . . |
$$ . . . . . . . . . . . |[/go]
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hyperpape
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Re: L19 Go Problem Championship: Round 17

Post by hyperpape »

Problem 3
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------------
$$ . . . . 8 6 7 . . . . |
$$ . X X O 4 3 9 . O X . |
$$ . . X . O 5 . O . X . |
$$ . , X . O 1 . O . X . |
$$ . . . X X 2 O . X . . |
$$ . . . . . X X X . . . |
$$ . . . . . . . . . . . |[/go]


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


Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------------
$$ . . . . . . . . . . . |
$$ . X X O . . . . O X . |
$$ . . X . O 2 . O . X . |
$$ . , X . O 1 . O . X . |
$$ . . . X X . O . X . . |
$$ . . . . . X X X . . . |
$$ . . . . . . . . . . . |[/go]
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Kirby
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Re: L19 Go Problem Championship: Round 17

Post by Kirby »

I'm on vacation right now, and I'll be going to the US Go Congress after. So let's postpone this competition until mid-August.
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