L19 Go Problem Championship: Round 13

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Kirby
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L19 Go Problem Championship: Round 13

Post by Kirby »

Welcome to Round 13 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]$$Bc
$$ ------------
$$ | . . . . X .
$$ | O O X O X .
$$ | . O O O X .
$$ | . X . X X .
$$ | . X . . . .
$$ | . . . . . .[/go]
Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------------
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . . . O . X O . . |
$$ . X . . . . . X O . . |
$$ . . . . . O X X O . . |
$$ . . . . X O X O . . . |
$$ . . . . . X O O . . . |
$$ . . . . . X . . . . . |
$$ . . . . . . . . . . . |[/go]
Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X . . O . .
$$ | X X . , X O . .
$$ | . . O . . O . .
$$ | X . . X . . O .
$$ | . . . . . O . .
$$ -----------------[/go]
Have fun! :salute:
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EdLee
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Post by EdLee »

Click Here To Show Diagram Code
[go]$$B (a), (b) miai kill
$$ -------------
$$ | . a 1 b X .
$$ | O O X O X .
$$ | . O O O X .
$$ | . X . X X .
$$ | . X . . . .
$$ | . . . X . .
$$ | . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$B
$$ -----------------------
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . 0 7 5 O . X O . |
$$ . , X 8 6 4 1 , X O . |
$$ . . . 9 3 2 O X X O . |
$$ . . . . . X O X O . . |
$$ . . . . . . X O O . . |
$$ . . . . . . X . . . . |
$$ . . . . . . . . . . . |[/go]
Click Here To Show Diagram Code
[go]$$Bm11
$$ -----------------------
$$ . 7 6 9 . . . . . . . |
$$ . 5 4 1 . . . . . . . |
$$ . 3 2 O X X O . X O . |
$$ . , X O O O X 8 X O . |
$$ . . . X X O O X X O . |
$$ . . . . . X O X O . . |
$$ . . . . . . X O O . . |
$$ . . . . . . X . . . . |
$$ . . . . . . . . . . . |[/go]
Click Here To Show Diagram Code
[go]$$Wm20
$$ -----------------------
$$ . X O X . . . . . . . |
$$ . X O X . . 2 . . . . |
$$ . X O O X X O . X O . |
$$ . , X O O O 1 O X O . |
$$ . . . X X O O X X O . |
$$ . . . . . X O X O . . |
$$ . . . . . . X O O . . |
$$ . . . . . . X . . . . |
$$ . . . . . . . . . . . |[/go]
If W captures :b1: any time instead of { :w6: .. :w16: },
then B simply squeezes.
:study:
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X . . O . .
$$ | X X . , X O . .
$$ | . . O . . O . .
$$ | X . . X . . O .
$$ | . . . . . O . .
$$ -----------------[/go]
:study:
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X . . O . .
$$ | X X 3 , X O . .
$$ | . 2 O . . O . .
$$ | X . 1 X . . O .
$$ | . . . . . O . .
$$ -----------------[/go]
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Kirby
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Re: L19 Go Problem Championship: Round 13

Post by Kirby »

@EdLee:
You are correct.
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hyperpape
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Re: L19 Go Problem Championship: Round 13

Post by hyperpape »

Problem 1
Click Here To Show Diagram Code
[go]$$Bc
$$ ------------
$$ | . 3 1 2 X .
$$ | O O X O X .
$$ | . O O O X .
$$ | . X . X X .
$$ | . X . . . .
$$ | . . . . . .[/go]
Problem 2
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------------
$$ . . . . . . . . . . . |
$$ . . . . . c . . . . . |
$$ . . b 7 5 O . X O . . |
$$ . X 8 6 4 1 a X O . . |
$$ . . 9 3 2 O X X O . . |
$$ . . . . X O X O . . . |
$$ . . . . . X O O . . . |
$$ . . . . . X . . . . . |
$$ . . . . . . . . . . . |[/go]
If white ever captures at a to try and escape the ladder, black plays at b (or whatever the remaining liberty is), White fills at :b1: and then c captures.
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jeromie
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Re: L19 Go Problem Championship: Round 13

Post by jeromie »

Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ------------
$$ | . 3 1 2 X .
$$ | O O X O X .
$$ | . O O O X .
$$ | . X . X X .
$$ | . X . . . .
$$ | . . . . . .[/go]
Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$Bc W8 at 1
$$ ----------------------
$$ . . . . . . . . . . . |
$$ . . . . . 9 . . . . . |
$$ . . . . 5 O . X O . . |
$$ . X . 7 4 1 6 X O . . |
$$ . . . 3 2 O X X O . . |
$$ . . . . X O X O . . . |
$$ . . . . . X O O . . . |
$$ . . . . . X . . . . . |
$$ . . . . . . . . . . . |[/go]
If white tries to escape black has the ladder and it reverts to the same squeeze above once it gets to the edge.:
Click Here To Show Diagram Code
[go]$$Bc W8 at 1
$$ ----------------------
$$ . . . . . . . . . . . |
$$ . . . . . . . . . . . |
$$ . . . 7 5 O . X O . . |
$$ . X 8 6 4 1 . X O . . |
$$ . . 9 3 2 O X X O . . |
$$ . . . . X O X O . . . |
$$ . . . . . X O O . . . |
$$ . . . . . X . . . . . |
$$ . . . . . . . . . . . |[/go]
As usual, problem 3 requires more thinking time. :-)
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Kirby
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Re: L19 Go Problem Championship: Round 13

Post by Kirby »

@hyperpape:
Spot on.
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Kirby
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Re: L19 Go Problem Championship: Round 13

Post by Kirby »

@jeromie:
You've got it.
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Shaddy
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Re: L19 Go Problem Championship: Round 13

Post by Shaddy »

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

Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X . . O . .
$$ | X X 1 4 X O . .
$$ | . 5 O 2 3 O . .
$$ | X . 6 X . . O .
$$ | . 7 . . . O . .
$$ -----------------[/go]
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Kirby
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Re: L19 Go Problem Championship: Round 13

Post by Kirby »

@Shaddy
Yep. There are other variations for problem 3, but that's probably the most interesting one.
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Shaddy
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Re: L19 Go Problem Championship: Round 13

Post by Shaddy »

Actually, I think I was wrong. Ko?
Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X 9 0 O . .
$$ | X X 1 8 X O . .
$$ | . . O 2 3 O . .
$$ | X . 4 X 5 . O .
$$ | . b a 6 7 O . .
$$ -----------------[/go]
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Kirby
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Re: L19 Go Problem Championship: Round 13

Post by Kirby »

@Shaddy:
Is :b7: necessary?
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Shaddy
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Re: L19 Go Problem Championship: Round 13

Post by Shaddy »

Kirby wrote:@Shaddy:
Is :b7: necessary?
Hm, 7 at b is ok.
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Kirby
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Re: L19 Go Problem Championship: Round 13

Post by Kirby »

I should clarify for Problem 3: You don't need to save all the stones, necessarily. You just need to live.
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gamesorry
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Re: L19 Go Problem Championship: Round 13

Post by gamesorry »

1. After :b1:, a and b miai
Click Here To Show Diagram Code
[go]$$Bc
$$ ------------
$$ | . b 1 a X .
$$ | O O X O X .
$$ | . O O O X .
$$ | . X . X X .
$$ | . X . . . .
$$ | . . . . . .[/go]
2. Ladder
Click Here To Show Diagram Code
[go]$$Bc, j = 1
$$ ----------------------
$$ g f i . . . . . . . . |
$$ e d a . . k . . . . . |
$$ c b 0 7 5 O . X O . . |
$$ . X 8 6 4 1 h X O . . |
$$ . . 9 3 2 O X X O . . |
$$ . . . . X O X O . . . |
$$ . . . . . X O O . . . |
$$ . . . . . X . . . . . |
$$ . . . . . . . . . . . |[/go]
3. Intuitions:
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X . . O . .
$$ | X X e , X O . .
$$ | . a O f . O . .
$$ | X c d X . . O .
$$ | . b . . . O . .
$$ -----------------[/go]
a: B fails
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X . . O . .
$$ | X X 5 , X O . .
$$ | . 1 O 6 7 O . .
$$ | X 4 2 X 8 . O .
$$ | . 3 . 9 0 O . .
$$ -----------------[/go]
b: B fails
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X 7 . O . .
$$ | X X 3 6 X O . .
$$ | 8 2 O 4 5 O . .
$$ | X . . X . . O .
$$ | . 1 . . . O . .
$$ -----------------[/go]
c: B fails
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X 9 0 O . .
$$ | X X 5 8 X O . .
$$ | . 4 O 6 7 O . .
$$ | X 1 2 X . . O .
$$ | . 3 . . . O . .
$$ -----------------[/go]
d: B fails
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X . . O . .
$$ | X X 3 6 X O . .
$$ | . 2 O 4 5 O . .
$$ | X 7 1 X 8 . O .
$$ | . . . . . O . .
$$ -----------------[/go]
e:
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X a b O . .
$$ | X X 1 0 X O . .
$$ | . c O 2 3 O . .
$$ | X 9 4 X 5 . O .
$$ | . 7 . 6 8 O . .
$$ -----------------[/go]
Variation:
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X . . O . .
$$ | X X 1 , X O . .
$$ | . 7 O 3 . O . .
$$ | X . 2 X . . O .
$$ | . 5 6 4 . O . .
$$ -----------------[/go]
f: B fails
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . O . O . . . .
$$ | . . O X O . . .
$$ | O O X 6 . O . .
$$ | X X 2 , X O . .
$$ | 5 4 O 1 . O . .
$$ | X 3 . X . . O .
$$ | . . . . . O . .
$$ -----------------[/go]
Looks like e is the solution
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EdLee
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Post by EdLee »

Hi Kirby,

Nice of you to clarify.
( Though it seems to be a standard, implied condition in all Go problems I've seen.
E.g. Round 12, problem 2: B needs not save :b1: :). )
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