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Offline Kirby
 Post subject: L19 Go Problem Championship: Round 17
Post #1 Posted: Mon Jun 26, 2017 8:29 pm 
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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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Offline EdLee
 Post subject:
Post #2 Posted: Mon Jun 26, 2017 9:05 pm 
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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 . . . |
$$ . . . . . . . . . . . |[/go]
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Offline Shaddy
 Post subject: Re: L19 Go Problem Championship: Round 17
Post #3 Posted: Tue Jun 27, 2017 7:31 am 
Lives in sente
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Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$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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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 17
Post #4 Posted: Tue Jun 27, 2017 11:08 am 
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@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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Offline Monkey
 Post subject: Re: L19 Go Problem Championship: Round 17
Post #5 Posted: Fri Jun 30, 2017 3:33 pm 
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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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Offline hyperpape
 Post subject: Re: L19 Go Problem Championship: Round 17
Post #6 Posted: Fri Jun 30, 2017 3:47 pm 
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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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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 17
Post #7 Posted: Fri Jun 30, 2017 5:21 pm 
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@Monkey:
Looks good for problems 1 and 2.

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 17
Post #8 Posted: Fri Jun 30, 2017 5:24 pm 
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@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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Offline hyperpape
 Post subject: Re: L19 Go Problem Championship: Round 17
Post #9 Posted: Sat Jul 01, 2017 10:47 am 
Tengen

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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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Offline gamesorry
 Post subject: Re: L19 Go Problem Championship: Round 17
Post #10 Posted: Sun Jul 02, 2017 1:15 pm 
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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 . . . |
$$ . . . . . . . . . . . |[/go]
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Offline Monkey
 Post subject: Re: L19 Go Problem Championship: Round 17
Post #11 Posted: Tue Jul 04, 2017 9:07 am 
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Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$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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Offline hyperpape
 Post subject: Re: L19 Go Problem Championship: Round 17
Post #12 Posted: Tue Jul 04, 2017 12:44 pm 
Tengen

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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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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 17
Post #13 Posted: Thu Jul 06, 2017 11:09 pm 
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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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