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 Post subject: L19 Go Problem Championship: Round 13
Post #1 Posted: Sun May 14, 2017 10:55 pm 
Judan

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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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Post #2 Posted: Mon May 15, 2017 2:24 am 
Judan
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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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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #3 Posted: Mon May 15, 2017 9:29 am 
Judan

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@EdLee:
You are correct.

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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #4 Posted: Mon May 15, 2017 10:10 am 
Tengen

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OGS: Hyperpape 4k
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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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #5 Posted: Mon May 15, 2017 10:16 am 
Lives in sente

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Rank: KGS 3k
Universal go server handle: 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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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #6 Posted: Mon May 15, 2017 10:29 am 
Judan

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@hyperpape:
Spot on.

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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #7 Posted: Mon May 15, 2017 10:29 am 
Judan

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@jeromie:
You've got it.

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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #8 Posted: Tue May 16, 2017 1:16 pm 
Lives in sente
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Rank: KGS 5d
KGS: Str1fe, Midorisuke
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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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #9 Posted: Tue May 16, 2017 1:51 pm 
Judan

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@Shaddy
Yep. There are other variations for problem 3, but that's probably the most interesting one.

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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #10 Posted: Tue May 16, 2017 5:55 pm 
Lives in sente
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KGS: Str1fe, Midorisuke
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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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #11 Posted: Tue May 16, 2017 9:07 pm 
Judan

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@Shaddy:
Is :b7: necessary?

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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #12 Posted: Tue May 16, 2017 9:25 pm 
Lives in sente
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Kirby wrote:
@Shaddy:
Is :b7: necessary?

Hm, 7 at b is ok.

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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #13 Posted: Tue May 16, 2017 9:47 pm 
Judan

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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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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #14 Posted: Tue May 16, 2017 11:40 pm 
Lives with ko

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DGS: 3d
OGS: 3d
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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Post #15 Posted: Wed May 17, 2017 2:12 am 
Judan
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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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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #16 Posted: Sun May 21, 2017 10:35 pm 
Judan

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Round 13 will be extended by one week. Please feel free to submit solutions until then.

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 Post subject: Re: L19 Go Problem Championship: Round 13
Post #17 Posted: Mon May 29, 2017 8:38 pm 
Judan

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Solutions and updated leader board are given below.

Problem 1


Problem 2


Problem 3


Leaderboard
  1. gamesorry - 147
  2. EdLee - 105
  3. dfan - 97
  4. Schachus - 77
  5. Shaddy - 67
  6. hyperpape - 39
  7. jeromie - 31
  8. mongus - 19
  9. Lanrose - 16
  10. ez4u - 9
  11. fractic - 6

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