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Offline Kirby
 Post subject: L19 Go Problem Championship: Round 14
Post #1 Posted: Mon May 29, 2017 8:40 pm 
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Tygem: 커비라고해
Welcome to Round 14 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]$$Bc
$$ ------------------
$$ | . O . . . . X . .
$$ | X O O . . O X . .
$$ | O O X O O X X . .
$$ | . X X X X . . . .
$$ | . . . . . . . . .[/go]


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


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


Have fun! :salute:

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Offline EdLee
 Post subject:
Post #2 Posted: Mon May 29, 2017 8:52 pm 
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Click Here To Show Diagram Code
[go]$$B
$$ -------------------
$$ | . O . 1 2 3 X . .
$$ | X O O . . O X . .
$$ | O O X O O X X . .
$$ | . X X X X . . . .
$$ | . . . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$B
$$ -------------------
$$ | . O . 1 3 . X . .
$$ | X O O . 2 O X . .
$$ | O O X O O X X . .
$$ | . X X X X . . . .
$$ | . . . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$B
$$ -------------------
$$ | . O . 1 . 2 X . .
$$ | X O O . 3 O X . .
$$ | O O X O O X X . .
$$ | . X X X X . . . .
$$ | . . . . . . . . .[/go]
Click Here To Show Diagram Code
[go]$$B
$$ -------------------
$$ | . O . 1 . 3 X . .
$$ | X O O 2 . O X . .
$$ | O O X O O X X . .
$$ | . X X X X . . . .
$$ | . . . . . . . . .[/go]

:study:
Click Here To Show Diagram Code
[go]$$B
$$ ---------------------
$$ . . . X O O 1 . O . |
$$ . . O O X . . X . X |
$$ . . O X X X X O X . |
$$ , . O . . . , O X . |
$$ . . . . O O . O O . |
$$ . . . . . . . . . . |[/go]
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Offline Shaddy
 Post subject: Re: L19 Go Problem Championship: Round 14
Post #3 Posted: Tue May 30, 2017 8:25 am 
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Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ------------------
$$ | . O . 1 . . X . .
$$ | X O O . . O X . .
$$ | O O X O O X X . .
$$ | . X X X X . . . .
$$ | . . . . . . . . .[/go]


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


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

Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . . . . .
$$ | . . . O . . . . . . . . .
$$ | . . . . . . . 9 . . . . .
$$ | . . O O X X X 2 X X . . .
$$ | . O X X O O O 4 O 0 a . .
$$ | . O X O X X O O 3 b O c .
$$ | . . X O O X X 1 5 X d O e
$$ | O . X O X O . . . 6 X f .
$$ | . . . O 8 . . . . 7 . g .
$$ --------------------------[/go]

5 is a minor tesuji. 6 is pure magic.


Keep pulling problems from Fa Yang Lun, please :rambo:
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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 14
Post #4 Posted: Tue May 30, 2017 9:34 am 
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@EdLee:
Problem 1 is correct.

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 14
Post #5 Posted: Tue May 30, 2017 9:38 am 
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@Shaddy:
Problems 1 and 3 are correct. I agree that :w6: is amazing. I heard that Dosaku came up with this move.

For Problem 2, do you have a response to this?
Click Here To Show Diagram Code
[go]$$B
$$ ---------------------
$$ . . 2 C O O 1 . O . |
$$ . . O O X . . X . X |
$$ . . O X X X X O X . |
$$ , . O . . . , O X . |
$$ . . . . O O . O O . |
$$ . . . . . . . . . . |[/go]

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Offline Marcus
 Post subject: Re: L19 Go Problem Championship: Round 14
Post #6 Posted: Tue May 30, 2017 10:52 am 
Gosei

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Oh, hey, I wonder if I can still do these. Quick shot at it:

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


Problem 2:
Click Here To Show Diagram Code
[go]$$Bc Best I could come up with
$$ --------------------
$$ . . . X 7 C 1 5 O . |
$$ . . O O X 3 . X 4 X |
$$ . . O X X X X O C 6 |
$$ , . O . . . , O C 2 |
$$ . . . . O O . O O . |
$$ . . . . . . . . . . |[/go]



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


Click Here To Show Diagram Code
[go]$$Bcm11
$$ | . . . . . . . . . . . . .
$$ | . . . O . . . . . . . . .
$$ | . . . . . . . 7 . . . . .
$$ | . . O O X X X 4 X X . . .
$$ | . O X X O O O 6 O 8 9 . .
$$ | . O X O W W W W 1 0 O . .
$$ | . . X O W B B 2 5 X . O .
$$ | O . X O B . . 3 . . X . .
$$ | . . . B . . . . . . . . .
$$ --------------------------[/go]


Click Here To Show Diagram Code
[go]$$Bcm21
$$ | . . . . . . . . . . . . .
$$ | . . . O . . . . . . . . .
$$ | . . . . . . . B . . . . .
$$ | . . O O X X X W X X . . .
$$ | . O X X O O O W O W B . .
$$ | . O X O W W W W B W O 1 .
$$ | . . X O W B B W B X 2 O 3
$$ | O . X O B . . B . . X 4 5
$$ | . . . B . . . . . . . 6 7
$$ --------------------------[/go]
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Offline Shaddy
 Post subject: Re: L19 Go Problem Championship: Round 14
Post #7 Posted: Tue May 30, 2017 9:27 pm 
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Kirby wrote:
@Shaddy:
Problems 1 and 3 are correct. I agree that :w6: is amazing. I heard that Dosaku came up with this move.

For Problem 2, do you have a response to this?
Click Here To Show Diagram Code
[go]$$B
$$ ---------------------
$$ . . 2 C O O 1 . O . |
$$ . . O O X . . X . X |
$$ . . O X X X X O X . |
$$ , . O . . . , O X . |
$$ . . . . O O . O O . |
$$ . . . . . . . . . . |[/go]

Ugh, of course it should be the other atari first, then after w captures make an eye. It's ko.
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Offline gamesorry
 Post subject: Re: L19 Go Problem Championship: Round 14
Post #8 Posted: Sat Jun 03, 2017 12:29 pm 
Lives with ko

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Rank: 3d
KGS: 3d
DGS: 3d
OGS: 3d
1.
Click Here To Show Diagram Code
[go]$$Bc
$$ ------------------
$$ | . O . 1 3 . X . .
$$ | X O O . 2 O X . .
$$ | O O X O O X X . .
$$ | . X X X X . . . .
$$ | . . . . . . . . .[/go]

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

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

Variation: B fails
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------------
$$ . . . X O O . . O . |
$$ . . O O X . . X 1 X |
$$ . . O X X X X O X . |
$$ , . O . . . , O X 2 |
$$ . . . . O O . O O . |
$$ . . . . . . . . . . |[/go]

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

3.
B1 should be the only move, however I couldn't figure out a way to capture w so far:
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . . . . .
$$ | . . . O . . . . . . . . .
$$ | . . . . . . . . . . . . .
$$ | . . O O X X X . X X . . .
$$ | . O X X O O O 7 O . . . .
$$ | . O X O 6 4 8 9 e , O . .
$$ | . . X O 2 3 0 b d X . O .
$$ | O . X O 1 h a c f . X . .
$$ | . . . 5 . . . . g . . . .
$$ --------------------------[/go]

Variation:
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . . . . . .
$$ | . . . O . . . . . . . . .
$$ | . . . . . . . e . . . . .
$$ | . . O O X X X b X X . . .
$$ | . O X X O O O 7 O f g . .
$$ | . O X O 6 4 8 0 a h O i .
$$ | . . X O 2 3 9 c n X j O k
$$ | O . X O 1 . . . . . X l m
$$ | . . . 5 . . . . . . . . .
$$ --------------------------[/go]
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Offline Shaddy
 Post subject: Re: L19 Go Problem Championship: Round 14
Post #9 Posted: Sun Jun 04, 2017 5:58 am 
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Problem 3 is not to capture White, but to save the 5 black stones.
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Offline unkx80
 Post subject: Re: L19 Go Problem Championship: Round 14
Post #10 Posted: Mon Jun 05, 2017 6:14 am 
Lives with ko
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Rank: Dan player
Marcus wrote:
Click Here To Show Diagram Code
[go]$$Bcm11
$$ | . . . . . . . . . . . . .
$$ | . . . O . . . . . . . . .
$$ | . . . . . . . 7 . . . . .
$$ | . . O O X X X 4 X X . . .
$$ | . O X X O O O 6 O 8 9 . .
$$ | . O X O W W W W 1 0 O . .
$$ | . . X O W B B 2 5 X . O .
$$ | O . X O B . . 3 . . X . .
$$ | . . . B . . . . . . . . .
$$ --------------------------[/go]


Your ladder won't work if W12 is played at W14.

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 14
Post #11 Posted: Mon Jun 05, 2017 9:45 pm 
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@Marcus:
See unkx80's comment regarding problem 3. Regarding Problem 2:
Click Here To Show Diagram Code
[go]$$Bc Best I could come up with
$$ --------------------
$$ . . 2 C O O 1 . O . |
$$ . . O O X . . X . X |
$$ . . O X X X X O X . |
$$ , . O . . . , O X . |
$$ . . . . O O . O O . |
$$ . . . . . . . . . . |[/go]

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 14
Post #12 Posted: Mon Jun 05, 2017 9:46 pm 
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@gamesorry:
Correct on problems 1 and 2. I hope Shaddy's clarification on problem 3 helped.

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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 14
Post #13 Posted: Mon Jun 05, 2017 9:52 pm 
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Solutions and updated leader board are given below.

Problem 1


Problem 2


Problem 3


Leaderboard
  1. gamesorry - 157
  2. EdLee - 109
  3. dfan - 101
  4. Shaddy - 85
  5. Schachus - 77
  6. hyperpape - 39
  7. jeromie - 31
  8. mongus - 19
  9. Lanrose - 16
  10. ez4u - 9
  11. fractic - 6
  12. Marcus - 5

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