L19 Go Problem Championship: Round 14

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Kirby
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L19 Go Problem Championship: Round 14

Post by Kirby »

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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EdLee
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Post by EdLee »

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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Shaddy
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Re: L19 Go Problem Championship: Round 14

Post by Shaddy »

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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Kirby
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Re: L19 Go Problem Championship: Round 14

Post by Kirby »

@EdLee:
Problem 1 is correct.
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Kirby
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Re: L19 Go Problem Championship: Round 14

Post by Kirby »

@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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Marcus
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Re: L19 Go Problem Championship: Round 14

Post by Marcus »

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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Shaddy
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Re: L19 Go Problem Championship: Round 14

Post by Shaddy »

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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Re: L19 Go Problem Championship: Round 14

Post by gamesorry »

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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Re: L19 Go Problem Championship: Round 14

Post by Shaddy »

Problem 3 is not to capture White, but to save the 5 black stones.
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Re: L19 Go Problem Championship: Round 14

Post by unkx80 »

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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Kirby
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Re: L19 Go Problem Championship: Round 14

Post by Kirby »

@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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Kirby
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Re: L19 Go Problem Championship: Round 14

Post by Kirby »

@gamesorry:
Correct on problems 1 and 2. I hope Shaddy's clarification on problem 3 helped.
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Kirby
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Re: L19 Go Problem Championship: Round 14

Post by Kirby »

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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