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L19 Go Problem Championship: Round 14

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L19 Go Problem Championship: Round 14

Posted: Mon May 29, 2017 8:40 pm
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:

Posted: Mon May 29, 2017 8:52 pm
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]

Re: L19 Go Problem Championship: Round 14

Posted: Tue May 30, 2017 8:25 am
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:

Re: L19 Go Problem Championship: Round 14

Posted: Tue May 30, 2017 9:34 am
by Kirby
@EdLee:
Problem 1 is correct.

Re: L19 Go Problem Championship: Round 14

Posted: Tue May 30, 2017 9:38 am
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]

Re: L19 Go Problem Championship: Round 14

Posted: Tue May 30, 2017 10:52 am
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]

Re: L19 Go Problem Championship: Round 14

Posted: Tue May 30, 2017 9:27 pm
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.

Re: L19 Go Problem Championship: Round 14

Posted: Sat Jun 03, 2017 12:29 pm
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]

Re: L19 Go Problem Championship: Round 14

Posted: Sun Jun 04, 2017 5:58 am
by Shaddy
Problem 3 is not to capture White, but to save the 5 black stones.

Re: L19 Go Problem Championship: Round 14

Posted: Mon Jun 05, 2017 6:14 am
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.

Re: L19 Go Problem Championship: Round 14

Posted: Mon Jun 05, 2017 9:45 pm
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]

Re: L19 Go Problem Championship: Round 14

Posted: Mon Jun 05, 2017 9:46 pm
by Kirby
@gamesorry:
Correct on problems 1 and 2. I hope Shaddy's clarification on problem 3 helped.

Re: L19 Go Problem Championship: Round 14

Posted: Mon Jun 05, 2017 9:52 pm
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
All times are UTC-07:00
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