L19 Go Problem Championship: Round 14

Kirby · Post by **Kirby** » Mon May 29, 2017 8:40 pm

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!

EdLee · Post by **EdLee** » Mon May 29, 2017 8:52 pm

Shaddy · Post by **Shaddy** » Tue May 30, 2017 8:25 am

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:

Kirby · Post by **Kirby** » Tue May 30, 2017 9:34 am

@EdLee:

Kirby · Post by **Kirby** » Tue May 30, 2017 9:38 am

@Shaddy:

Marcus · Post by **Marcus** » Tue May 30, 2017 10:52 am

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]

Shaddy · Post by **Shaddy** » Tue May 30, 2017 9:27 pm

Kirby wrote:@Shaddy:
Problems 1 and 3 are correct. I agree that is amazing. I heard that Dosaku came up with this move.

For Problem 2, do you have a response to this?
$$B
$$ ---------------------
$$ . . 2 C O O 1 . O . |
$$ . . O O X . . X . X |
$$ . . O X X X X O X . |
$$ , . O . . . , O X . |
$$ . . . . O O . O O . |
$$ . . . . . . . . . . |

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]

gamesorry · Post by **gamesorry** » Sat Jun 03, 2017 12:29 pm

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]

Shaddy · Post by **Shaddy** » Sun Jun 04, 2017 5:58 am

Problem 3 is not to capture White, but to save the 5 black stones.

unkx80 · Post by **unkx80** » Mon Jun 05, 2017 6:14 am

Marcus wrote:
$$Bcm11
$$ | . . . . . . . . . . . . .
$$ | . . . O . . . . . . . . .
$$ | . . . . . . . 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 . . . . . . . . .
$$ --------------------------

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]

Kirby · Post by **Kirby** » Mon Jun 05, 2017 9:45 pm

@Marcus:

Kirby · Post by **Kirby** » Mon Jun 05, 2017 9:46 pm

@gamesorry:

Kirby · Post by **Kirby** » Mon Jun 05, 2017 9:52 pm

Solutions and updated leader board are given below.

Problem 1

Problem 2

Problem 3

Leaderboard

gamesorry - 157
EdLee - 109
dfan - 101
Shaddy - 85
Schachus - 77
hyperpape - 39
jeromie - 31
mongus - 19
Lanrose - 16
ez4u - 9
fractic - 6
Marcus - 5

Life In 19x19

L19 Go Problem Championship: Round 14

L19 Go Problem Championship: Round 14

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Re: L19 Go Problem Championship: Round 14

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Re: L19 Go Problem Championship: Round 14

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Re: L19 Go Problem Championship: Round 14

Re: L19 Go Problem Championship: Round 14