Life In 19x19 :: L19 Go Problem Championship: Round 13

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L19 Go Problem Championship: Round 13 http://lifein19x19.com/viewtopic.php?f=15&t=14233	Page 1 of 1

Author: Kirby [ Sun May 14, 2017 10:55 pm ]

Post subject: L19 Go Problem Championship: Round 13

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:

Author:	EdLee [ Mon May 15, 2017 2:24 am ]
Post subject:
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 any time instead of { .. }, then B simply squeezes. 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]` 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]`

Author:	Kirby [ Mon May 15, 2017 9:29 am ]
Post subject:	Re: L19 Go Problem Championship: Round 13
@EdLee: You are correct.

Author:	hyperpape [ Mon May 15, 2017 10:10 am ]
Post subject:	Re: L19 Go Problem Championship: Round 13
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 and then c captures.

Author:	jeromie [ Mon May 15, 2017 10:16 am ]
Post subject:	Re: L19 Go Problem Championship: Round 13
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.

Author:	Kirby [ Mon May 15, 2017 10:29 am ]
Post subject:	Re: L19 Go Problem Championship: Round 13
@hyperpape: Spot on.

Author:	Kirby [ Mon May 15, 2017 10:29 am ]
Post subject:	Re: L19 Go Problem Championship: Round 13
@jeromie: You've got it.

Author:	Shaddy [ Tue May 16, 2017 1:16 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 13
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]`

Author:	Kirby [ Tue May 16, 2017 1:51 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 13
@Shaddy Yep. There are other variations for problem 3, but that's probably the most interesting one.

Author:	Shaddy [ Tue May 16, 2017 5:55 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 13
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]`

Author:	Kirby [ Tue May 16, 2017 9:07 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 13
@Shaddy: Is necessary?

Author:	Shaddy [ Tue May 16, 2017 9:25 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 13
Kirby wrote: @Shaddy: Is necessary? Hm, 7 at b is ok.

Author:	Kirby [ Tue May 16, 2017 9:47 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 13
I should clarify for Problem 3: You don't need to save all the stones, necessarily. You just need to live.

Author:	gamesorry [ Tue May 16, 2017 11:40 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 13
1. After , 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

Author:	EdLee [ Wed May 17, 2017 2:12 am ]
Post subject:
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 . )

Author:	Kirby [ Sun May 21, 2017 10:35 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 13
Round 13 will be extended by one week. Please feel free to submit solutions until then.

Author:	Kirby [ Mon May 29, 2017 8:38 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 13
Solutions and updated leader board are given below. Problem 1 Problem 2 Problem 3 Leaderboard gamesorry - 147 EdLee - 105 dfan - 97 Schachus - 77 Shaddy - 67 hyperpape - 39 jeromie - 31 mongus - 19 Lanrose - 16 ez4u - 9 fractic - 6

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