Life In 19x19 :: L19 Go Problem Championship: Round 7

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L19 Go Problem Championship: Round 7 http://www.lifein19x19.com/viewtopic.php?f=15&t=14142	Page 1 of 1

Author: Kirby [ Sun Apr 02, 2017 10:06 pm ]

Post subject: L19 Go Problem Championship: Round 7

Welcome to Round 7 of the L19 Go Problem Championship.

Problems are a bit easier this week. If experience has taught me anything in hosting this competition, persistence typically leads to success :-)

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]$$Bc $$ ------------ $$ | . X . . . . $$ | . . X O . . $$ | . X O . O . $$ | . O O , . . $$ | . . . . . .[/go]

Problem 2 (6 points)

Click Here To Show Diagram Code: [go]$$Bc $$ ------------------ $$ . . . . . O . . . . | $$ . . X X O X O X X . | $$ . . X O O X O O . . | $$ , . . . X . , . X . | $$ . . X O O . O X . . | $$ . . X X . O X . X . | $$ . . . . X X X . . . | $$ . . . . . . . . . . |[/go]

Problem 3 (9 points)

Click Here To Show Diagram Code: [go]$$Bc $$ | . . . . . . . . . . . $$ | . . . . O O . . . . . $$ | . . O O X X O O O , . $$ | . O X X . . X X O . . $$ | . O . . . . . . O . . $$ | . . X . . X . X O . . $$ ----------------------[/go]

Have fun!

Author:	EdLee [ Sun Apr 02, 2017 10:51 pm ]
Post subject:
Click Here To Show Diagram Code `[go]$$B $$ ------------ $$ \| . X . . . . $$ \| 1 . X O . . $$ \| . X O . O . $$ \| . O O , . . $$ \| . . . . . .[/go]`

Author:	gamesorry [ Thu Apr 06, 2017 11:34 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 7
1. Click Here To Show Diagram Code `[go]$$Bc $$ ------------ $$ \| . X . . . . $$ \| 1 . X O . . $$ \| . X O . O . $$ \| . O O , . . $$ \| . . . . . .[/go]` 2. Click Here To Show Diagram Code `[go]$$Bc $$ ------------------ $$ . . . . . O . . . . \| $$ . . X X O X O X X . \| $$ . . X O O X O O . . \| $$ , . . 2 X 1 3 4 X . \| $$ . . X O O 5 O X . . \| $$ . . X X . O X . X . \| $$ . . . . X X X . . . \| $$ . . . . . . . . . . \|[/go]` (Cont'd) Click Here To Show Diagram Code `[go]$$Wc $$ ------------------ $$ . . . . . O . . . . \| $$ . . X X O . O X X . \| $$ . . X O O 3 O O . . \| $$ , . . O . 2 , O X . \| $$ . . X O O 4 1 X . . \| $$ . . X X . O X . X . \| $$ . . . . X X X . . . \| $$ . . . . . . . . . . \|[/go]` 3. ok, now I'll try playing the variations in my head Seki Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . $$ \| . . . . O O . . . . . $$ \| . . O O X X O O O , . $$ \| . O X X 3 . X X O . . $$ \| . O 6 7 2 4 8 1 O . . $$ \| . . X . 5 X . X O . . $$ ----------------------[/go]`

Author:	Cassandra [ Fri Apr 07, 2017 1:40 am ]
Post subject:	Re: L19 Go Problem Championship: Round 7
@ gamesorry: gamesorry wrote: 3. ok, now I'll try playing the variations in my head Seki Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . $$ \| . . . . O O . . . . . $$ \| . . O O X X O O O , . $$ \| . O X X 3 . X X O . . $$ \| . O 6 7 2 4 8 1 O . . $$ \| . . X . 5 X . X O . . $$ ----------------------[/go]` Are you really sure ? Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . $$ \| . . . . O O . . . . . $$ \| . . O O X X O O O , . $$ \| . O X X X M X X O . . $$ \| . O O X P P P X O . . $$ \| . . X . X X . X O . . $$ ----------------------[/go]`

Author:	gamesorry [ Fri Apr 07, 2017 5:16 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 7
@Cassandra Cassandra wrote: gamesorry wrote: 3. ok, now I'll try playing the variations in my head Seki Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . $$ \| . . . . O O . . . . . $$ \| . . O O X X O O O , . $$ \| . O X X 3 . X X O . . $$ \| . O 6 7 2 4 8 1 O . . $$ \| . . X . 5 X . X O . . $$ ----------------------[/go]` Are you really sure ? Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . $$ \| . . . . O O . . . . . $$ \| . . O O X X O O O , . $$ \| . O X X X M X X O . . $$ \| . O O X P P P X O . . $$ \| . . X . X X . X O . . $$ ----------------------[/go]` That's a big mistake! So this doesn't work as well: Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . $$ \| . . . . O O . . . . . $$ \| . . O O X X O O O , . $$ \| . O X X 3 5 X X O . . $$ \| . O 6 7 2 4 0 1 O . . $$ \| . . X 8 9 X . X O . . $$ ----------------------[/go]` So to avoid the T-shape, B3 should be: Click Here To Show Diagram Code `[go]$$Bc $$ \| . . . . . . . . . . . $$ \| . . . . O O . . . . . $$ \| . . O O X X O O O , . $$ \| . O X X . 3 X X O . . $$ \| . O 6 7 2 4 8 1 O . . $$ \| . . X . 5 X . X O . . $$ ----------------------[/go]`

Author:	Kirby [ Sun Apr 09, 2017 8:21 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 7
@EdLee: Looks good. Nice analysis. 18 points. @gamesorry: Looks good. 18 points. @Cassandra: Nice

Author:	Kirby [ Sun Apr 09, 2017 8:26 pm ]
Post subject:	Re: L19 Go Problem Championship: Round 7
Solutions and updated leader board are given below. Problem 1 Problem 2 Problem 3 Leaderboard gamesorry - 101 Schachus - 65 EdLee - 61 Shaddy - 49 dfan - 43 hyperpape - 19 Lanrose - 16 jeromie - 13 mongus - 10

Author:	gamesorry [ Mon Apr 10, 2017 12:28 am ]
Post subject:	Re: L19 Go Problem Championship: Round 7
Oops, actually black's second move in my problem 3 was wrong ... Some points need to be deducted, I guess

Author:	Kirby [ Mon Apr 10, 2017 7:16 am ]
Post subject:	Re: L19 Go Problem Championship: Round 7
Thanks for your honesty, gamesorry. I notice now that your ordering was different. I'll take a closer look going forward I've updated your points.

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