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L19 Go Problem Championship: Round 7

https://lifein19x19.com/viewtopic.php?t=14142

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L19 Go Problem Championship: Round 7

Posted: Sun Apr 02, 2017 10:06 pm
by Kirby
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! :salute:

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

:study:

Re: L19 Go Problem Championship: Round 7

Posted: Thu Apr 06, 2017 11:34 pm
by gamesorry
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]

Re: L19 Go Problem Championship: Round 7

Posted: Fri Apr 07, 2017 1:40 am
by Cassandra
@ 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]
;-)

Re: L19 Go Problem Championship: Round 7

Posted: Fri Apr 07, 2017 5:16 pm
by gamesorry
@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]

Re: L19 Go Problem Championship: Round 7

Posted: Sun Apr 09, 2017 8:21 pm
by Kirby
@EdLee:
Looks good. Nice analysis. 18 points.
@gamesorry:
Looks good. 18 points.
@Cassandra:
Nice :-)

Re: L19 Go Problem Championship: Round 7

Posted: Sun Apr 09, 2017 8:26 pm
by Kirby
Solutions and updated leader board are given below.

Problem 1


Problem 2


Problem 3


Leaderboard
  1. gamesorry - 101
  2. Schachus - 65
  3. EdLee - 61
  4. Shaddy - 49
  5. dfan - 43
  6. hyperpape - 19
  7. Lanrose - 16
  8. jeromie - 13
  9. mongus - 10

Re: L19 Go Problem Championship: Round 7

Posted: Mon Apr 10, 2017 12:28 am
by gamesorry
Oops, actually black's second move in my problem 3 was wrong ... Some points need to be deducted, I guess :)

Re: L19 Go Problem Championship: Round 7

Posted: Mon Apr 10, 2017 7:16 am
by Kirby
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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