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 Post subject: L19 Go Problem Championship: Round 7
Post #1 Posted: Sun Apr 02, 2017 10:06 pm 
Judan

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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:

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Post #2 Posted: Sun Apr 02, 2017 10:51 pm 
Judan
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Click Here To Show Diagram Code
[go]$$B
$$ ------------
$$ | . X . . . .
$$ | 1 . X O . .
$$ | . X O . O .
$$ | . O O , . .
$$ | . . . . . .[/go]

:study:

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 Post subject: Re: L19 Go Problem Championship: Round 7
Post #3 Posted: Thu Apr 06, 2017 11:34 pm 
Lives with ko

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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]

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 Post subject: Re: L19 Go Problem Championship: Round 7
Post #4 Posted: Fri Apr 07, 2017 1:40 am 
Lives in sente
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@ 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]


;-)

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The really most difficult Go problem ever: http://igohatsuyoron120.de/index.htm
Igo Hatsuyoron #120 (still unresolved by professionals, maybe solved by three amateurs)

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 Post subject: Re: L19 Go Problem Championship: Round 7
Post #5 Posted: Fri Apr 07, 2017 5:16 pm 
Lives with ko

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@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]

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 Post subject: Re: L19 Go Problem Championship: Round 7
Post #6 Posted: Sun Apr 09, 2017 8:21 pm 
Judan

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@EdLee:
Looks good. Nice analysis. 18 points.


@gamesorry:
Looks good. 18 points.


@Cassandra:
Nice :-)

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 Post subject: Re: L19 Go Problem Championship: Round 7
Post #7 Posted: Sun Apr 09, 2017 8:26 pm 
Judan

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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

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 Post subject: Re: L19 Go Problem Championship: Round 7
Post #8 Posted: Mon Apr 10, 2017 12:28 am 
Lives with ko

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Oops, actually black's second move in my problem 3 was wrong ... Some points need to be deducted, I guess :)

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 Post subject: Re: L19 Go Problem Championship: Round 7
Post #9 Posted: Mon Apr 10, 2017 7:16 am 
Judan

Posts: 7588
Liked others: 1379
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KGS: Kirby
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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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