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

Posts: 7588
Liked others: 1379
Was liked: 1162
KGS: Kirby
Tygem: 커비라고해
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!

_________________
What have I learned from this game that I'll be able to use in my own game if the opportunity presents itself?

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 Post subject: #2 Posted: Sun Apr 02, 2017 10:51 pm
 Judan

Posts: 7600
Location: Santa Barbara, CA
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GD Posts: 312
Click Here To Show Diagram Code
`[go]\$\$B\$\$ ------------\$\$ | . X . . . .\$\$ | 1 . X O . .\$\$ | . X O . O .\$\$ | . O O , . .\$\$ | . . . . . .[/go]`

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

Posts: 136
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Was liked: 42
Rank: Chinese 3d
KGS: 3d
DGS: 3d
OGS: 3d
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 #4 Posted: Fri Apr 07, 2017 1:40 am
 Lives in sente

Posts: 705
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Rank: German 1 Kyu
@ 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]`

_________________
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 #5 Posted: Fri Apr 07, 2017 5:16 pm
 Lives with ko

Posts: 136
Liked others: 182
Was liked: 42
Rank: Chinese 3d
KGS: 3d
DGS: 3d
OGS: 3d
@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 #6 Posted: Sun Apr 09, 2017 8:21 pm
 Judan

Posts: 7588
Liked others: 1379
Was liked: 1162
KGS: Kirby
Tygem: 커비라고해
@EdLee:
Looks good. Nice analysis. 18 points.

@gamesorry:
Looks good. 18 points.

@Cassandra:
Nice

_________________
What have I learned from this game that I'll be able to use in my own game if the opportunity presents itself?

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

Posts: 7588
Liked others: 1379
Was liked: 1162
KGS: Kirby
Tygem: 커비라고해
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

_________________
What have I learned from this game that I'll be able to use in my own game if the opportunity presents itself?

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

Posts: 136
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Rank: Chinese 3d
KGS: 3d
DGS: 3d
OGS: 3d
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 #9 Posted: Mon Apr 10, 2017 7:16 am
 Judan

Posts: 7588
Liked others: 1379
Was liked: 1162
KGS: Kirby
Tygem: 커비라고해
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.

_________________
What have I learned from this game that I'll be able to use in my own game if the opportunity presents itself?

 This post by Kirby was liked by: gamesorry
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