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 Post subject: L19 Go Problem Championship: Round 6 #1 Posted: Fri Mar 24, 2017 11:18 pm
 Judan

Posts: 7588
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KGS: Kirby
Tygem: 커비라고해
Welcome to Round 6 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)
`[go]\$\$Bc\$\$ ------------------\$\$ | . . . . . O X . . \$\$ | . . . O O O X . . \$\$ | . O O X X X X . . \$\$ | . X X , . . . . . \$\$ | . . . . . . . . .[/go]`

Problem 2 (6 points)
`[go]\$\$Bc\$\$ ----------------- \$\$ . . . . . O . O . |\$\$ . X X . . . O X . |\$\$ . X O O . . O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`

Problem 3 (9 points)
`[go]\$\$Bc\$\$ | . . . . . . . . . . . \$\$ | . . . . X X X X X . . \$\$ | . . X X O . . . . X . \$\$ | . X . O . . O . O X . \$\$ | . X O O . O . . O X . \$\$ | . . X . . . . . . X . \$\$ ----------------------[/go]`

Have fun!

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 Post subject: #2 Posted: Sat Mar 25, 2017 4:04 am
 Judan

Posts: 7600
Location: Santa Barbara, CA
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`[go]\$\$B\$\$ -------------------\$\$ | . . . . . O X . . \$\$ | . . . O O O X . . \$\$ | . O O X X X X . . \$\$ | . X X , . . . . . \$\$ | . . . . . . . . .[/go]`
Feeling:
`[go]\$\$B (a), (b) miai kill\$\$ -------------------\$\$ | . . . . . O X . . \$\$ | . 1 b O O O X . . \$\$ | a O O X X X X . . \$\$ | . X X , . . . . . \$\$ | . . . . . . . . .[/go]`
`[go]\$\$B\$\$ -------------------\$\$ | . . . . . O X . . \$\$ | 2 1 3 O O O X . . \$\$ | 4 O O X X X X . . \$\$ | 5 X X , . . . . . \$\$ | . . . . . . . . .[/go]`

`[go]\$\$B\$\$ -------------------\$\$ . . . . . O . O . |\$\$ . X X . . . O X . |\$\$ . X O O . . O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`
Feeling:
`[go]\$\$B\$\$ -------------------\$\$ . . . . . O . O . |\$\$ . X X . 1 . O X . |\$\$ . X O O . . O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`

`[go]\$\$B\$\$ | . . . . . . . . . . . \$\$ | . . . . X X X X X . . \$\$ | . . X X O . . . . X . \$\$ | . X . O . . O . O X . \$\$ | . X O O . O . . O X . \$\$ | . . X . . . . . . X . \$\$ -----------------------[/go]`
Feeling:
`[go]\$\$B\$\$ | . . . . . . . . . . . \$\$ | . . . . X X X X X . . \$\$ | . . X X O . . . . X . \$\$ | . X . O . . O . O X . \$\$ | . X O O . O . 1 O X . \$\$ | . . X . . . . . . X . \$\$ -----------------------[/go]`

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 Post subject: Re: L19 Go Problem Championship: Round 6 #3 Posted: Fri Mar 31, 2017 12:00 am
 Lives with ko

Posts: 136
Liked others: 182
Was liked: 42
Rank: Chinese 3d
KGS: 3d
DGS: 3d
OGS: 3d
1.
`[go]\$\$Bc\$\$ ------------------\$\$ | . . . . . O X . .\$\$ | . 1 2 O O O X . .\$\$ | 3 O O X X X X . .\$\$ | . X X , . . . . .\$\$ | . . . . . . . . .[/go]`

Variation:
`[go]\$\$Bc\$\$ ------------------\$\$ | . . . . . O X . .\$\$ | 2 1 3 O O O X . .\$\$ | . O O X X X X . .\$\$ | . X X , . . . . .\$\$ | . . . . . . . . .[/go]`

2.

`[go]\$\$Bc\$\$ -----------------\$\$ . . 6 3 4 O . O . |\$\$ . X X 2 1 . O X . |\$\$ . X O O 7 5 O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`

Variation:
`[go]\$\$Bc\$\$ -----------------\$\$ . . . 3 5 O . O . |\$\$ . X X 2 1 . O X . |\$\$ . X O O 4 . O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`

B3 fails (seki)
`[go]\$\$Bc\$\$ -----------------\$\$ . . . 5 6 O . O . |\$\$ . X X 2 1 . O X . |\$\$ . X O O 3 4 O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`

B3 fails
`[go]\$\$Bc\$\$ -----------------\$\$ . . . 5 . O . O . |\$\$ . X X 2 1 6 O X . |\$\$ . X O O 4 3 O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`

3.
Intuitions (a-g):
`[go]\$\$Bc\$\$ | . . . . . . . . . . .\$\$ | . . . . X X X X X . .\$\$ | . . X X O d . e . X .\$\$ | . X . O g . O . O X .\$\$ | . X O O . O . b O X .\$\$ | . . X . f . a . c X .\$\$ ----------------------[/go]`

Need to study more

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 Post subject: Re: L19 Go Problem Championship: Round 6 #4 Posted: Fri Mar 31, 2017 1:03 pm
 Judan

Posts: 7588
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Was liked: 1162
KGS: Kirby
Tygem: 커비라고해
@gamesorry:
Correct on the first two problems. I'll release solutions this evening (8~10 hours from now?).

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 Post subject: Re: L19 Go Problem Championship: Round 6 #5 Posted: Sat Apr 01, 2017 10:49 am
 Tengen

Posts: 4044
Location: North Carolina
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Rank: AGA 3k
GD Posts: 65
OGS: Hyperpape 4k
Problem 1
`[go]\$\$Bc\$\$ ------------------\$\$ | 5 . 6 . . O X . . \$\$ | 4 1 2 O O O X . . \$\$ | 3 O O X X X X . . \$\$ | . X X , . . . . . \$\$ | . . . . . . . . .[/go]`

`[go]\$\$Bc\$\$ ------------------\$\$ | . . . . . O X . . \$\$ | 2 1 3 O O O X . . \$\$ | . O O X X X X . . \$\$ | . X X , . . . . . \$\$ | . . . . . . . . .[/go]`

Problem 2
`[go]\$\$Bc\$\$ ----------------- \$\$ . . . . 4 O . O . |\$\$ . X X 3 2 . O X . |\$\$ . X O O 1 5 O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`

`[go]\$\$Bc\$\$ ----------------- \$\$ . . . . 4 O . O . |\$\$ . X X 2 3 . O X . |\$\$ . X O O 1 5 O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`

I feel like I must be missing some complication?

`[go]\$\$Bc\$\$ ----------------- \$\$ . . . 5 6 O . O . |\$\$ . X X 4 3 . O X . |\$\$ . X O O 1 2 O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`

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 Post subject: Re: L19 Go Problem Championship: Round 6 #6 Posted: Sat Apr 01, 2017 12:36 pm
 Judan

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@ hyperpape

`[go]\$\$Bc Two eyes\$\$ -----------------\$\$ . . . . . O . O . |\$\$ . X X 3 2 . O X . |\$\$ . X O O 1 4 O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`

`[go]\$\$Bc Seki\$\$ -----------------\$\$ . . . 5 . O . O . |\$\$ . X X 4 2 . O X . |\$\$ . X O O 1 3 O X . |\$\$ . X O . X O X . . |\$\$ . X O O O O X . . |\$\$ . . X X X X X . . |\$\$ . . . . . . . . . |[/go]`

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 Post subject: Re: L19 Go Problem Championship: Round 6 #7 Posted: Sun Apr 02, 2017 10:00 pm
 Judan

Posts: 7588
Liked others: 1379
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KGS: Kirby
Tygem: 커비라고해
Thanks for helping out, Bill. It's been a busier weekend than expected, so I was a little bit delayed

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 Post subject: Re: L19 Go Problem Championship: Round 6 #8 Posted: Sun Apr 02, 2017 10:00 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

1. gamesorry - 91
2. Schachus - 52
4. EdLee - 43
5. dfan - 34
6. hyperpape - 19
7. Lanrose - 16
8. jeromie - 13
9. mongus - 10

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 Post subject: Re: L19 Go Problem Championship: Round 6 #9 Posted: Mon Apr 03, 2017 1:15 am
 Lives with ko

Posts: 136
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Rank: Chinese 3d
KGS: 3d
DGS: 3d
OGS: 3d
@Kirby
Thank you for waiting, sorry that I was busy this weekend and didn't get to think over the third one (the 2nd intuition was correct, so my neural network needs a little tuning )

 This post by gamesorry was liked by: Kirby
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 Post subject: Re: L19 Go Problem Championship: Round 6 #10 Posted: Mon Apr 03, 2017 10:26 am
 Judan

Posts: 7588
Liked others: 1379
Was liked: 1162
KGS: Kirby
Tygem: 커비라고해
gamesorry wrote:
@Kirby
Thank you for waiting, sorry that I was busy this weekend and didn't get to think over the third one (the 2nd intuition was correct, so my neural network needs a little tuning )

I totally understand

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