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 Post subject: L19 Go Problem Championship: Round 5 #1 Posted: Sun Mar 19, 2017 8:23 pm
 Judan

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Welcome to Round 5 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 . . . . . . \$\$ | . X O X X X O . O . \$\$ | . X X O O O O . . . \$\$ | O O O , . . . . . , \$\$ | . . . . . . . . . .[/go]`

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

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

Have fun!

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Discipline is remembering what you want. -David Campbell

 This post by Kirby was liked by: dfan
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 Post subject: #2 Posted: Sun Mar 19, 2017 11:35 pm
 Judan

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`[go]\$\$B\$\$ --------------------\$\$| . O . X . . . . . . \$\$| . X O X X X O . O . \$\$| . X X O O O O . . . \$\$| O O O , . . . . . , \$\$| . . . . . . . . . .[/go]`
`[go]\$\$B (a), (b) miai life\$\$ --------------------\$\$| . O a X . b . . . . \$\$| 1 X O X X X O . O . \$\$| . X X O O O O . . . \$\$| O O O , . . . . . , \$\$| . . . . . . . . . .[/go]`
`[go]\$\$B ko for life\$\$ --------------------\$\$| . O 1 X . 3 . . . . \$\$| 2 X O X X X O . O . \$\$| . X X O O O O . . . \$\$| O O O , . . . . . , \$\$| . . . . . . . . . .[/go]`
`[go]\$\$B ko for life\$\$ --------------------\$\$| . O X X . X . . . . \$\$| O X . X X X O . O . \$\$| 4 X X O O O O . . . \$\$| O O O , . . . . . , \$\$| . . . . . . . . . .[/go]`
`[go]\$\$B\$\$----------------------\$\$ . X . . . . O X X . |\$\$ . X O . . X . O X . |\$\$ . X O . O O O O X . |\$\$ , X . X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`
W lives:
`[go]\$\$B at \$\$----------------------\$\$ . X . . 4 1 W X X . |\$\$ . X O . 2 X 3 O X . |\$\$ . X O 6 O O O O X . |\$\$ , X . X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

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

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

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 Post subject: Re: L19 Go Problem Championship: Round 5 #3 Posted: Mon Mar 20, 2017 7:41 pm
 Judan

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@EdLee:
Problem 1 is correct.

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 Post subject: Re: L19 Go Problem Championship: Round 5 #4 Posted: Tue Mar 21, 2017 5:19 am
 Dies with sente

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Problem 1 :

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

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 Post subject: Re: L19 Go Problem Championship: Round 5 #5 Posted: Tue Mar 21, 2017 11:17 am
 Tengen

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Problem 1
Ko. Black takes first.

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

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 Post subject: Re: L19 Go Problem Championship: Round 5 #6 Posted: Tue Mar 21, 2017 2:27 pm
 Judan

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mongus wrote:
Problem 1 :

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

@mongus:
Correct!

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Discipline is remembering what you want. -David Campbell

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 Post subject: Re: L19 Go Problem Championship: Round 5 #7 Posted: Tue Mar 21, 2017 2:28 pm
 Judan

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hyperpape wrote:
Problem 1
Ko. Black takes first.

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

@hyperpape:
Good work! Can you get better than ko, now?

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 Post subject: Re: L19 Go Problem Championship: Round 5 #8 Posted: Tue Mar 21, 2017 10:59 pm
 Lives with ko

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

2.

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

Variation: after B5, a and b miai
`[go]\$\$Bc \$\$ --------------------\$\$ . X 5 3 a . O X X . |\$\$ . X O 2 1 X 4 O X . |\$\$ . X O b O O O O X . |\$\$ , X . X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

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

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

B3 & W4 fails:
`[go]\$\$Bc 9=1\$\$ --------------------\$\$ . X 7 5 4 8 O X X . |\$\$ . X O 2 1 X 6 O X . |\$\$ . X O 3 O O O O X . |\$\$ , X . X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

However, with B3 white has strong resistance:
`[go]\$\$Bc\$\$ --------------------\$\$ . X 7 4 8 9 O X X . |\$\$ . X O 2 1 X 6 O X . |\$\$ . X O 3 O O O O X . |\$\$ , X 5 X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

(Cont'd)
`[go]\$\$Wc\$\$ --------------------\$\$ . X X 2 3 X O X X . |\$\$ . X . 1 X X O O X . |\$\$ . X . X O O O O X . |\$\$ , X X X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

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

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

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

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

3.
Ko:
`[go]\$\$Bc\$\$ | . . . . . . . . . . . .\$\$ | . . . . . . . . . . . .\$\$ | . . . . . X X X X . . .\$\$ | . . . . X O O O O X X .\$\$ | . . . X . 4 . 5 9 O X .\$\$ | . X . X O . O 8 . O X .\$\$ | . X . . X 2 1 0 O . X .\$\$ | . . X . . 3 6 7 O O X .\$\$ ------------------------[/go]`

B5 fails:
`[go]\$\$Bc\$\$ | . . . . . . . . . . . .\$\$ | . . . . . . . . . . . .\$\$ | . . . . . X X X X . . .\$\$ | . . . . X O O O O X X .\$\$ | . . . X . 4 . 6 . O X .\$\$ | . X . X O . O . . O X .\$\$ | . X . . X 2 1 . O . X .\$\$ | . . X . . 3 5 . O O X .\$\$ ------------------------[/go]`

W4 fails:
`[go]\$\$Bc\$\$ | . . . . . . . . . . . .\$\$ | . . . . . . . . . . . .\$\$ | . . . . . X X X X . . .\$\$ | . . . . X O O O O X X .\$\$ | . . . X 8 . 9 0 b O X .\$\$ | . X . X O 4 O 6 a O X .\$\$ | . X . . X 2 1 c O 7 X .\$\$ | . . X . . 3 5 . O O X .\$\$ ------------------------[/go]`

Variation:
`[go]\$\$Bc\$\$ | . . . . . . . . . . . .\$\$ | . . . . . . . . . . . .\$\$ | . . . . . X X X X . . .\$\$ | . . . . X O O O O X X .\$\$ | . . . X 8 7 . 6 . O X .\$\$ | . X . X O 4 O 9 . O X .\$\$ | . X . . X 2 1 . O . X .\$\$ | . . X . . 3 5 . O O X .\$\$ ------------------------[/go]`

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

Variation:
After 7, a and b miai
`[go]\$\$Bc\$\$ | . . . . . . . . . . . .\$\$ | . . . . . . . . . . . .\$\$ | . . . . . X X X X . . .\$\$ | . . . . X O O O O X X .\$\$ | . . . X 7 5 a 2 . O X .\$\$ | . X . X O 4 O . b O X .\$\$ | . X . . X 3 1 6 O . X .\$\$ | . . X . . . . . O O X .\$\$ ------------------------[/go]`

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

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

B fails
`[go]\$\$Bc\$\$ | . . . . . . . . . . . .\$\$ | . . . . . . . . . . . .\$\$ | . . . . . X X X X . . .\$\$ | . . . . X O O O O X X .\$\$ | . . . X 6 . 7 5 . O X .\$\$ | . X . X O 4 O 3 . O X .\$\$ | . X . . X 1 2 . O . X .\$\$ | . . X . . . 8 . O O X .\$\$ ------------------------[/go]`

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

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

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 Post subject: Re: L19 Go Problem Championship: Round 5 #9 Posted: Wed Mar 22, 2017 6:24 am
 Tengen

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Problem 1 redux:
`[go]\$\$Bc\$\$ --------------------\$\$ | c O a X . b . . . . \$\$ | 1 X O X X X O . O . \$\$ | . X X O O O O . . . \$\$ | O O O , . . . . . , \$\$ | . . . . . . . . . .[/go]`

a and b are miai. Black either makes an eye to the left of b or two eyes from captures at a and c.

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 Post subject: Re: L19 Go Problem Championship: Round 5 #10 Posted: Wed Mar 22, 2017 8:47 am
 Judan

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@gamesorry:
Problems 1 and 2 are correct.

For Problem 3, did you consider this?

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

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 Post subject: Re: L19 Go Problem Championship: Round 5 #11 Posted: Wed Mar 22, 2017 8:48 am
 Judan

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@hyperpape:

You've got it! Good work

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 Post subject: Re: L19 Go Problem Championship: Round 5 #12 Posted: Wed Mar 22, 2017 7:46 pm
 Tengen

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Problem 2:
This one was funny, at least if I've managed to get it right. It was pretty easy to see that a, b, and c fail, so I was looking at d.
`[go]\$\$Bc\$\$ -------------------- \$\$ . X . . . a O X X . |\$\$ . X O c d X b O X . |\$\$ . X O . O O O O X . |\$\$ , X . X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

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

For the longest time, I had read this far, but couldn't see that made a false eye after B connects. I had to set up a board to see that there's a throw-in.

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 Post subject: Re: L19 Go Problem Championship: Round 5 #13 Posted: Wed Mar 22, 2017 9:45 pm
 Judan

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hyperpape wrote:
Problem 2:
This one was funny, at least if I've managed to get it right. It was pretty easy to see that a, b, and c fail, so I was looking at d.
`[go]\$\$Bc\$\$ -------------------- \$\$ . X . . . a O X X . |\$\$ . X O c d X b O X . |\$\$ . X O . O O O O X . |\$\$ , X . X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

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

For the longest time, I had read this far, but couldn't see that made a false eye after B connects. I had to set up a board to see that there's a throw-in.

@hyperpape:
Did you consider this move?
`[go]\$\$Bc\$\$ -------------------- \$\$ . X . 4 . . O X X . |\$\$ . X O 2 1 X . O X . |\$\$ . X O 3 O O O O X . |\$\$ , X . X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

Hint:
You are pretty close.

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 Post subject: Re: L19 Go Problem Championship: Round 5 #14 Posted: Thu Mar 23, 2017 8:07 am
 Tengen

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Kirby wrote:
@hyperpape:
[hide]Did you consider this move?
`[go]\$\$Bc\$\$ -------------------- \$\$ . X . 4 . . O X X . |\$\$ . X O 2 1 X . O X . |\$\$ . X O 3 O O O O X . |\$\$ , X . X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

Not in detail. I think I figured that there weren't enough liberties. So the issue is this under the stones play?
`[go]\$\$Bc\$\$ -------------------- \$\$ . X 3 O 4 5 O X X . |\$\$ . X O O X X 2 O X . |\$\$ . X O X O O O O X . |\$\$ , X 1 X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

Maybe if we change the order of moves?
`[go]\$\$Bc\$\$ -------------------- \$\$ . X 4 3 6 . O X X . |\$\$ . X O 2 1 X . O X . |\$\$ . X O 5 O O O O X . |\$\$ , X 7 X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

White can try the throw in.
`[go]\$\$Bc\$\$ -------------------- \$\$ . X 5 3 4 . O X X . |\$\$ . X O 2 1 X 6 O X . |\$\$ . X O . O O O O X . |\$\$ , X . X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

But we're back to Black being able to make the eye false.
`[go]\$\$Bc\$\$ -------------------- \$\$ . X 7 3 4 . O X X . |\$\$ . X O 2 1 X 6 O X . |\$\$ . X O 5 O O O O X . |\$\$ , X . X X O , O X . |\$\$ . X . . . O O X . . |\$\$ . . . . X X X X . . |\$\$ . . . . . . . . . . |[/go]`

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 Post subject: Re: L19 Go Problem Championship: Round 5 #15 Posted: Thu Mar 23, 2017 9:56 am
 Judan

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@hyperpape:
Yup! The under-the-stones trick was the thing to watch out for, and you found it. Changing the order of moves fixes the problem, and solves it.

You're on a roll.

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 Post subject: Re: L19 Go Problem Championship: Round 5 #16 Posted: Thu Mar 23, 2017 8:02 pm
 Judan

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Since we started a bit late this week, I'll wait until about 24 hours from now to post solutions.

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 Post subject: Re: L19 Go Problem Championship: Round 5 #17 Posted: Fri Mar 24, 2017 6:33 am
 Tengen

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Problem 3

Hard to even know where to start here. Maybe with the right incursions, we can limit White to a dead eye-space near the marked points?
`[go]\$\$Bc\$\$ | . . . . . . . . . . . . \$\$ | . . . . . . . . . . . . \$\$ | . . . . . X X X X . . . \$\$ | . . . . X O O O O X X . \$\$ | . . . X . . . M M O X . \$\$ | . X . X O . O M M O X . \$\$ | . X . . X . . M O . X . \$\$ | . . X . . . . . O O X . \$\$ ------------------------[/go]`

The a and b points are jumping out at me.
`[go]\$\$Bc\$\$ | . . . . . . . . . . . . \$\$ | . . . . . . . . . . . . \$\$ | . . . . . X X X X . . . \$\$ | . . . . X O O O O X X . \$\$ | . . . X . . . . . O X . \$\$ | . X . X O . O a . O X . \$\$ | . X . . X ..b . O . X . \$\$ | . . X . . . . . O O X . \$\$ ------------------------[/go]`

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

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

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

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

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

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 Post subject: Re: L19 Go Problem Championship: Round 5 #18 Posted: Fri Mar 24, 2017 6:44 pm
 Lives with ko

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Kirby wrote:
@gamesorry:
For Problem 3, did you consider this?

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

Oops, I overlooked that.

So after 2 B has to play 3, but after W4B5, W has 6 and 8
`[go]\$\$Bc\$\$ | . . . . . . . . . . . .\$\$ | . . . . . . . . . . . .\$\$ | . . . . . X X X X . . .\$\$ | . . . . X O O O O X X .\$\$ | . . . X 5 3 . . . O X .\$\$ | . X . X O 4 O 2 . O X .\$\$ | . X . . X 6 1 . O . X .\$\$ | . . X . . 7 8 . O O X .\$\$ ------------------------[/go]`

Therefore, to prevent 6 and 8, B need to consider something like:
`[go]\$\$Bc\$\$ | . . . . . . . . . . . .\$\$ | . . . . . . . . . . . .\$\$ | . . . . . X X X X . . .\$\$ | . . . . X O O O O X X .\$\$ | . . . X 5 3 . . . O X .\$\$ | . X . X O 4 O 2 . O X .\$\$ | . X . . X 9 6 . O . X .\$\$ | . . X . . 8 1 7 O O X .\$\$ ------------------------[/go]`

B still needs to be careful: B3 fails
`[go]\$\$Bc\$\$ | . . . . . . . . . . . .\$\$ | . . . . . . . . . . . .\$\$ | . . . . . X X X X . . .\$\$ | . . . . X O O O O X X .\$\$ | . . . X . 6 . 4 8 O X .\$\$ | . X . X O . O 3 5 O X .\$\$ | . X . . X . 2 7 O . X .\$\$ | . . X . . . 1 . O O X .\$\$ ------------------------[/go]`

Therefore, B3 should:
`[go]\$\$Bc\$\$ | . . . . . . . . . . . .\$\$ | . . . . . . . . . . . .\$\$ | . . . . . X X X X . . .\$\$ | . . . . X O O O O X X .\$\$ | . . . X . 3 . . . O X .\$\$ | . X . X O . O 4 . O X .\$\$ | . X . . X . 2 . O . X .\$\$ | . . X . . . 1 5 O O X .\$\$ ------------------------[/go]`

(Please deduct at least half of the points even if this is correct.)

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 Post subject: Re: L19 Go Problem Championship: Round 5 #19 Posted: Fri Mar 24, 2017 11:13 pm
 Judan

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Solutions and updated leader board are given below.

Problem 1

Problem 2

Problem 3

1. gamesorry - 82
3. Schachus - 43
4. EdLee - 38
5. dfan - 25
6. Lanrose - 16
7. hyperpape - 15
8. jeromie - 13
9. mongus - 10

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 Post subject: Re: L19 Go Problem Championship: Round 5 #20 Posted: Fri Mar 24, 2017 11:51 pm
 Lives with ko

Posts: 135
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Rank: Chinese 3d
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OGS: 3d
Ah, I excluded the correct answer in the beginning due to the following W2:
`[go]\$\$Bc\$\$ | . . . . . . . . . . . .\$\$ | . . . . . . . . . . . .\$\$ | . . . . . X X X X . . .\$\$ | . . . . X O O O O X X .\$\$ | . . . X . 1 . . . O X .\$\$ | . X . X O . O 2 . O X .\$\$ | . X . . X a b . O . X .\$\$ | . . X . . . c . O O X .\$\$ ------------------------[/go]`

a and b obviously do not work, but actually c works. However, playing c first doesn't work. Nice problem!

 This post by gamesorry was liked by: Kirby
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