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L19 Go Problem Championship: Round 3

https://lifein19x19.com/viewtopic.php?t=14054

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L19 Go Problem Championship: Round 3

Posted: Fri Mar 03, 2017 12:04 am
by Kirby
Welcome to Round 3 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)
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------
$$ | . . . . . O . .
$$ | X O . . . O . .
$$ | . X X X O . O .
$$ | . O O O O . . .
$$ | . . . . . . . .[/go]

Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | . X O O O X . . .
$$ | . O . . . X . X .
$$ | . . . O . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]


Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O , X X . . .
$$ | O . . . O X . X .
$$ | . O . . . O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Have fun!

Re: L19 Go Problem Championship: Round 3

Posted: Fri Mar 03, 2017 12:50 am
by gamesorry
1. Two eyes
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------
$$ | . 1 . . . O . .
$$ | X O . . . O . .
$$ | . X X X O . O .
$$ | . O O O O . . .
$$ | . . . . . . . .[/go]
2. Clamp
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | 5 X O O O X . . .
$$ | 2 O 3 6 . X . X .
$$ | 7 1 4 O . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
Variation: B3 might leave to a little more complicated variations, but still kills
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | . X O O O X . . .
$$ | 2 O 4 9 5 X . X .
$$ | 6 1 3 O 8 c d . .
$$ | a 7 b f . e . . .
$$ ------------------[/go]
Variation: Ko, B fails
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | 4 X O O O X . . .
$$ | 1 O 5 . . X . X .
$$ | 2 3 6 O . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
Variation: B fails
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | . X O O O X . . .
$$ | . O . . . X . X .
$$ | . . 2 O 1 . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
3.
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O 7 X X . . .
$$ | O 6 3 4 O X . X .
$$ | . O 2 1 5 O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
Variation:
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O , X X . . .
$$ | O . 2 4 O X . X .
$$ | . O 3 1 5 O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Variation: after 3, a and b are miai
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O , X X . . .
$$ | O . b 2 O X . X .
$$ | . O a 1 3 O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Variation: B fails - order matters
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O , X X . . .
$$ | O . 1 2 O X . X .
$$ | . O . 3 4 O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Variation: B fails
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O , X X . . .
$$ | O . 3 2 O X . X .
$$ | . O 1 4 . O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
Variation: B fails
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O , X X . . .
$$ | O . 2 1 O X . X .
$$ | . O 4 3 . O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Re: L19 Go Problem Championship: Round 3

Posted: Fri Mar 03, 2017 12:52 am
by Kirby
@gamesorry:
Perfect. A little easy this week, I guess :-)

Re: L19 Go Problem Championship: Round 3

Posted: Fri Mar 03, 2017 1:00 am
by gamesorry
@Kirby
Kirby wrote:@gamesorry:
Perfect. A little easy this week, I guess :-)
Thanks :-) I think problem 3 is easier than before because the best result is not a ko. But still, good problems!

Re: L19 Go Problem Championship: Round 3

Posted: Fri Mar 03, 2017 1:04 am
by Kirby
gamesorry wrote:@Kirby
Kirby wrote:@gamesorry:
Perfect. A little easy this week, I guess :-)
Thanks :-) I think problem 3 is easier than before because the best result is not a ko. But still, good problems!
@gamesorry:
The competition at my work is two weeks ahead, and I think the next round might be a bit trickier, based on responses I got from participants there. I guess we'll see next week.

Posted: Fri Mar 03, 2017 3:42 am
by EdLee
2017 Round 3.1 (007)
Click Here To Show Diagram Code
[go]$$B :b5: tenuki, alive
$$------------------
$$ | . 1 2 4 . O . .
$$ | X O 3 . . O . .
$$ | . X X X O O . .
$$ | a O O O O . . .
$$ | b . . . . . . .
$$ | . . . . . . . .[/go]
Careful: Later, W has sente moves (a), (b).

2017 Round 3.2 (008)
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | 5 X O O O X . . .
$$ | 2 O 3 6 . X . X .
$$ | 7 1 4 O . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
Click Here To Show Diagram Code
[go]$$Wm8 (c), (d) miai: W seems dead this var
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | X X O O O X . . .
$$ | O O 1 O . X . X .
$$ | X X O O 2 . . . .
$$ | . c . d . . . . .
$$ ------------------[/go]
2017 Round 3.3 (009) :study:
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O , X X . . .
$$ | O . . . O X . X .
$$ | . O . 1 . O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O , X X . . .
$$ | O . 3 . O X . X .
$$ | . O 2 1 . O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
Click Here To Show Diagram Code
[go]$$B
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O 7 X X . . .
$$ | O 6 3 4 O X . X .
$$ | . O 2 1 5 O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
Click Here To Show Diagram Code
[go]$$B W dead
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O X X X . . .
$$ | O O . O O X . X .
$$ | . O O X X O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
Click Here To Show Diagram Code
[go]$$B W dead
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O , X X . . .
$$ | O . 5 2 O X . X .
$$ | . O 4 1 3 O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
Click Here To Show Diagram Code
[go]$$B W dead
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O , X X . . .
$$ | O . 2 4 O X . X .
$$ | . O 3 1 5 O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Re: L19 Go Problem Championship: Round 3

Posted: Fri Mar 03, 2017 8:44 am
by Kirby
@EdLee
Problem 1: Can you get better than ko?
Problem 2: Looks good!

Re: L19 Go Problem Championship: Round 3

Posted: Sat Mar 04, 2017 4:22 am
by mongus
Problem 1
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------
$$ | . 1 . . . O . .
$$ | X O 2 3 . O . .
$$ | . X X X O . O .
$$ | . O O O O . . .
$$ | . . . . . . . .[/go]
or

Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------
$$ | . 1 . . . O . .
$$ | X O 3 2 . O . .
$$ | . X X X O . O .
$$ | . O O O O . . .
$$ | . . . . . . . .[/go]



Problem 2
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | . X O O O X . . .
$$ | 4 O . 2 1 X . X .
$$ | . 3 5 O . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Re: L19 Go Problem Championship: Round 3

Posted: Sat Mar 04, 2017 11:16 pm
by Shaddy
Problem 1 (3 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ ----------------
$$ | . 1 . . . O . .
$$ | X O . . . O . .
$$ | . X X X O . O .
$$ | . O O O O . . .
$$ | . . . . . . . .[/go]

Problem 2 (6 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | 7 X O O O X . . .
$$ | 2 O 3 6 . X . X .
$$ | 5 1 4 O 9 . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]
8 @ 3


Problem 3 (9 points)
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | X X X X . . . . .
$$ | X O O 7 X X . . .
$$ | O 6 3 4 O X . X .
$$ | . O 2 1 5 O . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Re: L19 Go Problem Championship: Round 3

Posted: Sat Mar 04, 2017 11:21 pm
by Kirby
@mongus:
Problem 1: OK!

Problem 2: If white plays :w2: as below...?
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | . X O O O X . . .
$$ | . O . . 1 X . X .
$$ | . 2 . O . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Re: L19 Go Problem Championship: Round 3

Posted: Sat Mar 04, 2017 11:22 pm
by Kirby
@Shaddy:
Looks good.

Re: L19 Go Problem Championship: Round 3

Posted: Mon Mar 06, 2017 11:44 am
by mongus
@Kirby
Ah, hadn't thought about that. I think this works better.
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | . X O O O X . . .
$$ | 2 O . 4 3 X . X .
$$ | . 1 5 O 6 7 . . .
$$ | . . 9 . 8 . . . .
$$ ------------------[/go]

Re: L19 Go Problem Championship: Round 3

Posted: Tue Mar 07, 2017 3:08 pm
by Kirby
@mongus:
How about if white responds with :w4:, as below?
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . . .
$$ | . . . . . . . . .
$$ | . . . X . . . . .
$$ | . X X . X X . . .
$$ | . X O O O X . . .
$$ | 2 O . . 3 X . X .
$$ | . 1 4 O . . . . .
$$ | . . . . . . . . .
$$ ------------------[/go]

Re: L19 Go Problem Championship: Round 3

Posted: Thu Mar 09, 2017 11:52 pm
by Kirby
Solutions and an updated leaderboard are given below.

Problem 1


Problem 2


Problem 3


Leaderboard
  1. gamesorry - 54
  2. Shaddy - 36
  3. EdLee - 28
  4. Schachus - 23
  5. Lanrose - 16
  6. jeromie - 13
  7. dfan - 12
  8. mongus - 4
Round 4 will be released shortly!

Re: L19 Go Problem Championship: Round 3

Posted: Fri Mar 10, 2017 2:58 am
by mongus
Many thanks for doing these. Great explanation of the solutions.

I have a lot of catching up to do! :-)
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