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 Post subject: L19 Go Problem Championship: Round 10
Post #1 Posted: Mon Apr 24, 2017 8:46 pm 
Judan

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Welcome to Round 10 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]$$Bc
$$ ------------------
$$ | . O . . . . O X .
$$ | O O . . O O O X .
$$ | X X O O X X X X .
$$ | . . X X . . . . .
$$ | . X . . . . . . .
$$ | . . . . . . . . .[/go]


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


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


Have fun! :salute:

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Post #2 Posted: Mon Apr 24, 2017 11:55 pm 
Judan
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W dies with 1 ko threat ( tiger's mouth => solid connect :bc: ) :)
Click Here To Show Diagram Code
[go]$$B
$$ -------------------
$$ | . O . 3 . . O X .
$$ | O O 2 1 O O O X .
$$ | X X O O X X X X .
$$ | . B X X . . . . .
$$ | . . . . . . . . .[/go]
:study:
Click Here To Show Diagram Code
[go]$$B
$$ --------------------
$$ . . O . . . 1 . . |
$$ . X X O . . O X X |
$$ . . . O . . O O X |
$$ . X X O . X O X . |
$$ . . . O O O X . . |
$$ . . X X X X . X . |
$$ . . . . . . . . . |[/go]

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 Post subject: Re:
Post #3 Posted: Tue Apr 25, 2017 12:36 am 
Lives in gote
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@ EdLee:

EdLee wrote:
W dies with 1 ko threat ( tiger's mouth => solid connect :bc: ) :)
Click Here To Show Diagram Code
[go]$$B
$$ -------------------
$$ | . O . 3 . . O X .
$$ | O O 2 1 O O O X .
$$ | X X O O X X X X .
$$ | . B X X . . . . .
$$ | . . . . . . . . .[/go]


Even here, White has three ko threats.

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


Click Here To Show Diagram Code
[go]$$B
$$ -------------------
$$ | 7 O 4 O 5 . O X .
$$ | O O X X O O O X .
$$ | X X . 6 X X X X .
$$ | . X X X . . . . .
$$ | . . . . . . . . .[/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 #4 Posted: Tue Apr 25, 2017 3:17 am 
Judan
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Cassandra:
Thanks.

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 Post subject: Re: L19 Go Problem Championship: Round 10
Post #5 Posted: Tue Apr 25, 2017 7:14 am 
Judan

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@EdLee:
Problem 1 looks good :-)

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 Post subject: Re: L19 Go Problem Championship: Round 10
Post #6 Posted: Fri Apr 28, 2017 9:11 pm 
Lives with ko

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1. Golden Chicken Standing on One Leg ("金鸡独立")
Click Here To Show Diagram Code
[go]$$Bc
$$ ------------------
$$ | . O . 3 . . O X .
$$ | O O 2 1 O O O X .
$$ | X X O O X X X X .
$$ | . . X X . . . . .
$$ | . X . . . . . . .
$$ | . . . . . . . . .[/go]


2.
The first intuition is
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------------
$$ . . O . . . . . . |
$$ . X X O . 1 O X X |
$$ . . . O . . O O X |
$$ . X X O . X O X . |
$$ . . . O O O X . . |
$$ . . X X X X . X . |
$$ . . . . . . . . . |[/go]


However, W can resist at :4 and then make a ko:
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------------
$$ . . O . 0 7 3 6 9 |
$$ . X X O 5 1 O X X |
$$ . . . O 8 2 O O X |
$$ . X X O 4 X O X . |
$$ . . . O O O X . . |
$$ . . X X X X . X . |
$$ . . . . . . . . . |[/go]


So B should destroy W's eye shape first:
Click Here To Show Diagram Code
[go]$$Bc
$$ --------------------
$$ . . O . 4 . 3 . . |
$$ . X X O . 2 O X X |
$$ . . . O 5 1 O O X |
$$ . X X O . X O X . |
$$ . . . O O O X . . |
$$ . . X X X X . X . |
$$ . . . . . . . . . |[/go]

3.
The intuition is a ko:
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . X X X X . . .
$$ | X O . , . X . .
$$ | . O . O . X . .
$$ | . O 1 . O X X .
$$ | 4 3 2 5 . O X .
$$ ----------------[/go]


Variation:
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . X X X X . . .
$$ | X O . , . X . .
$$ | 6 O 7 O . X . .
$$ | 5 O 1 . O X X .
$$ | . 3 2 4 . O X .
$$ ----------------[/go]

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 Post subject: Re: L19 Go Problem Championship: Round 10
Post #7 Posted: Sun Apr 30, 2017 10:12 pm 
Judan

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@gamesorry:
Problems 1 and 2 look good.

For Problem 3, what about this?

Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . X X X X . . .
$$ | X O . , . X . .
$$ | . O . O . X . .
$$ | . O 1 6 O X X .
$$ | 4 3 2 5 . O X .
$$ ----------------[/go]


For example:
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . . . .
$$ | . X X X X . . .
$$ | X O . , . X . .
$$ | . O 8 O . X . .
$$ | . O 1 6 O X X .
$$ | 4 7 C 5 . O X .
$$ ----------------[/go]

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Discipline is remembering what you want. -David Campbell


This post by Kirby was liked by: gamesorry
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 Post subject: Re: L19 Go Problem Championship: Round 10
Post #8 Posted: Sun Apr 30, 2017 10:16 pm 
Judan

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Liked others: 1359
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Solutions and updated leader board are given below.

Problem 1


Problem 2


Problem 3


Leaderboard
  1. gamesorry - 120
  2. EdLee - 75
  3. dfan - 70
  4. Schachus - 68
  5. Shaddy - 49
  6. hyperpape - 26
  7. mongus - 19
  8. Lanrose - 16
  9. jeromie - 13

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