L19 Go Problem Championship: Round 10

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Kirby
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L19 Go Problem Championship: Round 10

Post by Kirby »

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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EdLee
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Post by EdLee »

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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Cassandra
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Re:

Post by Cassandra »

@ 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]
The really most difficult Go problem ever: https://igohatsuyoron120.de/index.htm
Igo Hatsuyōron #120 (really solved by KataGo)
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EdLee
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Post by EdLee »

Cassandra:
Thanks.
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Kirby
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Re: L19 Go Problem Championship: Round 10

Post by Kirby »

@EdLee:
Problem 1 looks good :-)
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gamesorry
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Re: L19 Go Problem Championship: Round 10

Post by gamesorry »

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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Kirby
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Re: L19 Go Problem Championship: Round 10

Post by Kirby »

@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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Kirby
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Re: L19 Go Problem Championship: Round 10

Post by Kirby »

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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