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L19 Go Problem Championship: Round 10
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Author:  Kirby [ Mon Apr 24, 2017 8:46 pm ]
Post subject:  L19 Go Problem Championship: Round 10
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:
Author:  EdLee [ Mon Apr 24, 2017 11:55 pm ]
Post subject: 
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]
Author:  Cassandra [ Tue Apr 25, 2017 12:36 am ]
Post subject:  Re:
@ 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 . . . . .
$$ | . . . . . . . . .[/go]
Author:  EdLee [ Tue Apr 25, 2017 3:17 am ]
Post subject: 
Cassandra:
Thanks.
Author:  Kirby [ Tue Apr 25, 2017 7:14 am ]
Post subject:  Re: L19 Go Problem Championship: Round 10
@EdLee:
Problem 1 looks good :-)
Author:  gamesorry [ Fri Apr 28, 2017 9:11 pm ]
Post subject:  Re: L19 Go Problem Championship: Round 10
1. Golden Chicken Standing on One Leg ("金鸡独立")
Click Here To Show Diagram Code
[go]$$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]
Author:  Kirby [ Sun Apr 30, 2017 10:12 pm ]
Post subject:  Re: L19 Go Problem Championship: Round 10
@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]
Author:  Kirby [ Sun Apr 30, 2017 10:16 pm ]
Post subject:  Re: L19 Go Problem Championship: Round 10
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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