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

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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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Offline EdLee
 Post subject:
Post #2 Posted: Mon Apr 24, 2017 11:55 pm 
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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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Offline Cassandra
 Post subject: Re:
Post #3 Posted: Tue Apr 25, 2017 12:36 am 
Lives in sente
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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: https://igohatsuyoron120.de/index.htm
Igo Hatsuyōron #120 (really solved by KataGo)
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Offline EdLee
 Post subject:
Post #4 Posted: Tue Apr 25, 2017 3:17 am 
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Cassandra:
Thanks.
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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 10
Post #5 Posted: Tue Apr 25, 2017 7:14 am 
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@EdLee:
Problem 1 looks good :-)

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Offline gamesorry
 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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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 10
Post #7 Posted: Sun Apr 30, 2017 10:12 pm 
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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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This post by Kirby was liked by: gamesorry
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Offline Kirby
 Post subject: Re: L19 Go Problem Championship: Round 10
Post #8 Posted: Sun Apr 30, 2017 10:16 pm 
Honinbo

Posts: 9550
Liked others: 1602
Was liked: 1712
KGS: Kirby
Tygem: 커비라고해
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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