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Offline macelee
 Post subject: Go problem for 2015 new year
Post #1 Posted: Wed Dec 31, 2014 7:11 am 
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Posts: 928
Location: UK
Liked others: 72
Was liked: 480
Rank: 5 dan
KGS: macelee
A tesuji problem from a professional game I just processed. Black ignored the ko threat :w2:. So he must have a plan for his central group. Note the group is separated because the marked stones cannot be saved. This problem requires some reading but is not too difficult.

Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . X . O . O . . . . . |
$$ | . . . . . . . . X . X X O O O . . . . |
$$ | . . X X . . . O X . X X X O X . O . . |
$$ | . . O O . . . . X X O X O X . X O . . |
$$ | . . . . . . . X . . O O O . . . X . . |
$$ | . . . . . . . . . X O X X X X X O . . |
$$ | . . . . . . . . . O X O O O . X O X . |
$$ | . . . . . . . . X X X . . . . O X . X |
$$ | . O O X . . . . X O O . O O . O X X . |
$$ | . X X X . . . . . X O . O X X X O O . |
$$ | . O X 3 X O . . . . . . X . . 2 X O . |
$$ | . O O 1 O . . . . . . . X O X 4 X O . |
$$ | . . X O . . . . . . . O O X X X O . . |
$$ | . . . . . . . . . O O O X O X . O . . |
$$ | . . . . . . . . O O X X X O X O . . . |
$$ | . . . O . O X X O X . . . O . # O . . |
$$ | . . . . . X O O X . X X . O . # O . . |
$$ | . . . . O O O X . X . . X O # O O . . |
$$ | . . . . . O X X . O X . X . . . . . . |
$$ +---------------------------------------+[/go]
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Offline Elom
 Post subject: Re: Go problem for 2015 new year
Post #2 Posted: Wed Dec 31, 2014 10:20 am 
Lives in sente

Posts: 827
Location: UK
Liked others: 568
Was liked: 84
Rank: OGS 9kyu
Universal go server handle: WindnWater, Elom
Hey! No peeking. Think about shortage of liberties.

Nice and easy.
Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . X . O . O . . . . . |
$$ | . . . . . . . . X . X X O O O . . . . |
$$ | . . X X . . . O X . X X X O X . O . . |
$$ | . . O O . . . . X X O X O X . X O . . |
$$ | . . . . . . . X . . O O O . . . X . . |
$$ | . . . . . . . . . X O X X X X X O . . |
$$ | . . . . . . . . . O X O O O 4 X O X . |
$$ | . . . . . . . . X X X . . 3 2 O X . X |
$$ | . O O X . . . . X O O . O O 1 O X X . |
$$ | . X X X . . . . . X O . O X X X O O . |
$$ | . O X X X O . . . 5 6 9 X . . O . O . |
$$ | . O O X O . . . . . 7 8 X O X O . O . |
$$ | . . X O . . . . . . . O O X X X O . . |
$$ | . . . . . . . . . O O O X O X . O . . |
$$ | . . . . . . . . O O X X X O X O . . . |
$$ | . . . O . O X X O X . . . O . # O . . |
$$ | . . . . . X O O X . X X . O . # O . . |
$$ | . . . . O O O X . X . . X O # O O . . |
$$ | . . . . . O X X . O X . X . . . . . . |
$$ +---------------------------------------+[/go]

From here, it's hard for white to stop black connecting. Even if white put's 7 in atari, black can play over 9 and it's over.

_________________
On Go proverbs:
"A fine Gotation is a diamond in the hand of a dan of wit and a pebble in the hand of a kyu" —Joseph Raux misquoted.
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Offline macelee
 Post subject: Re: Go problem for 2015 new year
Post #3 Posted: Wed Dec 31, 2014 12:28 pm 
Lives in sente

Posts: 928
Location: UK
Liked others: 72
Was liked: 480
Rank: 5 dan
KGS: macelee
To answer Elom:


What if I do this now? You can only follow up with 'a', saving some but not all stones.

Click Here To Show Diagram Code
[go]$$W
$$ +---------------------------------------+
$$ | . . . . . . . . . X . O . O . . . . . |
$$ | . . . . . . . . X . X X O O O . . . . |
$$ | . . X X . . . O X . X X X O X . O . . |
$$ | . . O O . . . . X X O X O X . X O . . |
$$ | . . . . . . . X . . O O O . . . X . . |
$$ | . . . . . . . . . X O X X X X X O . . |
$$ | . . . . . . . . . O X O O O O X O X . |
$$ | . . . . . . . . X X X . . X O O X . X |
$$ | . O O X . . . . X O O a O O X O X X . |
$$ | . X X X . . . . . X O . O X X X O O . |
$$ | . O X X X O . . . X O X X . 1 O . O . |
$$ | . O O X O . . . . . X O X O X O . O . |
$$ | . . X O . . . . . . . O O X X X O . . |
$$ | . . . . . . . . . O O O X O X . O . . |
$$ | . . . . . . . . O O X X X O X O . . . |
$$ | . . . O . O X X O X . . . O . # O . . |
$$ | . . . . . X O O X . X X . O . # O . . |
$$ | . . . . O O O X . X . . X O # O O . . |
$$ | . . . . . O X X . O X . X . . . . . . |
$$ +---------------------------------------+[/go]
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Offline ez4u
 Post subject: Re: Go problem for 2015 new year
Post #4 Posted: Thu Jan 01, 2015 4:39 am 
Oza
User avatar

Posts: 2414
Location: Tokyo, Japan
Liked others: 2350
Was liked: 1332
Rank: Jp 6 dan
KGS: ez4u
Elom wrote:
Hey! No peeking. Think about shortage of liberties.

Nice and easy.
Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . X . O . O . . . . . |
$$ | . . . . . . . . X . X X O O O . . . . |
$$ | . . X X . . . O X . X X X O X . O . . |
$$ | . . O O . . . . X X O X O X . X O . . |
$$ | . . . . . . . X . . O O O . . . X . . |
$$ | . . . . . . . . . X O X X X X X O . . |
$$ | . . . . . . . . . O X O O O 4 X O X . |
$$ | . . . . . . . . X X X . . 3 2 O X . X |
$$ | . O O X . . . . X O O . O O 1 O X X . |
$$ | . X X X . . . . . X O . O X X X O O . |
$$ | . O X X X O . . . 5 6 9 X . . O . O . |
$$ | . O O X O . . . . . 7 8 X O X O . O . |
$$ | . . X O . . . . . . . O O X X X O . . |
$$ | . . . . . . . . . O O O X O X . O . . |
$$ | . . . . . . . . O O X X X O X O . . . |
$$ | . . . O . O X X O X . . . O . # O . . |
$$ | . . . . . X O O X . X X . O . # O . . |
$$ | . . . . O O O X . X . . X O # O O . . |
$$ | . . . . . O X X . O X . X . . . . . . |
$$ +---------------------------------------+[/go]

From here, it's hard for white to stop black connecting. Even if white put's 7 in atari, black can play over 9 and it's over.

Elom has the right idea. Only the execution seems suspect.

After 4 I think Black just continues with the blunt 5 and 7 to create the maximum reduction in liberties. If White tries to atari out, there is no answer to 9. As far as I can see, all alternatives produce a similar result.
Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . X . O . O . . . . . |
$$ | . . . . . . . . X . X X O O O . . . . |
$$ | . . X X . . . O X . X X X O X . O . . |
$$ | . . O O . . . . X X O X O X . X O . . |
$$ | . . . . . . . X . . O O O . . . X . . |
$$ | . . . . . . . . . X O X X X X X O . . |
$$ | . . . . . . . . . O X O O O 4 X O X . |
$$ | . . . . . . . . X X X 5 6 3 2 O X . X |
$$ | . O O X . . . . X O O . O O 1 O X X . |
$$ | . X X X . . . . . X O 9 O X X X O O . |
$$ | . O X X X O . . . 8 7 . X . . O . O . |
$$ | . O O X O . . . . . . . X O X O . O . |
$$ | . . X O . . . . . . . O O X X X O . . |
$$ | . . . . . . . . . O O O X O X . O . . |
$$ | . . . . . . . . O O X X X O X O . . . |
$$ | . . . O . O X X O X . . . O . X O . . |
$$ | . . . . . X O O X . X X . O . X O . . |
$$ | . . . . O O O X . X . . X O X O O . . |
$$ | . . . . . O X X . O X . X . . . . . . |
$$ ---------------------------------------[/go]

_________________
Dave Sigaty
"Short-lived are both the praiser and the praised, and rememberer and the remembered..."
- Marcus Aurelius; Meditations, VIII 21
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Offline Elom
 Post subject: Re: Go problem for 2015 new year
Post #5 Posted: Thu Jan 01, 2015 7:52 am 
Lives in sente

Posts: 827
Location: UK
Liked others: 568
Was liked: 84
Rank: OGS 9kyu
Universal go server handle: WindnWater, Elom
Elom wrote:
Hey! No peeking. Think about shortage of liberties.

Nice and easy.
Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . X . O . O . . . . . |
$$ | . . . . . . . . X . X X O O O . . . . |
$$ | . . X X . . . O X . X X X O X . O . . |
$$ | . . O O . . . . X X O X O X . X O . . |
$$ | . . . . . . . X . . O O O . . . X . . |
$$ | . . . . . . . . . X O X X X X X O . . |
$$ | . . . . . . . . . O X O O O 4 X O X . |
$$ | . . . . . . . . X X X . . 3 2 O X . X |
$$ | . O O X . . . . X O O . O O 1 O X X . |
$$ | . X X X . . . . . X O . O X X X O O . |
$$ | . O X X X O . . . 5 6 9 X . . O . O . |
$$ | . O O X O . . . . . 7 8 X O X O . O . |
$$ | . . X O . . . . . . . O O X X X O . . |
$$ | . . . . . . . . . O O O X O X . O . . |
$$ | . . . . . . . . O O X X X O X O . . . |
$$ | . . . O . O X X O X . . . O . # O . . |
$$ | . . . . . X O O X . X X . O . # O . . |
$$ | . . . . O O O X . X . . X O # O O . . |
$$ | . . . . . O X X . O X . X . . . . . . |
$$ +---------------------------------------+[/go]

From here, it's hard for white to stop black connecting. Even if white put's 7 in atari, black can play over 9 and it's over.


macelee wrote:
To answer Elom:


What if I do this now? You can only follow up with 'a', saving some but not all stones.

Click Here To Show Diagram Code
[go]$$W
$$ +---------------------------------------+
$$ | . . . . . . . . . X . O . O . . . . . |
$$ | . . . . . . . . X . X X O O O . . . . |
$$ | . . X X . . . O X . X X X O X . O . . |
$$ | . . O O . . . . X X O X O X . X O . . |
$$ | . . . . . . . X . . O O O . . . X . . |
$$ | . . . . . . . . . X O X X X X X O . . |
$$ | . . . . . . . . . O X O O O O X O X . |
$$ | . . . . . . . . X X X . . X O O X . X |
$$ | . O O X . . . . X O O a O O X O X X . |
$$ | . X X X . . . . . X O . O X X X O O . |
$$ | . O X X X O . . . X O X X . 1 O . O . |
$$ | . O O X O . . . . . X O X O X O . O . |
$$ | . . X O . . . . . . . O O X X X O . . |
$$ | . . . . . . . . . O O O X O X . O . . |
$$ | . . . . . . . . O O X X X O X O . . . |
$$ | . . . O . O X X O X . . . O . # O . . |
$$ | . . . . . X O O X . X X . O . # O . . |
$$ | . . . . O O O X . X . . X O # O O . . |
$$ | . . . . . O X X . O X . X . . . . . . |
$$ +---------------------------------------+[/go]


I can just imagine that happening in one of my games :)

Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . X . O . O . . . . . |
$$ | . . . . . . . . X . X X O O O . . . . |
$$ | . . X X . . . O X . X X X O X . O . . |
$$ | . . O O . . . . X X O X O X . X O . . |
$$ | . . . . . . . X . . O O O . . . X . . |
$$ | . . . . . . . . . X O X X X X X O . . |
$$ | . . . . . . . . . O X O O O 4 X O X . |
$$ | . . . . . . . . X X X . . 3 2 O X . X |
$$ | . O O X . . . . X O O . O O 1 O X X . |
$$ | . X X X . . . . . X O 9 O X X X O O . |
$$ | . O X X X O . . . 8 5 6 X . . O . O . |
$$ | . O O X O . . . . . . 7 X O X O . O . |
$$ | . . X O . . . . . . . O O X X X O . . |
$$ | . . . . . . . . . O O O X O X . O . . |
$$ | . . . . . . . . O O X X X O X O . . . |
$$ | . . . O . O X X O X . . . O . # O . . |
$$ | . . . . . X O O X . X X . O . # O . . |
$$ | . . . . O O O X . X . . X O # O O . . |
$$ | . . . . . O X X . O X . X . . . . . . |
$$ +---------------------------------------+[/go]


or--

Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . X . O . O . . . . . |
$$ | . . . . . . . . X . X X O O O . . . . |
$$ | . . X X . . . O X . X X X O X . O . . |
$$ | . . O O . . . . X X O X O X . X O . . |
$$ | . . . . . . . X . . O O O . . . X . . |
$$ | . . . . . . . . . X O X X X X X O . . |
$$ | . . . . . . . . . O X O O O 4 X O X . |
$$ | . . . . . . . . X X X . . 3 2 O X . X |
$$ | . O O X . . . . X O O . O O 1 O X X . |
$$ | . X X X . . . . . X O 7 O X X X O O . |
$$ | . O X X X O . . . 6 5 . X . . O . O . |
$$ | . O O X O . . . . . . . X O X O . O . |
$$ | . . X O . . . . . . . O O X X X O . . |
$$ | . . . . . . . . . O O O X O X . O . . |
$$ | . . . . . . . . O O X X X O X O . . . |
$$ | . . . O . O X X O X . . . O . # O . . |
$$ | . . . . . X O O X . X X . O . # O . . |
$$ | . . . . O O O X . X . . X O # O O . . |
$$ | . . . . . O X X . O X . X . . . . . . |
$$ +---------------------------------------+[/go]


so--

Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . X . O . O . . . . . |
$$ | . . . . . . . . X . X X O O O . . . . |
$$ | . . X X . . . O X . X X X O X . O . . |
$$ | . . O O . . . . X X O X O X . X O . . |
$$ | . . . . . . . X . . O O O . . . X . . |
$$ | . . . . . . . . . X O X X X X X O . . |
$$ | . . . . . . . . . O X O O O 4 X O X . |
$$ | . . . . . . . . X X X . . 3 2 O X . X |
$$ | . O O X . . . . X O O . O O 1 O X X . |
$$ | . X X X . . . . . X O . O X X X O O . |
$$ | . O X X X O . . . . 5 6 X . 8 O . O . |
$$ | . O O X O . . . . . . 7 X O X O . O . |
$$ | . . X O . . . . . . . O O X X X O . . |
$$ | . . . . . . . . . O O O X O X . O . . |
$$ | . . . . . . . . O O X X X O X O . . . |
$$ | . . . O . O X X O X . . . O . # O . . |
$$ | . . . . . X O O X . X X . O . # O . . |
$$ | . . . . O O O X . X . . X O # O O . . |
$$ | . . . . . O X X . O X . X . . . . . . |
$$ +---------------------------------------+[/go]


but--

Click Here To Show Diagram Code
[go]$$B
$$ +---------------------------------------+
$$ | . . . . . . . . . X . O . O . . . . . |
$$ | . . . . . . . . X . X X O O O . . . . |
$$ | . . X X . . . O X . X X X O X . O . . |
$$ | . . O O . . . . X X O X O X . X O . . |
$$ | . . . . . . . X . . O O O . . . X . . |
$$ | . . . . . . . . . X O X X X X X O . . |
$$ | . . . . . . . . . O X O O O O X O X . |
$$ | . . . . . . . . X X X . . X O O X . X |
$$ | . O O X . . . . X O O . O O X O X X . |
$$ | . X X X . . . . . X O . O X X X O O . |
$$ | . O X X X O . . . . X O X 1 O O . O . |
$$ | . O O X O . . . . . . X X O X O . O . |
$$ | . . X O . . . . . . . O O X X X O . . |
$$ | . . . . . . . . . O O O X O X . O . . |
$$ | . . . . . . . . O O X X X O X O . . . |
$$ | . . . O . O X X O X . . . O . # O . . |
$$ | . . . . . X O O X . X X . O . # O . . |
$$ | . . . . O O O X . X . . X O # O O . . |
$$ | . . . . . O X X . O X . X . . . . . . |
$$ +---------------------------------------+[/go]
If this is correct (unlikely), it's a nice tesuji :) now I'll check the next post.

_________________
On Go proverbs:
"A fine Gotation is a diamond in the hand of a dan of wit and a pebble in the hand of a kyu" —Joseph Raux misquoted.
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