It is currently Mon Feb 26, 2024 11:29 am

All times are UTC - 8 hours [ DST ]




Post new topic Reply to topic  [ 101 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6  Next
Author Message
Offline
 Post subject: Re: Tsumegos from real games
Post #81 Posted: Sat Feb 12, 2022 11:57 am 
Judan
User avatar

Posts: 5539
Location: Banbeck Vale
Liked others: 1102
Was liked: 1456
Rank: 1D AGA
GD Posts: 1512
Kaya handle: Test
Problem #30:
This looks like fun. It might work.
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | O X X X X X . 3 2 . . . . . O O O . . |
$$ | O O X O O X O O 1 . . . . O X O X X . |
$$ | X . O O O O X . . O . . . O X X . . . |
$$ | . O O . X O X . X . O . O X . . . . . |
$$ | . O X X . O X . . O . O . X . X X . . |
$$ | . X . . . O O X X X O . . . O . O X . |
$$ | . . . X X X X O . X X . X X X O . X . |
$$ | . X X X . X O O . O . . . X O O X . . |
$$ | . O O O X X X O . O . O O X O , O . . |
$$ | . . . . O O O X X X O X X O . O . . . |[/go]

The simple pull back does not work for white:
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . 7 . . . . . . . . . . . . . . . . . |
$$ | O X X X X X 5 3 2 . . . . . O O O . . |
$$ | O O X O O X O O 1 6 . . . O X O X X . |
$$ | X . O O O O X . 4 O . . . O X X . . . |
$$ | . O O . X O X . X . O . O X . . . . . |
$$ | . O X X . O X . . O . O . X . X X . . |
$$ | . X . . . O O X X X O . . . O . O X . |
$$ | . . . X X X X O . X X . X X X O . X . |
$$ | . X X X . X O O . O . . . X O O X . . |
$$ | . O O O X X X O . O . O O X O , O . . |
$$ | . . . . O O O X X X O X X O . O . . . |[/go]

So maybe white tries the counter attack, but leaves the aji at J17
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . 8 . . . . . . . . . . . . . . . . . |
$$ | O X X X X X 5 3 2 0 . . . . O O O . . |
$$ | O O X O O X O O 1 9 . . . O X O X X . |
$$ | X . O O O O X 6 4 O . . . O X X . . . |
$$ | . O O . X O X 7 X . O . O X . . . . . |
$$ | . O X X . O X . . O . O . X . X X . . |
$$ | . X . . . O O X X X O . . . O . O X . |
$$ | . . . X X X X O . X X . X X X O . X . |
$$ | . X X X . X O O . O . . . X O O X . . |
$$ | . O O O X X X O . O . O O X O , O . . |
$$ | . . . . O O O X X X O X X O . O . . . |[/go]


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


Now it is two kos. I'm not really sure how this ends.

_________________
Help make L19 more organized. Make an index: https://lifein19x19.com/viewtopic.php?f=14&t=5207

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #82 Posted: Sat Feb 12, 2022 12:11 pm 
Lives in sente

Posts: 863
Liked others: 22
Was liked: 166
Rank: panda 5 dan
IGS: kvasir
jlt wrote:
Katago sees this:


It is a nice one. It is a hard one, at least I think so.

Do you have the answer to this, white is threatening to make an eye so I assume :b5: onward.

Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . 3 . 8 . 7 6 9 . . . . . . . . . . . |
$$ | O X X X X X 1 2 0 . . . . . O O O . . |
$$ | O O X O O X O O . . . . . O X O X X . |
$$ | X . O O O O X . . O . . . O X X . . . |
$$ | . O O . X O X . X . O . O X . . . . . |
$$ | . O X X . O X . . O . O . X . X X . . |
$$ | 4 X . . . O O X X X O . . . O . O X . |
$$ | . 5 . X X X X O . X X . X X X O . X . |
$$ | . X X X . X O O . O . . . X O O X . . |
$$ | . O O O X X X O . O . O O X O , O . . |
$$ | . . . . O O O X X X O X X O . O . . . |[/go]

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #83 Posted: Sat Feb 12, 2022 12:19 pm 
Gosei
User avatar

Posts: 1736
Liked others: 171
Was liked: 485
Why not :b5: at A12 ?

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #84 Posted: Sat Feb 12, 2022 12:42 pm 
Gosei
User avatar

Posts: 1736
Liked others: 171
Was liked: 485
Actually if White makes the exchange a-b first then Black does have to pull back at :b5:

Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . 3 . 8 . 7 6 9 . . . . . . . . . . . |
$$ | O X X X X X 1 2 0 . . . . . O O O . . |
$$ | O O X O O X O O . . . . . O X O X X . |
$$ | X . O O O O X . . O . . . O X X . . . |
$$ | . O O . X O X . X . O . O X . . . . . |
$$ | . O X X . O X . . O . O . X . X X . . |
$$ | 4 X a b . O O X X X O . . . O . O X . |
$$ | . 5 . X X X X O . X X . X X X O . X . |
$$ | . X X X . X O O . O . . . X O O X . . |
$$ | . O O O X X X O . O . O O X O , O . . |
$$ | . . . . O O O X X X O X X O . O . . . |[/go]


This might finish with a seki by double ko (with Black taking sente)? Not absolutely sure.

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #85 Posted: Sat Feb 12, 2022 12:49 pm 
Lives in sente

Posts: 863
Liked others: 22
Was liked: 166
Rank: panda 5 dan
IGS: kvasir
Yeah getting the 1st line hane.

Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . 3 . 0 . 9 8 . . . . . . . . . . . . |
$$ | O X X X X X 1 2 . . . . . . O O O . . |
$$ | O O X O O X O O . . . . . O X O X X . |
$$ | X . O O O O X . . O . . . O X X . . . |
$$ | . O O . X O X . X . O . O X . . . . . |
$$ | . O X X . O X . . O . O . X . X X . . |
$$ | 6 X 4 5 . O O X X X O . . . O . O X . |
$$ | . 7 . X X X X O . X X . X X X O . X . |
$$ | . X X X . X O O . O . . . X O O X . . |
$$ | . O O O X X X O . O . O O X O , O . . |
$$ | . . . . O O O X X X O X X O . O . . . |[/go]


Now black has the hane-capture and this very botty-clamp. I have lost a few capturing races to bots when they pull something like this but I am sort of lost.

Click Here To Show Diagram Code
[go]$$Bcm11
$$ ---------------------------------------
$$ | . X . O . X O 3 . 5 . . . . . . . . . |
$$ | O X X X X X X O 1 4 . . . . O O O . . |
$$ | O O X O O X O O 2 . . . . O X O X X . |
$$ | X . O O O O X . . O . . . O X X . . . |
$$ | . O O . X O X . X . O . O X . . . . . |
$$ | . O X X . O X . . O . O . X . X X . . |
$$ | O X O X . O O X X X O . . . O . O X . |
$$ | . X . X X X X O . X X . X X X O . X . |
$$ | . X X X . X O O . O . . . X O O X . . |
$$ | . O O O X X X O . O . O O X O , O . . |
$$ | . . . . O O O X X X O X X O . O . . . |[/go]

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #86 Posted: Sat Feb 12, 2022 1:08 pm 
Lives in sente

Posts: 863
Liked others: 22
Was liked: 166
Rank: panda 5 dan
IGS: kvasir
Joaz Banbeck wrote:
Problem #30:


The cross cut might fail like this. At least I don't see what to do after white captures :b3:
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . 6 . . . . . . . . . . . |
$$ | O X X X X X 4 3 2 5 8 . . . O O O . . |
$$ | O O X O O X O O 1 . . . . O X O X X . |
$$ | X . O O O O X . 7 O . . . O X X . . . |
$$ | . O O . X O X . X . O . O X . . . . . |
$$ | . O X X . O X . . O . O . X . X X . . |
$$ | . X . . . O O X X X O . . . O . O X . |
$$ | . . . X X X X O . X X . X X X O . X . |
$$ | . X X X . X O O . O . . . X O O X . . |
$$ | . O O O X X X O . O . O O X O , O . . |
$$ | . . . . O O O X X X O X X O . O . . . |[/go]


Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . 6 . . . . . . . . . . . |
$$ | O X X X X X 4 3 2 5 . . . . O O O . . |
$$ | O O X O O X O O 1 7 . . . O X O X X . |
$$ | X . O O O O X 9 8 O . . . O X X . . . |
$$ | . O O . X O X . X . O . O X . . . . . |
$$ | . O X X . O X 0 . O . O . X . X X . . |
$$ | . X . . . O O X X X O . . . O . O X . |
$$ | . . . X X X X O . X X . X X X O . X . |
$$ | . X X X . X O O . O . . . X O O X . . |
$$ | . O O O X X X O . O . O O X O , O . . |
$$ | . . . . O O O X X X O X X O . O . . . |[/go]

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #87 Posted: Sat Feb 12, 2022 4:12 pm 
Judan
User avatar

Posts: 5539
Location: Banbeck Vale
Liked others: 1102
Was liked: 1456
Rank: 1D AGA
GD Posts: 1512
Kaya handle: Test
kvasir wrote:
Joaz Banbeck wrote:
Problem #30:


The cross cut might fail like this. At least I don't see what to do after white captures :b3:
...

Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . 6 . . . . . . . . . . . |
$$ | O X X X X X 4 3 2 5 . . . . O O O . . |
$$ | O O X O O X O O 1 7 . . . O X O X X . |
$$ | X . O O O O X 9 8 O . . . O X X . . . |
$$ | . O O . X O X . X . O . O X . . . . . |
$$ | . O X X . O X 0 . O . O . X . X X . . |
$$ | . X . . . O O X X X O . . . O . O X . |
$$ | . . . X X X X O . X X . X X X O . X . |
$$ | . X X X . X O O . O . . . X O O X . . |
$$ | . O O O X X X O . O . O O X O , O . . |
$$ | . . . . O O O X X X O X X O . O . . . |[/go]


Oops. I missed move 10.

_________________
Help make L19 more organized. Make an index: https://lifein19x19.com/viewtopic.php?f=14&t=5207

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #88 Posted: Mon Feb 14, 2022 2:57 am 
Lives in sente
User avatar

Posts: 912
Liked others: 389
Was liked: 160
Rank: German 2 dan
I thought this makes the corner alive, but the weakness at 'a' is a bit annoying. Maybe that's the price to pay, though.
Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | O X X X X X . 1 . . . . . . O O O . . |
$$ | O O X O O X O O . . . . . O X O X X . |
$$ | X . O O O O X . . O . . . O X X . . . |
$$ | . O O . X O X . X . O . O X . . . . . |
$$ | . O X X . O X a . O . O . X . X X . . |
$$ | . X . . . O O X X X O . . . O . O X . |
$$ | . . . X X X X O . X X . X X X O . X . |
$$ | . X X X . X O O . O . . . X O O X . . |
$$ | . O O O X X X O . O . O O X O , O . . |
$$ | . . . . O O O X X X O X X O . O . . . |[/go]

_________________
A good system naturally covers all corner cases without further effort.

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #89 Posted: Mon Mar 14, 2022 12:31 am 
Gosei
User avatar

Posts: 1736
Liked others: 171
Was liked: 485
Problem #31, White to play. Interesting life and death situation on the bottom right.

Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . O . . . . . . |
$$ | . . . . . . . . . . . O . O O O X . . |
$$ | . . . O . . . . . , . . O X X O X . . |
$$ | . . . . . . . . . . . . . X O X X . . |
$$ | . . O . . . . . . . . . . X O O . . . |
$$ | . . . . . . . . . . . . . X X O . X . |
$$ | . . . . . . . . . . . . X . X O . . . |
$$ | . . . . . . . . . X . . X X O . . . . |
$$ | . . . , . . . . . , . . O O O O O . . |
$$ | . . . . . . . . . . . . O X X O X . . |
$$ | . . . . . . . . . . . X O O X X X . . |
$$ | . . . . . . . . . . . X . O X O . . . |
$$ | . . . . . . . . . . . . . O O X X . . |
$$ | . . . . . . . . . . X O . . . . . . . |
$$ | . . X , . . . . X , X O . . O O O . . |
$$ | . . . . . X . X . . O O X X X X X . . |
$$ | . . . . . . . O O . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


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


Black's side group is dead.
The goal of the exchange :w3: :b4: is to avoid sequences such as

Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . O . . . . . . |
$$ | . . . . . . . . . . . O . O O O X . . |
$$ | . . . O . . . . . , . . O X X O X . . |
$$ | . . . . . . . . . . . . . X O X X . . |
$$ | . . O . . . . . . . . . . X O O . . . |
$$ | . . . . . . . . . . . . . X X O . X . |
$$ | . . . . . . . . . . . . X . X O . . . |
$$ | . . . . . . . . . X . . X X O . . . . |
$$ | . . . , . . . . . , . . O O O O O 5 . |
$$ | . . . . . . . . . . . . O X X O X 3 . |
$$ | . . . . . . . . . . . X O O X X X 4 7 |
$$ | . . . . . . . . . . . X . O X O 9 . 8 |
$$ | . . . . . . . . . . . . . O O X X 2 6 |
$$ | . . . . . . . . . . X O . . . . . 1 . |
$$ | . . X , . . . . X , X O . . O O O 0 . |
$$ | . . . . . X . X . . O O X X X X X a . |
$$ | . . . . . . . O O . . . . . . . . b . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


however White could have made the exchange a-b at anytime.

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #90 Posted: Thu May 05, 2022 2:43 am 
Gosei
User avatar

Posts: 1736
Liked others: 171
Was liked: 485
Problem #32, Black to play.

Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . X . . . . . . . . . . . . |
$$ | . . X X X . . O O . . . X O X . . . . |
$$ | . X . X O X X O X . O X X X O O O . . |
$$ | . . X O O O O X O O . O . . X X X O . |
$$ | . . O . . . . X O . O . . X . . . . . |
$$ | . . O . . . O X X O . O O O O . . . . |
$$ | . . . . O . O X X X O X X O . . . . . |
$$ | . . X . . . . O . O . O X . . . X . . |
$$ | . . . . O . O . . O O O X . . . O X . |
$$ | . . . , . . . . . , O X . X . X X O . |
$$ | . . X X X . . . . O X . X . . . . O . |
$$ | . . O . . . . X . X . . . O O . O . X |
$$ | . . O X X . . . . . . . X X . O . O . |
$$ | . . . O . . . . . . . . . . . X O O . |
$$ | . . . . . . . . . . . . . . . X X O . |
$$ | . . . O . . O O X , . . . . . , . X . |
$$ | . . O . . O . X X . . . X . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Answer:

Click Here To Show Diagram Code
[go]$$Bc Answer
$$ ---------------------------------------
$$ | . . . . . . X . . . . . . . . . . . . |
$$ | . . X X X . . O O . . . X O X 1 . . . |
$$ | . X . X O X X O X . O X X X O O O . . |
$$ | . . X O O O O X O O . O . . X X X O . |
$$ | . . O . . . . X O . O . . X . . . . . |
$$ | . . O . . . O X X O . O O O O . . . . |
$$ | . . . . O . O X X X O X X O . . . . . |
$$ | . . X . . . . O . O . O X . . . X . . |
$$ | . . . . O . O . . O O O X . . . O X . |
$$ | . . . , . . . . . , O X . X . X X O . |
$$ | . . X X X . . . . O X . X . . . . O . |
$$ | . . O . . . . X . X . . . O O . O . X |
$$ | . . O X X . . . . . . . X X . O . O . |
$$ | . . . O . . . . . . . . . . . X O O . |
$$ | . . . . . . . . . . . . . . . X X O . |
$$ | . . . O . . O O X , . . . . . , . X . |
$$ | . . O . . O . X X . . . X . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


In the game I played
S18


My opponent didn't manage to punish

Click Here To Show Diagram Code
[go]$$Bc Wrong move
$$ ---------------------------------------
$$ | . . . . . . X . . . . . . . . 8 . 7 . |
$$ | . . X X X . . O O . . . X O X 5 6 1 4 |
$$ | . X . X O X X O X . O X X X O O O 2 . |
$$ | . . X O O O O X O O . O . . X X X O . |
$$ | . . O . . . . X O . O . . X . . . 3 . |
$$ | . . O . . . O X X O . O O O O . . . . |
$$ | . . . . O . O X X X O X X O . . . . . |
$$ | . . X . . . . O . O . O X . . . X . . |
$$ | . . . . O . O . . O O O X . . . O X . |
$$ | . . . , . . . . . , O X . X . X X O . |
$$ | . . X X X . . . . O X . X . . . . O . |
$$ | . . O . . . . X . X . . . O O . O . X |
$$ | . . O X X . . . . . . . X X . O . O . |
$$ | . . . O . . . . . . . . . . . X O O . |
$$ | . . . . . . . . . . . . . . . X X O . |
$$ | . . . O . . O O X , . . . . . , . X . |
$$ | . . O . . O . X X . . . X . . X . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]



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

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #91 Posted: Mon Aug 15, 2022 3:39 am 
Gosei
User avatar

Posts: 1736
Liked others: 171
Was liked: 485
Problem #33, Black to play. This one was DDK level, how could I miss it?

Click Here To Show Diagram Code
[go]$$Bc
$$ . . . . . . . . . |
$$ . . . . . O . . . |
$$ . . . . X O O O . |
$$ . . . O O X O X . |
$$ X . O . X X X . X |
$$ . X O . X . X . . |
$$ X O O O . X W . . |
$$ O X X O O O O . . |
$$ . X . X X X O . . |
$$ . . . . . . . . . |
$$ . . . . . . . . . |
$$ -------------------[/go]

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #92 Posted: Mon Aug 15, 2022 4:21 am 
Lives in gote

Posts: 570
Location: Adelaide, South Australia
Liked others: 206
Was liked: 259
Rank: Australian 2 dan
GD Posts: 200
I wouldn't say DDK level. I fell into the temptation to be too clever...

First attempt (wrong)
Click Here To Show Diagram Code
[go]$$Bc
$$ . . . . . . . . . . |
$$ . . . . . . O . . . |
$$ . . . . . X O O O . |
$$ . . . . O O X O X . |
$$ . X . O . X X X . X |
$$ . . X O . X . X 2 . |
$$ . X O O O 3 X O 1 5 |
$$ . O X X O O O O 4 . |
$$ . . X . X X X O . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ ---------------------[/go]


It's cute that :w4: doesn't capture :b1:. One of my favourite shapes. But...


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


Oops


Second attempt
Click Here To Show Diagram Code
[go]$$Bc
$$ . . . . . . . . . . |
$$ . . . . . . O . . . |
$$ . . . . . X O O O . |
$$ . . . . O O X O X . |
$$ . X . O . X X X . X |
$$ . . X O . X . X 1 . |
$$ . X O O O a X O b . |
$$ . O X X O O O O . . |
$$ . . X . X X X O . . |
$$ . . . . . . . . . . |
$$ . . . . . . . . . . |
$$ ---------------------[/go]

Now 'a' and 'b' are miai.


This post by xela was liked by: jlt
Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #93 Posted: Wed Aug 24, 2022 6:15 am 
Gosei
User avatar

Posts: 1736
Liked others: 171
Was liked: 485
Problem #34, White to play

Click Here To Show Diagram Code
[go]$$Wc
$$ | . . . . . . X . . . . . . . . . . . . |
$$ | . . . . . . X O . . . . . . . . . . . |
$$ | . . . . . . X O . . . . . . . . . . . |
$$ | . . X X . . . O . . . . . . . . . . . |
$$ | . . O X . X X O . O O . . . . . . . . |
$$ | . . O , . O O X X X O . . O X X X . . |
$$ | . . . O . O X . . X X O . O X O O O . |
$$ | . . . . . O X . O . X . O . O X X X . |
$$ | . . . . . . X . . . . . . O . . . . . |
$$ ---------------------------------------[/go]


Answer
Click Here To Show Diagram Code
[go]$$Wc
$$ | . . . . . . X . . . . . . . . . . . . |
$$ | . . . . . . X O . . . . . . . . . . . |
$$ | . . . . . . X O . . . . . . . . . . . |
$$ | . . X X . . . O . . . . . . . . . . . |
$$ | . . O X . X X O . O O . . . . . . . . |
$$ | . . O , . O O X X X O . . O X X X . . |
$$ | . . . O . O X . . X X O . O X O O O . |
$$ | . . . . . O X 1 O . X . O . O X X X . |
$$ | . . . . . . X . . . . . . O . . . . . |
$$ ---------------------------------------[/go]

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #94 Posted: Fri Oct 28, 2022 2:20 am 
Gosei
User avatar

Posts: 1736
Liked others: 171
Was liked: 485
Problem #35. This is from a correspondence game on OGS, 1d vs 2d, I was Black. We both misread the following life and death problem. White to play.

Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . O O . . . . . . . . . . |
$$ | . . . . . . X . X O . X . O X X . . . |
$$ | . . . O X . . X X O . . . O O X . . . |
$$ | . . O , X . . . X X O O O X . X . . . |
$$ | . . . O O . . X X O . . X X . X . . . |
$$ | . . . . . . O O X . . . . . . O O . . |
$$ | . . . . . O . . O X . X . . . X . . . |
$$ | . . . . X O X . O X . . X . X . X . . |[/go]


In the game White played

M17

What is then the status of the white group, and what is the correct response for Black?

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


After the game move, White is dead.
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . O O . . . 3 2 . . . . . |
$$ | . . . . . . X . X O . X 4 O X X . . . |
$$ | . . . O X . . X X O . 1 . O O X . . . |
$$ | . . O , X . . . X X O O O X . X . . . |
$$ | . . . O O . . X X O . . X X . X . . . |
$$ | . . . . . . O O X . . . . . . O O . . |
$$ | . . . . . O . . O X . X . . . X . . . |[/go]


Click Here To Show Diagram Code
[go]$$Wc a and b are miai
$$ ---------------------------------------
$$ | . . . . . . . O O a 8 7 O b 5 . . . . |
$$ | . . . . . . X . X O 6 X X O X X . . . |
$$ | . . . O X . . X X O . O . O O X . . . |
$$ | . . O , X . . . X X O O O X . X . . . |
$$ | . . . O O . . X X O . . X X . X . . . |
$$ | . . . . . . O O X . . . . . . O O . . |
$$ | . . . . . O . . O X . X . . . X . . . |[/go]

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #95 Posted: Sat Aug 26, 2023 2:09 am 
Gosei
User avatar

Posts: 1736
Liked others: 171
Was liked: 485
Problem #36, Black to play.

Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ | . . . . . O . X . . O . X O . . O . . |
$$ | . . . X . . . X O . . . X O O . . O . |
$$ | . . . X O . O X . . O . . O . O O . . |
$$ | . . . X X X X X . X O . O . . . O X . |
$$ | . . . , O O O O X X X X X X X X X O O |
$$ | . . . . . X X O O X O O X O O . X X O |
$$ | . . . . O X O O X O O X O . O O O O O |
$$ | . . O . . O X O X O . X X O O X X O . |
$$ | . . . . . . . . X O . . X O X X O O . |
$$ | . . . . . X X X X O . W X O X O O X X |
$$ | . . O O . X O O X O . O X X X O . X . |
$$ | . X X O . X O O O . O . . . X X O O X |
$$ | . . . X X . X O . X O . X . . . X X . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


This post by jlt was liked by: xela
Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #96 Posted: Sat Aug 26, 2023 1:58 pm 
Lives in sente

Posts: 863
Liked others: 22
Was liked: 166
Rank: panda 5 dan
IGS: kvasir
Like this?
Click Here To Show Diagram Code
[go]$$Bc
$$ | . . . . . O . X . . O . X O . . O . . |
$$ | . . . X . . . X O . . . X O O . . O . |
$$ | . . . X O . O X . . O . . O . O O . . |
$$ | . . . X X X X X . X O . O . . . O X . |
$$ | . . . , O O O O X X X X X X X X X O O |
$$ | . . . . . X X O O X O O X O O . X X O |
$$ | . . . . O X O O X O O X O . O O O O O |
$$ | . . O . . O X O X O . X X O O X X O . |
$$ | . . 6 5 . . . . X O . . X O X X O O . |
$$ | . . . . . X X X X O . W X O X O O X X |
$$ | . . O O . X O O X O . O X X X O . X . |
$$ | . X X O . X O O O . O . . . X X O O X |
$$ | . . . X X 4 X O . X O . X . . . X X . |
$$ | . . . . . 3 2 . 1 . . . . . . . . . . |
$$ ---------------------------------------[/go]


:b1: looks vital but can't connect with :b3:

Click Here To Show Diagram Code
[go]$$Bcm7
$$ | . . . . . O . X . . O . X O . . O . . |
$$ | . . . X . . . X O . . . X O O . . O . |
$$ | . . . X O . O X . . O . . O . O O . . |
$$ | . . . X X X X X . X O . O . . . O X . |
$$ | . . . , O O O O X X X X X X X X X O O |
$$ | . . . . . X X O O X O O X O O . X X O |
$$ | . . . . O X O O X O O X O . O O O O O |
$$ | . . O . . O X O X O . X X O O X X O . |
$$ | . . O X . . . . X O . . X O X X O O . |
$$ | . . 5 . . X X X X O . W X O X O O X X |
$$ | . . O O . X O O X O . O X X X O . X . |
$$ | . X X O . X O O O 3 O . . . X X O O X |
$$ | . . . X X 4 1 O . X O . X . . . X X . |
$$ | . . . . . X O 2 X . . . . . . . . . . |
$$ ---------------------------------------[/go]


White can also play a threat for :w8: but I think black can protect

Click Here To Show Diagram Code
[go]$$Wcm8
$$ | . . . . . O . X . . O . X O . . O . . |
$$ | . . . X . . . X O . . . X O O . . O . |
$$ | . . . X O . O X 1 . O . . O . O O . . |
$$ | . . . X X X X X 2 X O . O . . . O X . |
$$ | . . . , O O O O X X X X X X X X X O O |
$$ | . . . . . X X O O X O O X O O . X X O |
$$ | . . . . O X O O X O O X O . O O O O O |
$$ | . . O . . O X O X O . X X O O X X O . |
$$ | . . O X . . . . X O . . X O X X O O . |
$$ | . . 4 5 . X X X X O . O X O X O O X X |
$$ | . . O O . X O O X O . O X X X O . X . |
$$ | . X X O . X O O O 8 O . . . X X O O X |
$$ | . . . X X 3 6 O . X O . X . . . X X . |
$$ | . . . . . X O 7 X . . . . . . . . . . |
$$ ---------------------------------------[/go]


Click Here To Show Diagram Code
[go]$$Wcm16
$$ | . . . . . O . X . . O . X O . . O . . |
$$ | . . . X . . . X O . . . X O O . . O . |
$$ | . . . X O . O X O . O . . O . O O . . |
$$ | . . . X X X X X X X O . O . . . O X . |
$$ | . . . , O O O O X X X X X X X X X O O |
$$ | . . 5 . . X X O O X O O X O O . X X O |
$$ | . . . . O X O O X O O X O . O O O O O |
$$ | . . O . . O X O X O . X X O O X X O . |
$$ | . . O X 2 . . . X O . . X O X X O O . |
$$ | . 4 X O . X X X X O . O X O X O O X X |
$$ | . . O O . X O O X O . O X X X O . X . |
$$ | . X X O . X O O O X O . . . X X O O X |
$$ | . . . X X 1 . O . X O . X . . . X X . |
$$ | . . . . 3 X O O X . . . . . . . . . . |
$$ ---------------------------------------[/go]


This post by kvasir was liked by: jlt
Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #97 Posted: Sun Aug 27, 2023 1:02 am 
Gosei
User avatar

Posts: 1736
Liked others: 171
Was liked: 485
I didn't show the whole board so there is not enough information to determine who wins the ko. Anyway what I missed in the game was that I could get a ko.

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #98 Posted: Tue Oct 03, 2023 12:37 pm 
Gosei
User avatar

Posts: 1736
Liked others: 171
Was liked: 485
Problem #37, White to play. Black has just invaded the corner on the top left, what can White do?

Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . O X . . X O O O O . . |
$$ | . . X O . . O . O X . X . O X O X X . |
$$ | . . X O . O . . X X O . . O X X . . . |
$$ | . . . . . X X . . X O . . . . . . . . |
$$ | . . O . . . . . . X O . . O . . X . . |
$$ | . . . . O O X . . X O . . O X . . . . |
$$ | . . . . X O X . . . O . . . X . . . . |
$$ | . . . O O X O X . . . . . . . . . . . |
$$ | . . O O X X . . . , . . . . . , . . . |
$$ | . . O X . X . . . . . . . . X . . . . |
$$ | . . O X . . . O . . . . . . . . X . . |
$$ | . . X . . O O X X . X O . . . . . . . |
$$ | . . X . X O . O X . X O . O . . . X . |
$$ | . . . . X O . O . O X X O . . X X O . |
$$ | . . . X . O . . . , . X X O O , O O . |
$$ | . . . . X O O O O . X . . X O O . . . |
$$ | . . . . X X O X O X . . . X O . . . . |
$$ | . . . . . . X . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Possible variation:

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

Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #99 Posted: Wed Dec 27, 2023 10:03 am 
Gosei
User avatar

Posts: 1736
Liked others: 171
Was liked: 485
Problem #38, White to play.

Click Here To Show Diagram Code
[go]$$Wc White to play
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . . . . . . O . O X X . . . |
$$ | . . X O . O . . . O O X . O O X . . . |
$$ | . . X O . O . . O O X X . . . X . . . |
$$ | . X X O . X O O X O . . . O . . . . . |
$$ | . X O O . . X O X O X . X O . . . . . |
$$ | . O . O . X . X X X . . X O X X X . . |
$$ | . . O . . . . . . . X . X O O O . . . |
$$ | . . . O X X X O O O O X X X . . . . . |
$$ | . . X X O O O O X X O O O . . , . . . |
$$ | . . . . X . . O O X X O . . . . . . . |
$$ | . . X . . X O O X X . X O O O . . . . |
$$ | . O X . . . O X . X X X . O X . . . . |
$$ | . O X O X . O . X . . X . O X . . . . |
$$ | . . O X X . . O O X . . . O X . . . . |
$$ | . . O X O . . O X , . X . O X , X . . |
$$ | . O X O O O O X X . . . . O X . . . . |
$$ | . . . . . . X . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


This post by jlt was liked by: xela
Top
 Profile  
 
Offline
 Post subject: Re: Tsumegos from real games
Post #100 Posted: Thu Dec 28, 2023 9:11 am 
Lives in sente

Posts: 863
Liked others: 22
Was liked: 166
Rank: panda 5 dan
IGS: kvasir
Like this?

Click Here To Show Diagram Code
[go]$$Wc Black looks dead and triangle weakness doesn't go anywhere, right?
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . . . . . . O . O X X . . . |
$$ | . . X O . O . . . O O X . O O X . . . |
$$ | . . X O . O . . O O X X . T . X . . . |
$$ | . X X O . X O O X O . . . O . . . . . |
$$ | . X O O . . X O X O X . X O . . . . . |
$$ | . O . O . X . X X X . . X O X X X . . |
$$ | . . O . 3 . 2 1 . . X . X O O O . . . |
$$ | . . . O X X X O O O O X X X . . . . . |
$$ | . . X X O O O O X X O O O . 5 4 . . . |
$$ | . . . . X . . O O X X O . . . . . . . |
$$ | . . X . . X O O X X . X O O O . . . . |
$$ | . O X . . . O X . X X X . O X . . . . |
$$ | . O X O X . O . X . . X . O X . . . . |
$$ | . . O X X . . O O X . . . O X . . . . |
$$ | . . O X O . . O X , . X . O X , X . . |
$$ | . O X O O O O X X . . . . O X . . . . |
$$ | . . . . . . X . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Click Here To Show Diagram Code
[go]$$Bc There is still only one eye if black goes for eyes.
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X X O . . . . . . O . O X X . . . |
$$ | . . X O . O . . . O O X . O O X . . . |
$$ | . . X O . O . . O O X X . . . X . . . |
$$ | . X X O . X O O X O 4 2 3 O . . . . . |
$$ | . X O O . . X O X O X 5 X O . . . . . |
$$ | . O . O . X . X X X . 1 X O X X X . . |
$$ | . . O . O . X O . 6 X . X O O O . . . |
$$ | . . . O X X X O O O O X X X . . . . . |
$$ | . . X X O O O O X X O O O . O X . . . |
$$ | . . . . X . . O O X X O . . . . . . . |
$$ | . . X . . X O O X X . X O O O . . . . |
$$ | . O X . . . O X . X X X . O X . . . . |
$$ | . O X O X . O . X . . X . O X . . . . |
$$ | . . O X X . . O O X . . . O X . . . . |
$$ | . . O X O . . O X , . X . O X , X . . |
$$ | . O X O O O O X X . . . . O X . . . . |
$$ | . . . . . . X . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


This post by kvasir was liked by 2 people: jlt, xela
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 101 posts ]  Go to page Previous  1, 2, 3, 4, 5, 6  Next

All times are UTC - 8 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 1 guest


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group