It is currently Tue Oct 26, 2021 4:57 am

View unanswered posts | View active topics View unread posts | View new posts | View your posts


Board index » Improve Your Game » Study Group

All times are UTC - 8 hours [ DST ]



Post new topic Reply to topic  Page 3 of 4
  [ 66 posts ]  Go to page Previous  1, 2, 3, 4  Next
  Print view Previous topic | Next topic 
Author Message
Offline Harleqin
 Post subject: Re: Tsumegos from real games
Post #41 Posted: Fri Nov 20, 2020 2:19 pm 
Lives in sente
User avatar

Posts: 817
Liked others: 319
Was liked: 134
Rank: German 2 dan
Q18 seems to make miai.

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

This post by Harleqin was liked by: jlt
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #42 Posted: Wed Dec 09, 2020 7:45 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Problem #12, Black to play. It seems that Black can kill and that both players (1k Tygem) missed that during all the game.

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


Answer:

Click Here To Show Diagram Code
[go]$$Bc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . O . . . . . |
$$ | . . . , O . . . . , . . . . . X . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . X . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . . , . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . . . . . O . . . . . . . . . . . |
$$ | . . . . . . . O X . . . . . . . . . . |
$$ | . . O . . . . O X . . . . . . . . . . |
$$ | . O O . . . . O X . X X X . . . X . . |
$$ | . X X O O O O X X , O 1 O X . , . . . |
$$ | X . . X O X X O . O . 2 O O X X . . . |
$$ | . X X X X X . O . . 3 . . . . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #43 Posted: Fri Dec 11, 2020 10:48 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Problem #13: Black to play and kill the bottom group.

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


Answer:
Click Here To Show Diagram Code
[go]$$Bc Answer
$$ ---------------------------------------
$$ | . . . X . . . . . . . . . X O O . O . |
$$ | . . X O O O . . O X . . . X O . O O X |
$$ | . . X O . . O X O . X . . X X O O X . |
$$ | . . O X O O . O . , . . . X X X X . X |
$$ | . . X X . . . . . X O . O X O . . X . |
$$ | . . . X X X O . . . . O X O O . . . . |
$$ | . . X O O O X X X . O . X X . O X . . |
$$ | . X . X . X O X . O O X X . . O . O . |
$$ | . O X X X O O X X X O O X . . . O . . |
$$ | . . O O O O . O X X O . O X . , . . . |
$$ | . . . . . . . O O X X O O X . . . . . |
$$ | . . . . O X X X O O O . O X . . O . . |
$$ | . . O . . O . . X O O . O X . . O O . |
$$ | . . . . . O X . X X O O X . X X O X . |
$$ | . . . . . O X . . O X X X X . . X X . |
$$ | . . . O O X . . . O . . . . X X O O . |
$$ | . O O X X X . . X 1 O X X O . X . . . |
$$ | . . X . . . . . X O . O O . O X X . . |
$$ | . . . . . . . . O . . . . . . O . . . |
$$ ---------------------------------------[/go]
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #44 Posted: Mon Jan 11, 2021 1:35 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
This ridiculous position is from a blitz game.

Problem #14: Black to play. Which group should Black choose to kill and how?

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


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


"a" kills a bigger group than "b".
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #45 Posted: Sun Jan 17, 2021 9:35 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Problem #15: Black to play. What is the status of the lower right corner?

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


Click Here To Show Diagram Code
[go]$$Bc Ko
$$ | . X O X O X . X X . . . . . . X O O X |
$$ | . O O O X X . O X . X X O . O O X X . |
$$ | . . . . . . . O X O . . . . . . X X . |
$$ | . . . . X . X X O X X X X . O O O X . |
$$ | . . O O O . . . O O O O . X X X X O . |
$$ | . . X X O O O O . . . . . . . X O O . |
$$ | . . . . X X X O . . . . . . X O . 2 1 |
$$ | . . . . . . . . . . . . . . 3 . O . . |
$$ ---------------------------------------[/go]
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #46 Posted: Sat Jan 30, 2021 10:22 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Problem #16, Black to play.

I was white playing an H9 game and killed the upper left corner. However, Black could have lived. How?

Click Here To Show Diagram Code
[go]$$Bc Black to play
$$ ---------------------------------------
$$ | . . . . . . . . O O X . . . . . . . . |
$$ | . O O . X X O . O X X . . . . . . . . |
$$ | X X X . X O . O X . . . . . X O O . . |
$$ | . O O X X O . . . X . . . X . X X O . |
$$ | O . . O X O . O X . . . . . . . X O . |
$$ | . O . . O X . O X . . . . . . X X X O |
$$ | . O . O O X . O X X . . . . . . X O . |
$$ | O . O . O . . O X . . . . . . . X O . |
$$ | . O X O . O . . O O X X . X . . X O . |
$$ | . X . X . . . . . X O X X O . X O . . |
$$ | . . X . . O . . . . O . O O X X O . . |
$$ | . . . . . O . X X . . O . . X O . . . |
$$ | . . . . X O X . O O O X X . X O O . . |
$$ | . . X . X X O . O X X . . . . X O . . |
$$ | . . . . X O O . X . . . . . . X X O . |
$$ | . . X X . . . . . X . . . X . X O . . |
$$ | . . X O . O . . O X . . . . . X O . . |
$$ | X X O O . . . . O X . . . . X O O . . |
$$ | . O . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Top
 Profile  
 
Offline lightvector
 Post subject: Re: Tsumegos from real games
Post #47 Posted: Sat Jan 30, 2021 11:42 am 
Lives in gote

Posts: 684
Liked others: 109
Was liked: 833
Rank: maybe 2d
About problem 15 shape, one interesting thing to know, if we adjust the stones a little...

Click Here To Show Diagram Code
[go]$$Bc White status?
$$ | . . . , . . . . . , . . . O X X X X . |
$$ | . X X X . . O . . . . . . O O X X . . |
$$ | . X O X O X . X X . . . . . . X . X . |
$$ | . O O O X X . O X . X X O . O O X . . |
$$ | . . . . . . . O X O . . . . . . X . . |
$$ | . . . . X . X X O X X X X . O O X . . |
$$ | . . O O O . . . O O O O . X X X X . . |
$$ | . . X X O O O O . . . . . . . X O O . |
$$ | . . . . X X X O . . . . . . X O . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ ---------------------------------------[/go]


Now white is alive and there is no ko.

Click Here To Show Diagram Code
[go]$$Bc Exercise for the reader - white to live
$$ | . . . , . . . . . , . . . O X X X X . |
$$ | . X X X . . O . . . . . . O O X X . . |
$$ | . X O X O X . X X . . . . . . X . X . |
$$ | . O O O X X . O X . X X O . O O X . . |
$$ | . . . . . . . O X O . . . . . . X . . |
$$ | . . . . X . X X O X X X X . O O X . . |
$$ | . . O O O . . . O O O O . X X X X . . |
$$ | . . X X O O O O . . . . . . . X O O . |
$$ | . . . . X X X O . . . . . . X O . 2 1 |
$$ | . . . . . . . . . . . . . . 3 . O . . |
$$ ---------------------------------------[/go]


Although also it requires the marked spots to be free of black stones:

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


To also prevent this sequence:

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


Anyways, this means that the following push is very bad for white, because white's corner goes from alive to black being able to make a ko.

Click Here To Show Diagram Code
[go]$$Wc bad push
$$ | . . . , . . . . . , . . . O X X X X . |
$$ | . X X X . . O . . . . . . O O X X . . |
$$ | . X O X O X . X X . . . . . . X . X . |
$$ | . O O O X X . O X . X X O . O O X . . |
$$ | . . . . . . . O X O . . . . . . X . . |
$$ | . . . . X . X X O X X X X . O O X 2 . |
$$ | . . O O O . . . O O O O . X X X X 1 . |
$$ | . . X X O O O O . . . . . . . X O O . |
$$ | . . . . X X X O . . . . . . X O . . . |
$$ | . . . . . . . . . . . . . . . . O . . |
$$ ---------------------------------------[/go]

This post by lightvector was liked by: jlt
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #48 Posted: Sat Jan 30, 2021 3:44 pm 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
In fact you make me realize that Problem #15 is the tripod group with extra leg.

https://senseis.xmp.net/?TripodGroupWithExtraLeg

I had read this page before, but not carefully.
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #49 Posted: Mon Feb 01, 2021 12:32 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Answer to problem #16:

Click Here To Show Diagram Code
[go]$$Bc Answer
$$ -------------------------
$$ | . 8 9 . 3 2 1 . O O X .
$$ | 5 O O 6 X X O 4 O X X .
$$ | X X X 7 X O . O X . . .
$$ | . O O X X O . . . X . .
$$ | O . . O X O . O X . . .
$$ | . O . . O X . O X . . .[/go]
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #50 Posted: Sat Feb 06, 2021 2:24 pm 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Problem #17, White to play. What is the status of the black group Q7?

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


Answer ?

This seems to be a ko.

Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . X . . . . . . . . . . . . . . . . . |
$$ | O X O O . . . . . . . . . . . . . . . |
$$ | . O X O . . . . . . . O X X X . . . . |
$$ | O X X O . . . . X O . O X O . , X . . |
$$ | X X X O . . . O O . O X O O O X . X . |
$$ | . X O O . . . . . X . X X X O O X . . |
$$ | . . X . . . . . . . . X . X . O O . . |
$$ | . X . . . . . . X . X . X . X X O . . |
$$ | . . . . . . . . . . X X O O O O O . . |
$$ | . . O , . . . O . O X O O X . , . b . |
$$ | . . . . . . . . . . O O X . X . X . . |
$$ | . . . . . . . . . O O . O 1 2 . . a . |
$$ | . . . . . . . . . . X O . X . X X . . |
$$ | . . . O . . . . . . . . O . X . X O . |
$$ | . O O . . . . X X . . . . . 3 X O . O |
$$ | . X X O . . . O . X . O . O O O O O . |
$$ | . . X O . O . . . . X O . O X X X . . |
$$ | X . X X O . . . . . . X X X . . . . . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


a and b are miai.
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #51 Posted: Sun Apr 11, 2021 7:28 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
An easy one, that both players missed.

Problem#18, White to play in the lower left corner.

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


Wrong answer:

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


Correct answer:

Click Here To Show Diagram Code
[go]$$Wc Black is unconditionally dead
$$ | . . . . . . . . . . . . .
$$ | . . . . . . . O . . X . X
$$ | . . . . . . . . . O . . .
$$ | . X X X . . . O . . . . .
$$ | . . O X . X . X O . O O O
$$ | 1 O O , . . X . O O X X X
$$ | . X . O . O X O O X X O O
$$ | . . X 2 3 O O X X X . X X
$$ | . . . . . . . . . . X . .
$$ ---------------------------[/go]
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #52 Posted: Wed Apr 14, 2021 12:02 pm 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Problem#19: not complicated but not my first instinct. White to play.

Click Here To Show Diagram Code
[go]$$Wc White to play
$$---------------------
$$ . . . . . . . . . . |
$$ . X X O . . . . . . |
$$ . X O . O . X X X . |
$$ , X O . X . O X O . |
$$ . . O . . . O O . . |
$$ X . . . . . . O . . |
$$ . . . . . . O . O . |
$$ . . . . . . . O X . |
$$ . . . . . . . X . . |
$$ , . . . . . , . . . |
$$ . . . . . . . X . . |[/go]
Top
 Profile  
 
Offline Knotwilg
 Post subject: Re: Tsumegos from real games
Post #53 Posted: Thu Apr 15, 2021 2:20 am 
Gosei
User avatar

Posts: 1933
Location: Ghent, Belgium
Liked others: 292
Was liked: 874
Rank: KGS 2d OGS 1d Fox 4d
KGS: Artevelde
OGS: Knotwilg
Online playing schedule: UTC 18:00 - 22:00
Click Here To Show Diagram Code
[go]$$Wc White to play
$$---------------------
$$ . . . . . . 9 6 3 . |
$$ . X X O . 1 . 7 8 a |
$$ . X O . O . X X X . |
$$ , X O . X . O X O 4 |
$$ . . O . . . O O 2 b |
$$ X . . . . . . O . 5 |
$$ . . . . . . O . O . |
$$ . . . . . . . O X . |
$$ . . . . . . . X . . |
$$ , . . . . . , . . . |
$$ . . . . . . . X . . |[/go]

This post by Knotwilg was liked by: jlt
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #54 Posted: Tue Jun 01, 2021 7:59 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Problem #20: this one is easy but I hallucinated during the game. White to play.

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


Answer:

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


:w1: and :w3: may be interchanged.

Yes after several years of practice I still make confusions between real eyes and false eyes.
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #55 Posted: Thu Jun 03, 2021 2:37 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Problem #21: White to play.

Killing is not very hard but White needs to pay attention to something.

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


Answer:

R8. The point is that Black loses the following capturing race:

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


and then P7 is a connect-and-die.
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #56 Posted: Fri Jun 11, 2021 3:24 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Problem #22, White to play. Does White need to protect the corner?

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


Answer:

If White plays elsewhere then Black can kill by ko.

Click Here To Show Diagram Code
[go]$$Bc
$$ | X X X X . . O O X
$$ | 3 O O X X X O X X
$$ | 4 . O X O O X . X
$$ | 5 O 2 O O O X . X
$$ | . 1 . O X X X . .
$$ --------------------[/go]
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #57 Posted: Mon Jun 14, 2021 3:15 pm 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Position #23, Black to play. What is the status of the upper left corner?

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


Edit: coincidence, it's one of the daily problems on the app Tsumego Pro.

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


White takes the ko first but Black has a ko threat at "a", so both groups survive.
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #58 Posted: Mon Sep 20, 2021 8:18 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Position #24, White to play.

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


Answer:

Click Here To Show Diagram Code
[go]$$Wc Answer
$$ ---------------------------------------
$$ | . . X O O . . . . . . . . . . . . . . |
$$ | . . X X O . . . X X . . . . . X X O . |
$$ | . . . X O . O . . O X X X X X X O X . |
$$ | . . X , O . . O O , O O O O O O O O . |
$$ | . . . . X O X . . . . . . . . . O . . |
$$ | . . X . X O X X . . . . . . . . X X . |
$$ | . . . . X O O . . . X O O . 1 3 4 . 5 |
$$ | . O O O X . . O . X O O X X 2 X . X . |
$$ | . X X O X . . . . . . . . . . . X O . |
$$ | . X . X O O O O O , O O . X X X O . O |
$$ | . X . X O . X X X X X . O X O O O O . |
$$ | . X . X O . O O X . . . X O . . . . . |
$$ | . . X . . . O X . X . . X O . . . . . |
$$ | . . X X . . X X . . . . X O . . . . . |
$$ | . . O X . . . . . . . . . . . . . . . |
$$ | . . O , . . . . . , . . . . O O O O O |
$$ | . . . O . O . X . . O O O . O X X X O |
$$ | . . . . . . . . . . . X X X X . . . X |
$$ | . . . . . . . . . . . . . . . . . X . |
$$ ---------------------------------------[/go]
Top
 Profile  
 
Offline jlt
 Post subject: Re: Tsumegos from real games
Post #59 Posted: Tue Sep 21, 2021 2:14 am 
Lives in sente
User avatar

Posts: 1317
Liked others: 115
Was liked: 412
Position #25, White to live.

Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . . X . . |
$$ | . . X O . . . . O . X . . X . X . X . |
$$ | . . X O . O O . . , . . . . X O X X . |
$$ | . . . O . X X O O X . . . . . O O O . |
$$ | . X . . X . . X X O . . . . . . . . . |
$$ | . . . X . . . X O O . . . . . . . . . |
$$ | . . . . . X X O X . . X O O O O . . . |
$$ | . . . X . . O O . . O O X X X X X . . |
$$ | . O O O O . O . O , O X . . . , . . . |
$$ | . X . . . . . . . O X X . . . . O X . |
$$ | . . X . X . X . X . O X . . . O X X . |
$$ | . . . . . . . . . . O X . . . O X . . |
$$ | . X . O . X X X O . O X . . . . O O . |
$$ | . X O . O . . O . . . . . . . . O X . |
$$ | . O . , . . O . . , . . . . . O . X O |
$$ | . . . O . . . . O . X . . X X X O O . |
$$ | . . . . . . . . . . . . . . . . X X . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]
Top
 Profile  
 
Offline kvasir
 Post subject: Re: Tsumegos from real games
Post #60 Posted: Tue Sep 21, 2021 3:32 am 
Lives with ko

Posts: 206
Liked others: 17
Was liked: 20
Rank: panda 4 dan
IGS: kvasir
Position #25, White to live.
Click Here To Show Diagram Code
[go]$$Wc
$$ ---------------------------------------
$$ | . . . . . . . . . . . . . . . . . . . |
$$ | . . . O . . . . . . . . . . . . X . . |
$$ | . . X O . . . . O . X . . X . X . X . |
$$ | . . X O . O O . . , . . . . X O X X . |
$$ | . . . O . X X O O X . . . . . O O O . |
$$ | . X . . X . . X X O . . . . . . . . . |
$$ | . . . X . . . X O O . . . . . . . . . |
$$ | . . . . . X X O X . . X O O O O . . . |
$$ | . . . X . . O O . . O O X X X X X . . |
$$ | . O O O O . O . O , O X . . . , . . . |
$$ | . X . . . . . . . O X X . . . . O X . |
$$ | . . X . X . X . X . O X . 9 . O X X . |
$$ | . . . . . . . . . . O X . . 4 O X . . |
$$ | . X . O . X X X O . O X . 3 2 5 O O . |
$$ | . X O . O . . O . . . 8 7 . 1 . O X . |
$$ | . O . , . . O . . , . . . . 6 O . X O |
$$ | . . . O . . . . O . X . . X X X O O . |
$$ | . . . . . . . . . . . . . . . . X X . |
$$ | . . . . . . . . . . . . . . . . . . . |
$$ ---------------------------------------[/go]


Hope this is correct :D

It was hard to see that :w5: allows the net at :w9: so I looked at a few moves before coming back to :w1:

This post by kvasir was liked by: jlt
Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  Page 3 of 4
  [ 66 posts ]  Go to page Previous  1, 2, 3, 4  Next

Board index » Improve Your Game » Study Group

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