Life In 19x19 :: Tsumegos from real games

Problem #42, what can White to?

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

Answer

Author:	jlt [ Tue Feb 06, 2024 2:51 am ]
Post subject:	Re: Tsumegos from real games
Problem #39, Black to play. Click Here To Show Diagram Code [go]$$Bc Black to play $$ --------------------------------------- $$ \| . . . . . . . . . . . . O O O X . . . \| $$ \| . O . O O X X . . . . O X . X X . . . \| $$ \| . . . O X . . X . X X O X . O X O . . \| $$ \| . O O X X X . X O , O O X X O X X . . \| $$ \| . O X O O X . X O . O O O X X . X X . \| $$ \| . X X X O X X X O . X . X O O X O X X \| $$ \| . . . O O O O X O . . . X . . O O O X \| $$ \| . X X O X X X O O O X X . X . O X X X \| $$ \| X . X O O X X O . . O X . X O O O O O \| $$ \| . X O O X X O O O , O X . X . , . O . \| $$ \| . O . O O X O X O . O X . X O O O X . \| $$ \| . . . . . X O X O O X X X O . . O X . \| $$ \| . . X O O X X X X O O . . O O O X . . \| $$ \| . O O X X . X O X X X X X O X . X . . \| $$ \| . O O X . . O O X X O O O X X X . . . \| $$ \| . X O O O O O X X O . O X X O O X . . \| $$ \| . X X X O X X O O O . . O . O X . . . \| $$ \| . . . . X . X X O . . O . O O X . . . \| $$ \| . . . . . . . . . . . . . . X . . . . \| $$ ---------------------------------------[/go] Answer: Click Here To Show Diagram Code [go]$$Bc Black to play $$ --------------------------------------- $$ \| . . . . . . . . . . . . O O O X . . . \| $$ \| . O . O O X X . . . . O X . X X . . . \| $$ \| . . . O X . . X . X X O X . O X O . . \| $$ \| . O O X X X . X O , O O X X O X X . . \| $$ \| . O X O O X . X O . O O O X X . X X . \| $$ \| . X X X O X X X O . X . X O O X O X X \| $$ \| . . . O O O O X O . . . X . . O O O X \| $$ \| . X X O X X X O O O X X . X . O X X X \| $$ \| X . X O O X X O . . O X . X O O O O O \| $$ \| . X O O X X O O O , O X . X . , . O . \| $$ \| 4 O . O O X O X O . O X . X O O O X . \| $$ \| 5 3 . 2 1 X O X O O X X X O . . O X . \| $$ \| . . X O O X X X X O O . . O O O X . . \| $$ \| . O O X X . X O X X X X X O X . X . . \| $$ \| . O O X . . O O X X O O O X X X . . . \| $$ \| . X O O O O O X X O . O X X O O X . . \| $$ \| . X X X O X X O O O . . O . O X . . . \| $$ \| . . . . X . X X O . . O . O O X . . . \| $$ \| . . . . . . . . . . . . . . X . . . . \| $$ ---------------------------------------[/go]

Author:	jlt [ Fri Mar 01, 2024 6:21 am ]
Post subject:	Re: Tsumegos from real games
Problem #40, White to play. I've probably seen the problem before, but forgot it. Click Here To Show Diagram Code `[go]Wc $$ \| . . . O O X . O . O . X $$ \| . . O O X O X . . . . X $$ \| . O . . X O . X X X X . $$ \| . X O O X . O O O O X . $$ \| . X X X O O . . . . O O $$ \| . . . . X X O X . . . . $$ \| . . . . . . O . . . . . $$ -------------------------[/go]`

Author:	dfan [ Sat Mar 02, 2024 12:58 pm ]
Post subject:	Re: Tsumegos from real games
Yeah, this one shows up in life and death manuals. I learned it as part of the J-group collection.

Author:	Harleqin [ Sat Mar 02, 2024 6:13 pm ]
Post subject:	Re: Tsumegos from real games
I think like this: Click Here To Show Diagram Code `[go]$$Wc $$ \| . . . O O X . O . O . X $$ \| . . O O X O X . . . . X $$ \| . O . . X O . X X X X . $$ \| . X O O X . O O O O X . $$ \| . X X X O O . . . . O O $$ \| . . 2 1 X X O X . . . . $$ \| . 3 . . . . O . . . . . $$ -------------------------[/go]`

Author:	jlt [ Mon Mar 04, 2024 12:26 am ]
Post subject:	Re: Tsumegos from real games
Problem #41, Black to live. Click Here To Show Diagram Code [go]$$Bc Black to live $$ --------------------------------------- $$ \| . . . . . . . . . . . . . . . O . . . \| $$ \| . . X X O O . . . . . . . X O . . . . \| $$ \| . . X O . X O . . . . . X X X O O O . \| $$ \| . . X O . . . . . O . . . . O X X O . \| $$ \| . . . O . . . . . . . . . . X . . X . \| $$ \| . . X X . . . . . . . . . . . . X . . \| $$ \| . . . . . . . . . . . . . . . . . . . \| $$ \| . . O . . . . . . . . . . . . . . . . \| $$ \| . . . . . . . . . . . . . . . . X . . \| $$ \| . . . , X . . . . , . . . . . , . . . \| $$ \| . . O O X O . . . . . . . . . O . . . \| $$ \| . . . X O O . . . . . . . . . . . . . \| $$ \| . W . X O X X . . . . . . . O . . . . \| $$ \| . . X . X O . X . . . . . X O X . . . \| $$ \| . . . X . O . . . . X . X . X O O . . \| $$ \| . X X O . . O . X , . O . . X , . . . \| $$ \| . X O O . O X . X O . . . O . X X O . \| $$ \| . O . . O X . X O O . . . . O O X . . \| $$ \| . . . . . . . . . . . . . . . . . . . \| $$ ---------------------------------------[/go] Answer: Click Here To Show Diagram Code [go]$$Bc Black to live $$ --------------------------------------- $$ \| . . . . . . . . . . . . . . . O . . . \| $$ \| . . X X O O . . . . . . . X O . . . . \| $$ \| . . X O . X O . . . . . X X X O O O . \| $$ \| . . X O . . . . . O . . . . O X X O . \| $$ \| . . . O . . . . . . . . . . X . . X . \| $$ \| . . X X . . . . . . . . . . . . X . . \| $$ \| . . . . . . . . . . . . . . . . . . . \| $$ \| . . O . . . . . . . . . . . . . . . . \| $$ \| . . . . . . . . . . . . . . . . X . . \| $$ \| . . . , X . . . . , . . . . . , . . . \| $$ \| . 6 O O X O . . . . . . . . . O . . . \| $$ \| . 3 4 X O O . . . . . . . . . . . . . \| $$ \| . O 5 X O X X . . . . . . . O . . . . \| $$ \| . 7 X . X O . X . . . . . X O X . . . \| $$ \| . . . X 1 O . . . . X . X . X O O . . \| $$ \| . X X O 2 . O . X , . O . . X , . . . \| $$ \| . X O O . O X . X O . . . O . X X O . \| $$ \| . O . . O X . X O O . . . . O O X . . \| $$ \| . . . . . . . . . . . . . . . . . . . \| $$ ---------------------------------------[/go]

Life In 19x19 http://www.lifein19x19.com/

Tsumegos from real games http://www.lifein19x19.com/viewtopic.php?f=15&t=17076	Page 6 of 6

Author:	jlt [ Mon Mar 25, 2024 4:55 am ]
Post subject:	Re: Tsumegos from real games
Problem #41, Black to kill the upper left corner. Not very difficult but it was a blitz game and I failed completely. Click Here To Show Diagram Code [go]$$Bc Black to play. $$ --------------------------------------- $$ \| . O . . O . . . . . . . . . . . . . . \| $$ \| . X O O X X X . . . . X . . . . . . . \| $$ \| . X . O O O X X X X . . . . . X O . . \| $$ \| . O O X X O X O X O O . . . . X O . . \| $$ \| . . X X O X O O O O . . . . . X O . . \| $$ \| . X . . O X . . O . O . . . . X X O . \| $$ \| . . X . O X X . X O X X X X X O O . . \| $$ \| . . X O O X O X X O O O X O O X O . . \| $$ \| . X O . . O . O X X O . O . O X O . . \| $$ \| . X O , . O O O X X O X . . O X X . . \| $$ \| . . X X . . . O X X X O O O O O X X . \| $$ \| . . . . . O O X O X . X X O X X O . . \| $$ \| . X O . . O X . O X . X X X X O O O O \| $$ \| . X O . . . X X O X X X X O O . O X . \| $$ \| . X O . . X O X X X O O O . . O X . X \|[/go]

Author:	xela [ Mon Mar 25, 2024 3:01 pm ]
Post subject:	Re: Tsumegos from real games
Cute! What I might have done in a blitz game Click Here To Show Diagram Code `[go]$$Bc Ko $$ --------------------------------------- $$ \| 5 O . 1 O . . . . . . . . . . . . . . \| $$ \| 2 X O O X X X . . . . X . . . . . . . \| $$ \| 3 X . O O O X X X X . . . . . X O . . \| $$ \| 4 O O X X O X O X O O . . . . X O . . \| $$ \| . . X X O X O O O O . . . . . X O . . \| $$ \| . X . . O X . . O . O . . . . X X O . \| $$ \| . . X . O X X . X O X X X X X O O . . \|[/go]` What I can see when I think for a minute Click Here To Show Diagram Code `[go]$$Bc Black wins the capturing race $$ --------------------------------------- $$ \| b O . 2 O . . . . . . . . . . . . . . \| $$ \| 1 X O O X X X . . . . X . . . . . . . \| $$ \| a X 3 O O O X X X X . . . . . X O . . \| $$ \| . O O X X O X O X O O . . . . X O . . \| $$ \| . . X X O X O O O O . . . . . X O . . \| $$ \| . X . . O X . . O . O . . . . X X O . \| $$ \| . . X . O X X . X O X X X X X O O . . \|[/go]` Two liberties each, but white needs an approach move and can't play either 'a' or 'b' directly, so black wins. If at instead, now at actually does work.

Author:	mart900 [ Tue Mar 26, 2024 9:32 am ]
Post subject:	Re: Tsumegos from real games
Not exactly tsumego, but you might find this interesting https://realgoproblems.com/

Author:	xela [ Tue Mar 26, 2024 4:08 pm ]
Post subject:	Re: Tsumegos from real games
mart900 wrote: Not exactly tsumego, but you might find this interesting https://realgoproblems.com/ Discussion in the other thread at https://lifein19x19.com/viewtopic.php?f=9&t=19425

Author:	jlt [ Thu May 30, 2024 2:05 am ]
Post subject:	Re: Tsumegos from real games
Problem #42, what can White to? Click Here To Show Diagram Code [go]$$Wc $$ --------------------------------------- $$ \| . . . . . . . . . . . . . . . . . . . \| $$ \| . . O . . . . . . . . . X X O B . . . \| $$ \| . . O X X . X X X . X X O X O . O O . \| $$ \| . . . O . X O . O O . . O . X X X X . \| $$ \| . . . . . O . O . . . . . . . . . . . \| $$ \| . . O O O . . . . . . . . . . . O . . \| $$ \| . . X X O X X . X . . . . . . . O . . \| $$ \| . . X O X . O X . X . . . . . O . O . \| $$ \| . . X O X . X . . X O . . . X X O . . \| $$ \| . . . O O O O X X O . . . X O O X . . \| $$ \| . . O . O X O O O . . . . . . O X . . \| $$ \| . . . . O X . X O . . . . . X O O . . \| $$ \| . . X O . X . X O . . . . . . X O . . \| $$ \| . . X . . X . O . O . . . . . X O . . \| $$ \| . . . . . . . . O X X . . . . X X O . \| $$ \| . . . X X X O O X , . . . . . X O O . \| $$ \| . . X O O O O X . X . . . X . . X O . \| $$ \| . . X . . . O X . . . . . . . . X . . \| $$ \| . . . . . . . . . . . . . . . . . . . \| $$ ---------------------------------------[/go] Answer Click Here To Show Diagram Code [go]$$Wc $$ --------------------------------------- $$ \| . . . . . . . . . . . . . 6 2 4 5 a . \| $$ \| . . O . . . . . . . . . X X O X 3 . 9 \| $$ \| . . O X X . X X X . X X O X O 1 O O . \| $$ \| . . . O . X O . O O . . O b X X X X 7 \| $$ \| . . . . . O . O . . . . . . . . . 8 . \| $$ \| . . O O O . . . . . . . . . . . O . . \| $$ \| . . X X O X X . X . . . . . . . O . . \| $$ \| . . X O X . O X . X . . . . . O . O . \| $$ \| . . X O X . X . . X O . . . X X O . . \| $$ \| . . . O O O O X X O . . . X O O X . . \| $$ \| . . O . O X O O O . . . . . . O X . . \| $$ \| . . . . O X . X O . . . . . X O O . . \| $$ \| . . X O . X . X O . . . . . . X O . . \| $$ \| . . X . . X . O . O . . . . . X O . . \| $$ \| . . . . . . . . O X X . . . . X X O . \| $$ \| . . . X X X O O X , . . . . . X O O . \| $$ \| . . X O O O O X . X . . . X . . X O . \| $$ \| . . X . . . O X . . . . . . . . X . . \| $$ \| . . . . . . . . . . . . . . . . . . . \| $$ ---------------------------------------[/go] If Black a then White b and White has a ko to kill black stones in order to survive.

Author:	EricBackus [ Tue Jun 11, 2024 12:16 pm ]
Post subject:	Re: Tsumegos from real games
jlt wrote: Problem #42, what can White to? Click Here To Show Diagram Code [go]$$Wc $$ --------------------------------------- $$ \| . . . . . . . . . . . . . . . . . . . \| $$ \| . . O . . . . . . . . . X X O B . . . \| $$ \| . . O X X . X X X . X X O X O . O O . \| $$ \| . . . O . X O . O O . . O . X X X X . \| $$ \| . . . . . O . O . . . . . . . . . . . \| $$ \| . . O O O . . . . . . . . . . . O . . \| $$ \| . . X X O X X . X . . . . . . . O . . \| $$ \| . . X O X . O X . X . . . . . O . O . \| $$ \| . . X O X . X . . X O . . . X X O . . \| $$ \| . . . O O O O X X O . . . X O O X . . \| $$ \| . . O . O X O O O . . . . . . O X . . \| $$ \| . . . . O X . X O . . . . . X O O . . \| $$ \| . . X O . X . X O . . . . . . X O . . \| $$ \| . . X . . X . O . O . . . . . X O . . \| $$ \| . . . . . . . . O X X . . . . X X O . \| $$ \| . . . X X X O O X , . . . . . X O O . \| $$ \| . . X O O O O X . X . . . X . . X O . \| $$ \| . . X . . . O X . . . . . . . . X . . \| $$ \| . . . . . . . . . . . . . . . . . . . \| $$ ---------------------------------------[/go] Answer Click Here To Show Diagram Code [go]$$Wc $$ --------------------------------------- $$ \| . . . . . . . . . . . . . 6 2 4 5 a . \| $$ \| . . O . . . . . . . . . X X O X 3 . 9 \| $$ \| . . O X X . X X X . X X O X O 1 O O . \| $$ \| . . . O . X O . O O . . O b X X X X 7 \| $$ \| . . . . . O . O . . . . . . . . . 8 . \| $$ \| . . O O O . . . . . . . . . . . O . . \| $$ \| . . X X O X X . X . . . . . . . O . . \| $$ \| . . X O X . O X . X . . . . . O . O . \| $$ \| . . X O X . X . . X O . . . X X O . . \| $$ \| . . . O O O O X X O . . . X O O X . . \| $$ \| . . O . O X O O O . . . . . . O X . . \| $$ \| . . . . O X . X O . . . . . X O O . . \| $$ \| . . X O . X . X O . . . . . . X O . . \| $$ \| . . X . . X . O . O . . . . . X O . . \| $$ \| . . . . . . . . O X X . . . . X X O . \| $$ \| . . . X X X O O X , . . . . . X O O . \| $$ \| . . X O O O O X . X . . . X . . X O . \| $$ \| . . X . . . O X . . . . . . . . X . . \| $$ \| . . . . . . . . . . . . . . . . . . . \| $$ ---------------------------------------[/go] If Black a then White b and White has a ko to kill black stones in order to survive. If I'm understanding this right, your "Black a then White b" ends up as a multi-step ko that is disadvantageous to white. Initially I thought that this would be better: Click Here To Show Diagram Code [go]$$Wc $$ --------------------------------------- $$ \| . . . . . . . . . . . . . . 2 3 4 6 . \| $$ \| . . O . . . . . . . . . X X O X 5 . . \| $$ \| . . O X X . X X X . X X O X O 1 O O . \| $$ \| . . . O . X O . O O . . O b X X X X . \| $$ \| . . . . . O . O . . . . . . . . . . . \| $$ \| . . O O O . . . . . . . . . . . O . . \| $$ \| . . X X O X X . X . . . . . . . O . . \| $$ \| . . X O X . O X . X . . . . . O . O . \| $$ \| . . X O X . X . . X O . . . X X O . . \| $$ \| . . . O O O O X X O . . . X O O X . . \| $$ \| . . O . O X O O O . . . . . . O X . . \| $$ \| . . . . O X . X O . . . . . X O O . . \| $$ \| . . X O . X . X O . . . . . . X O . . \| $$ \| . . X . . X . O . O . . . . . X O . . \| $$ \| . . . . . . . . O X X . . . . X X O . \| $$ \| . . . X X X O O X , . . . . . X O O . \| $$ \| . . X O O O O X . X . . . X . . X O . \| $$ \| . . X . . . O X . . . . . . . . X . . \| $$ \| . . . . . . . . . . . . . . . . . . . \| $$ ---------------------------------------[/go] Then 7 captures at 3 to start the ko. But this is also multi-step, and maybe the threat at b doesn't work. It's interesting to me because I mentally went down several different paths that I thought were better than your solution, only to eventually convince myself that your solution looks better.

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