Life In 19x19 :: Tsumegos from real games

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:

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.

Author:	Joaz Banbeck [ Sat Feb 12, 2022 11:57 am ]
Post subject:	Re: Tsumegos from real games
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.

Author:	kvasir [ Sat Feb 12, 2022 12:11 pm ]
Post subject:	Re: Tsumegos from real games
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 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]

Author:	jlt [ Sat Feb 12, 2022 12:19 pm ]
Post subject:	Re: Tsumegos from real games
Why not at A12 ?

Author:	jlt [ Sat Feb 12, 2022 12:42 pm ]
Post subject:	Re: Tsumegos from real games
Actually if White makes the exchange a-b first then Black does have to pull back at 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.

Author:	kvasir [ Sat Feb 12, 2022 12:49 pm ]
Post subject:	Re: Tsumegos from real games
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]

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

Tsumegos from real games http://lifein19x19.com/viewtopic.php?f=15&t=17076	Page 5 of 5

Author:	kvasir [ Sat Feb 12, 2022 1:08 pm ]
Post subject:	Re: Tsumegos from real games
Joaz Banbeck wrote: Problem #30: The cross cut might fail like this. At least I don't see what to do after white captures 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]

Author:	Joaz Banbeck [ Sat Feb 12, 2022 4:12 pm ]
Post subject:	Re: Tsumegos from real games
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 ... 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.

Author:	Harleqin [ Mon Feb 14, 2022 2:57 am ]
Post subject:	Re: Tsumegos from real games
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]

Author:	jlt [ Mon Mar 14, 2022 12:31 am ]
Post subject:	Re: Tsumegos from real games
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 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.

Author:	jlt [ Thu May 05, 2022 2:43 am ]
Post subject:	Re: Tsumegos from real games
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]

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