Life In 19x19 :: tsumego #33

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tsumego #33 http://www.lifein19x19.com/viewtopic.php?f=15&t=7378	Page 1 of 1

Author:	cyclops [ Thu Dec 06, 2012 5:34 pm ]
Post subject:	tsumego #33
Day #33 December 7th #33a Advanced problem Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|....X..... $$\|...XOX.XO. $$\|...OOX.XO. $$\|...O.OXXO, $$\|...O.OOO.. $$\|..........[/go]` #33b Intermediate problem Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|...O... $$\|OOO..X. $$\|.XO..X. $$\|.XOOOX. $$\|..XXX.. $$\|.......[/go]` #33c Elementary problem Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.XX.... $$\|XOOOOX. $$\|XOXXXX. $$\|OOX,... $$\|XXX.... $$\|.......[/go]` Pls check #32 thread to see some five years old quotes about #32a. Seems something rotten in the state of tsumego.

Author:	schawipp [ Fri Dec 07, 2012 1:20 am ]
Post subject:	Re: tsumego #33
I give it a try: #33c Elementary problem Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|2XX.1.. $$\|XOOOOX. $$\|XOXXXX. $$\|OOX,... $$\|XXX.... $$\|.......[/go]` and then ... Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.XX.1.. $$\|3OOOOX. $$\|.OXXXX. $$\|OOX,... $$\|XXX.... $$\|.......[/go]` This leads to "bent four in the corner" Edit: This is even "more" dead due to shortage of liberties #33b Intermediate problem Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.2.O... $$\|OOO3.X. $$\|.XO.1X. $$\|.XOOOX. $$\|..XXX.. $$\|.......[/go]` Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.4.O... $$\|OOO52X. $$\|.XO31X. $$\|.XOOOX. $$\|..XXX.. $$\|.......[/go]` Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.5.O... $$\|OOO42X. $$\|.XO31X. $$\|.XOOOX. $$\|..XXX.. $$\|.......[/go]` Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.4.O2.. $$\|OOO53X. $$\|.XO.1X. $$\|.XOOOX. $$\|..XXX.. $$\|.......[/go]` etc... in all variations, w is unconditionally dead #33a Advanced problem With this problem, I'm not really sure. First, it seems clear that there is only one eye around the G19 area. Thus, b has to make a second eye elsewhere, which is only possible in upper left corner. A possible start would be Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|.4..X..... $$\|.21XOX.XO. $$\|.35OOX.XO. $$\|...O.OXXO, $$\|...O.OOO.. $$\|..........[/go]` (5 is only move for b). After this I can not see how w could prevent a second eye, but maybe I'm missing another important variation.

Author:	Unusedname [ Fri Dec 07, 2012 1:23 am ]
Post subject:	Re: tsumego #33
#33a the best i could get was ko Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|....X..312 $$\|...XOX.XO4 $$\|...OOX.XO. $$\|...O.OXXO, $$\|...O.OOO.. $$\|..........[/go]` i can assume that white has to block else black gets free right? Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|..56X7.XXO $$\|314XOX8XOO $$\|.2.OOX.XO. $$\|...O.OXXO, $$\|...O.OOO.. $$\|..........[/go]` Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|.3X4XX.XXO $$\|XXO1OXOXOO $$\|.O2OOX.XO. $$\|...O.OXXO, $$\|...O.OOO.. $$\|..........[/go]` and now black needs another ko threat alternatively Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|..34X5.XXO $$\|.12XOX6XOO $$\|...OOX.XO. $$\|...O.OXXO, $$\|...O.OOO.. $$\|..........[/go]` Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|..X4XX.XXO $$\|.XO1OXOXOO $$\|.32OOX.XO. $$\|...O.OXXO, $$\|...O.OOO.. $$\|..........[/go]` again black needs a ko threat. #33b Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.b.O... $$\|OOOa1X. $$\|.XO..X. $$\|.XOOOX. $$\|..XXX.. $$\|.......[/go]` i think just 1 is enough a and b miai #33c Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|2XX.1.. $$\|XOOOOX. $$\|XOXXXX. $$\|OOX,... $$\|XXX.... $$\|.......[/go]` Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|CXX.X.. $$\|3OOOOX. $$\|.OXXXX. $$\|OOX,... $$\|XXX.... $$\|.......[/go]`

Author:	TIM82 [ Fri Dec 07, 2012 1:32 am ]
Post subject:	Re: tsumego #33
First time posting, hope I did not mess the markup. #33a Advanced problem In my reading, if 1, after 2 no mattew how B answers, a kills. Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|...2X..... $$\|..1XOX.XO. $$\|.a.OOX.XO. $$\|...O.OXXO, $$\|...O.OOO.. $$\|..........[/go]` If 1, after 2 and 3, there is ko (b can get an eye by playing a if w connects at b) Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|..3.X..... $$\|.12XOX.XO. $$\|.abOOX.XO. $$\|...O.OXXO, $$\|...O.OOO.. $$\|..........[/go]` If ko is not an option due to threats, B could perhas sacrifice right side? After 3, 4 seems forced, and then 5 looks like it lives or runs? Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|...2.4.... $$\|..1XOX.XO. $$\|.3.OOX.XO. $$\|...O.OXXO, $$\|.5.O.OOO.. $$\|..........[/go]` what did I miss, or misread?

Author:	Unusedname [ Fri Dec 07, 2012 1:40 am ]
Post subject:	Re: tsumego #33
TIM82 wrote: First time posting, hope I did not mess the markup. #33a Advanced problem If ko is not an option due to threats, B could perhas sacrifice right side? After 3, 4 seems forced, and then 5 looks like it lives or runs? Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|...2.4.... $$\|..1XOX.XO. $$\|.3.OOX.XO. $$\|...O.OXXO, $$\|.5.O.OOO.. $$\|..........[/go]` what did I miss, or misread? I think white can kill without letting black escape by playing here Click Here To Show Diagram Code `[go]$$Bc $$----------- $$\|....X..... $$\|..1XOX.XO. $$\|.2.OOX.XO. $$\|...O.OXXO, $$\|...O.OOO.. $$\|..........[/go]`

Author:	schawipp [ Fri Dec 07, 2012 4:41 am ]
Post subject:	Re: tsumego #33
Unusedname wrote: #33a #33b Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.b.O... $$\|OOOa1X. $$\|.XO..X. $$\|.XOOOX. $$\|..XXX.. $$\|.......[/go]` i think just 1 is enough a and b miai I think, this does not work: Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.b.O... $$\|OOO21X. $$\|.XO.aX. $$\|.XOOOX. $$\|..XXX.. $$\|.......[/go]` If white answers this way, then a and b are miai for life.

Author:	SoDesuNe [ Fri Dec 07, 2012 4:44 am ]
Post subject:	Re: tsumego #33
schawipp wrote: Unusedname wrote: #33a #33b Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.b.O... $$\|OOOa1X. $$\|.XO..X. $$\|.XOOOX. $$\|..XXX.. $$\|.......[/go]` i think just 1 is enough a and b miai I think, this does not work: Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.b.O... $$\|OOO21X. $$\|.XO.aX. $$\|.XOOOX. $$\|..XXX.. $$\|.......[/go]` If white answers this way, then a and b are miai for life. Correct. That's why: Click Here To Show Diagram Code `[go]$$Bc $$-------- $$\|.b.O... $$\|OOOa.X. $$\|.XO.1X. $$\|.XOOOX. $$\|..XXX.. $$\|.......[/go]` I guess, Black plays , making 'a' and 'b' Miai.

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