Life In 19x19 :: tsumego exploration #19

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tsumego exploration #19 http://prod.lifein19x19.com/viewtopic.php?f=15&t=7264	Page 1 of 1

Author:	cyclops [ Thu Nov 22, 2012 6:56 am ]
Post subject:	tsumego exploration #19
On Topasz' request I will open a new thread for every new series of problems. #17 & #18 are in my previous thread. Sverre solved #18 while #17c is not killed yet unconditionally. ( there is no garantee it is possible, but about all were ) I give some additional time. This threads tries to repeat the success of explo's tsumego problems at Godiscussions 5 years ago. I am just copying.

Author: cyclops [ Thu Nov 22, 2012 5:18 pm ]

Post subject: Re: tsumego exploration #19

Day #19 November 23th
Black to move. Conditional solutions are suspect.

Elementary problem

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

Intermediate problem

Click Here To Show Diagram Code: [go]$$Bc $$------- $$|...OX. $$|.OOOX. $$|.OXXX. $$|.OX,.. $$|.XX... $$|......[/go]

Advanced problem

Click Here To Show Diagram Code: [go]$$Bc $$---------- $$|......... $$|XXXXOOOX. $$|OOOOOX.X. $$|.XXXXX... $$|.........[/go]

Author:	topazg [ Thu Nov 22, 2012 5:25 pm ]
Post subject:	Re: tsumego exploration #19
Elementary problem Click Here To Show Diagram Code `[go]$$Bc $$---------- $$\|.3.21.... $$\|.OOOOX.X. $$\|.OXXXX... $$\|.X.,..... $$\|..X...... $$\|.........[/go]` Intermediate problem Click Here To Show Diagram Code `[go]$$Bc $$------- $$\|.1.OX. $$\|3OOOX. $$\|.OXXX. $$\|2OX,.. $$\|.XX... $$\|......[/go]` May come back to advanced one

Author:	cyclops [ Thu Nov 22, 2012 5:42 pm ]
Post subject:	Re: tsumego exploration #19
topazg wrote: ........ May come back to advanced one Dans only get points for the advanced solutions. Don't forget #17c!

Author:	Josh Hatch [ Thu Nov 22, 2012 6:54 pm ]
Post subject:	Re: tsumego exploration #19
Advanced problem: Click Here To Show Diagram Code `[go]$$Bc $$---------- $$\|.1.234... $$\|XXXXOOOX. $$\|OOOOOX5X. $$\|.XXXXX... $$\|.........[/go]` I don't see any stronger responses for white. Everything else seems to turn out the same.

Author:	logan [ Thu Nov 22, 2012 7:08 pm ]
Post subject:	Re: tsumego exploration #19
cyclops wrote: topazg wrote: ........ May come back to advanced one Dans only get points for the advanced solutions. Don't forget #17c! I got points for that one, right? Click Here To Show Diagram Code `[go]$$Bc $$---------- $$\|.5.43.... $$\|2OOOOX.X. $$\|1OXXXX... $$\|.X.,..... $$\|..X...... $$\|.........[/go]` Click Here To Show Diagram Code `[go]$$Bc $$------- $$\|31.OX. $$\|.OOOX. $$\|.OXXX. $$\|2OX,.. $$\|.XX... $$\|......[/go]` SIKE! Click Here To Show Diagram Code `[go]$$Bc $$------- $$\|.1.OX. $$\|3OOOX. $$\|.OXXX. $$\|2OX,.. $$\|.XX... $$\|......[/go]` Click Here To Show Diagram Code `[go]$$Bc @ $$---------- $$\|.1.234.6. $$\|XXXXOOOX7 $$\|OOOOOX5X. $$\|9XXXXX... $$\|.........[/go]`

Author:	Sverre [ Thu Nov 22, 2012 8:08 pm ]
Post subject:	Re: tsumego exploration #19
cyclops wrote: Day #19 November 23th Black to move. Conditional solutions are suspect. Elementary problem White has a length-5 potential eyespace open at both ends. Two hanes in either order reduces him to a 3-space killable shape. The 1-2 point also kills, by bent 4. Click Here To Show Diagram Code `[go]$$Bc $$---------- $$\|.5.43.... $$\|2OOOOX.X. $$\|1OXXXX... $$\|.X.,..... $$\|..X...... $$\|.........[/go]` Click Here To Show Diagram Code `[go]$$Bc $$---------- $$\|4.531.... $$\|.OOOOX.X. $$\|2OXXXX... $$\|.X.,..... $$\|..X...... $$\|.........[/go]` Click Here To Show Diagram Code `[go]$$Bc $$---------- $$\|315.4.... $$\|.OOOOX.X. $$\|2OXXXX... $$\|.X.,..... $$\|..X...... $$\|.........[/go]` Intermediate problem White is threatening to split his eyespace and live. Starting at the 1-2 point is the only viable attack. Click Here To Show Diagram Code `[go]$$Bc B1 anywhere else, W plays 1 $$------- $$\|.1.OX. $$\|3OOOX. $$\|.OXXX. $$\|2OX,.. $$\|.XX... $$\|......[/go]` Advanced problem If W captures B's 4 stones, he is alive no matter what, so this is necessarily a semeai problem. Black can't make a big eyeshape but even a small eye can force the opponent to spend approach moves. Click Here To Show Diagram Code `[go]$$Bc 6@3 $$---------- $$\|.1.234... $$\|XXXXOOOX. $$\|OOOOOX5X. $$\|7XXXXX... $$\|.........[/go]`

Author:	cyclops [ Fri Nov 23, 2012 7:50 am ]
Post subject:	Re: tsumego exploration #19
cyclops wrote: ...... Don't forget #17c! logan wrote: I got points for that one, right? cyclops wrote: ...... Conditional solutions are suspect. You get one point with a question mark. to be shared with Topasz, Noname& Sverre And an official warning because you spoiled my splendid "solution".

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