Life In 19x19 :: My attempt at a 3-dan problem (black to play)

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My attempt at a 3-dan problem (black to play) http://www.lifein19x19.com/viewtopic.php?f=15&t=8665	Page 1 of 1

Author:	tekesta [ Fri Jul 05, 2013 7:07 pm ]
Post subject:	My attempt at a 3-dan problem (black to play)
I know I'm not 三段, but I just had to try this one out My answer: 1@AB, 2@AC, 3@DC, 4@CC, 5@DB, 6@DA, 7@EC I chose Black 1 @ AB since Black threatens to connect out. White plays @ AC to prevent it. Black 3 puts the 4 Whites into atari. White 4 connects. Black 5 extends to the 2nd line. White 6 @ EC is not an option due to shortage of liberties, so White plays @ DA to atari the 2 Blacks. Black 7 at EC puts 4 Whites into atari. Another answer: 1@AB, 2@AC, 3@DB, 4@DC, 5@EC, 6@DA, 7@BB, 8@CC, 9@BA White 4 @ EC will result in two White groups in atari once Black plays at DC, so White plays at DC. Double atari after Black 5. White captures @ DA. Atari on 2 White stones with Black 7. White 8 is at CC to connect. After Black 9 White group cannot atari 3 Black stones in the corner due to shortage of liberties.

Author: Sverre [ Fri Jul 05, 2013 11:07 pm ]

Post subject: Re: My attempt at a 3-dan problem (black to play)

tekesta wrote:

My answer: 1@AB, 2@AC, 3@DC, 4@CC, 5@DB, 6@DA, 7@EC

I chose Black 1 @ AB since Black threatens to connect out. White plays @ AC to prevent it. Black 3 puts the 4 Whites into atari. White 4 connects. Black 5 extends to the 2nd line. White 6 @ EC is not an option due to shortage of liberties, so White plays @ DA to atari the 2 Blacks. Black 7 at EC puts 4 Whites into atari.

Another answer: 1@AB, 2@AC, 3@DB, 4@DC, 5@EC, 6@DA, 7@BB, 8@CC, 9@BA

White 4 @ EC will result in two White groups in atari once Black plays at DC, so White plays at DC. Double atari after Black 5. White captures @ DA. Atari on 2 White stones with Black 7. White 8 is at CC to connect. After Black 9 White group cannot atari 3 Black stones in the corner due to shortage of liberties.

I tried to translate your variations to diagrams, is this correct?

Click Here To Show Diagram Code: [go]$$Bc Problem $$|........ $$|........ $$|XXX..... $$|XOOXX... $$|XXOOX... $$|.O...X.. $$|..O.OX.X $$|....OOX. $$---------[/go]

Click Here To Show Diagram Code: [go]$$Bc Your first variation $$|........ $$|........ $$|XXX..... $$|XOOXX... $$|XXOOX... $$|2O437X.. $$|1.O5OX.X $$|...6OOX. $$---------[/go]

Click Here To Show Diagram Code: [go]$$Bc Your second variation $$|........ $$|........ $$|XXX..... $$|XOOXX... $$|XXOOX... $$|2O845X.. $$|17O3OX.X $$|.9.6OOX. $$---------[/go]

If so, I think the first variation is wrong because White can sacrifice his 4 stones. How do you play after :w4:

? And your second variation is seki.

Click Here To Show Diagram Code: [go]$$Bc Your first variation $$|........ $$|........ $$|XXX..... $$|XOOXX... $$|XXOOX... $$|2O.3.X.. $$|1.O4OX.X $$|....OOX. $$---------[/go]

Author:	Shaddy [ Sat Jul 06, 2013 9:19 am ]
Post subject:	Re: My attempt at a 3-dan problem (black to play)
My attempt: Click Here To Show Diagram Code `[go]$$Bc Problem $$\|........ $$\|........ $$\|XXX..... $$\|XOOXX... $$\|XXOOX... $$\|.O75.X.. $$\|21O6OX.X $$\|834.OOX. $$---------[/go]` 9-1

Author:	illluck [ Sat Jul 06, 2013 9:27 am ]
Post subject:	Re: My attempt at a 3-dan problem (black to play)
Shaddy wrote: My attempt: Click Here To Show Diagram Code `[go]$$Bc Problem $$\|........ $$\|........ $$\|XXX..... $$\|XOOXX... $$\|XXOOX... $$\|.O75.X.. $$\|21O6OX.X $$\|834.OOX. $$---------[/go]` 9-1 @Shaddy: Ko? Click Here To Show Diagram Code `[go]$$Bc Problem $$\|........ $$\|........ $$\|XXX..... $$\|XOOXX... $$\|XXOOX... $$\|.O.4.X.. $$\|21O.OX.X $$\|.3..OOX. $$---------[/go]`

Author:	illluck [ Sat Jul 06, 2013 12:01 pm ]
Post subject:	Re: My attempt at a 3-dan problem (black to play)
Shaddy's variation is quite valuable as that idea didn't even occur to me. Using his variation as the basis: Click Here To Show Diagram Code `[go]$$Bc Problem $$\|........ $$\|........ $$\|XXX..... $$\|XOOXX... $$\|XXOOX... $$\|4O21.X.. $$\|3.O5OX.X $$\|....OOX. $$---------[/go]` Click Here To Show Diagram Code `[go]$$Bc Problem $$\|........ $$\|........ $$\|XXX..... $$\|XOOXX... $$\|XXOOX... $$\|.O.1.X.. $$\|43O2OX.X $$\|.56.OOX. $$---------[/go]` And so on with Shaddy's variation. Click Here To Show Diagram Code `[go]$$Bc Problem $$\|........ $$\|........ $$\|XXX..... $$\|XOOXX... $$\|XXOOX... $$\|bO61aX.. $$\|43O2OX.X $$\|.57.OOX. $$---------[/go]` If a then b and it's a golden chicken standing on one leg.

Author:	tekesta [ Sat Jul 06, 2013 4:39 pm ]
Post subject:	Re: My attempt at a 3-dan problem (black to play)
@Sverre: Yes, that is the problem depicted in the photo. The diagrams correctly depict the sequences I mentioned. Thank you for producing the diagrams. -------------------------------- I had a feeling that the first answer would not work since White can live by sacrificing the top 4 stones. The second answer would be closer to the correct solution, although seki is probably not the answer that the author of the problem wants. Shaddy's answer with throw-in as final move never occurred to me. Now I see why it's rated 3-dan. In any case it's fun to play around with these tsumego Thanks to all who posted here for your answers.

Author:	Shaddy [ Sat Jul 06, 2013 6:35 pm ]
Post subject:	Re: My attempt at a 3-dan problem (black to play)
Damn, I got the order wrong. I'm really rusty, it seems..

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