Just a guess, but it involves the aji of the cut at E9?
Edit: The intervening posts that came in while I was trying to figure this out show me just how woeful my reading skills are.
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| life & death from a pro game http://www.lifein19x19.com/viewtopic.php?f=10&t=12288 |
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| Author: | macelee [ Thu Sep 24, 2015 2:06 pm ] |
| Post subject: | life & death from a pro game |
From today's Chinese League A: http://www.go4go.net/go/games/sgfview/49888 How would black survive if white playes 'a' now? It took me quite a while to find out. |
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| Author: | jdl [ Thu Sep 24, 2015 4:28 pm ] |
| Post subject: | Re: life & death from a pro game |
This is as close as I can come to something that looks like it might work. If white plays 7 black can play 6. |
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| Author: | DrStraw [ Thu Sep 24, 2015 4:31 pm ] |
| Post subject: | Re: life & death from a pro game |
How about this? |
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| Author: | Fedya [ Thu Sep 24, 2015 4:59 pm ] |
| Post subject: | Re: life & death from a pro game |
Just a guess, but it involves the aji of the cut at E9? Edit: The intervening posts that came in while I was trying to figure this out show me just how woeful my reading skills are.
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| Author: | ez4u [ Thu Sep 24, 2015 8:19 pm ] |
| Post subject: | Re: life & death from a pro game |
I am thinking something like below. |
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| Author: | Darrell [ Thu Sep 24, 2015 9:10 pm ] |
| Post subject: | Re: life & death from a pro game |
DrStraw wrote: How about this? |
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| Author: | Kirby [ Thu Sep 24, 2015 10:20 pm ] |
| Post subject: | Re: life & death from a pro game |
| Author: | macelee [ Thu Sep 24, 2015 10:47 pm ] |
| Post subject: | Re: life & death from a pro game |
So many attempts! Good to see you are actually interested in this sort of post. Let's first simplify the problem. Following is taken from ez4u's answer, which is the correct sequence if white attempts to kill this group. Now the problem becomes: Next black most certainly would play 'a' instead of 'b'. If swapping these two, white would have another way home at 'c' so black is hopeless. So what's next? Note that the aji of the marked stone must be exploited. |
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| Author: | Kirby [ Fri Sep 25, 2015 1:03 pm ] |
| Post subject: | Re: life & death from a pro game |
I see. My move 7 wasn't sente. I don't know why I misread that it was. Anyway, macelee, you're right: these types of posts are interesting, and I'd be happy to see more of them in the future. |
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| Author: | macelee [ Fri Sep 25, 2015 11:19 pm ] |
| Post subject: | Re: life & death from a pro game |
Kirby wrote: I see. My move 7 wasn't sente. I don't know why I misread that it was. Anyway, macelee, you're right: these types of posts are interesting, and I'd be happy to see more of them in the future. Well done. Indeed  in Kirby's original answer did not work, as show below: |
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| Author: | macelee [ Sat Sep 26, 2015 3:42 am ] |
| Post subject: | Re: life & death from a pro game |
Now the solution: If whites plays  cut,  cannot be saved because of short of liberty. Note in the previous diagram,  can separate at 'a' too, but that does not affect the end result.
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| Author: | ez4u [ Sat Sep 26, 2015 5:47 am ] |
| Post subject: | Re: life & death from a pro game |
macelee wrote: Now the solution: If whites plays cut, cannot be saved because of short of liberty. Note in the previous diagram, can separate at 'a' too, but that does not affect the end result.Note Mace's point about 'a' in the first diagram above. When Black plays 1 below, White plays 2 as the last trap to test Black's understanding of the position. If Black captures with 3, White has time to descend at 4 and win the fight. Black needs to descend at 'a' instead of 3 and sacrifice 2 stones as necessary to maintain the squeeze on White. |
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