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| Why is white dead? http://www.lifein19x19.com/viewtopic.php?f=11&t=16762 |
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| Author: | Jika [ Fri Jul 12, 2019 3:41 am ] |
| Post subject: | Why is white dead? |
This is another exercise from 321go. Task: Black to play, kill white Accepted solution: Question: Why does this kill white? Seki?? |
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| Author: | Uberdude [ Fri Jul 12, 2019 3:51 am ] |
| Post subject: | Re: Why is white dead? |
leads to black to play in following position |
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| Author: | Shenoute [ Fri Jul 12, 2019 3:53 am ] |
| Post subject: | Re: Why is white dead? |
The last diagram is not a seki because black can play at any of the intersections inside the shape (1-1 and 2-3). Such a move puts the whole white chain in atari, threatening to capture it next move. White's only answer is to capture black three stones but by doing so he only creates a dead shape since it is now black's turn ('Three-in-a-row' if black played the 2-3 point and 'Bent three' if black played the 1-1 point). |
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| Author: | Jika [ Fri Jul 12, 2019 5:20 am ] |
| Post subject: | Re: Why is white dead? |
Ah, sorry, I see! The exercises before were all "win a killing race to save your stones". So I was too focused on keeping my own (black) stones alive. Sacrificing them, I see immediately how this will kill white. I stopped playing this out on a board too early. Obviously. Thank you! |
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| Author: | Kirby [ Fri Jul 12, 2019 6:41 am ] |
| Post subject: | Re: Why is white dead? |
You might find this image, which Bonobo made on SL, a useful reference: These black groups all have the minimum required stones for living. https://senseis.xmp.net/?SmallestGroupWithTwoEyes Kind of just for fun, but it's interesting to think about these small shapes that are alive. |
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