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| Opening problems for AI: Problem 16 http://www.lifein19x19.com/viewtopic.php?f=15&t=17605 |
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| Author: | Bill Spight [ Wed Jul 01, 2020 12:37 pm ] |
| Post subject: | Opening problems for AI: Problem 16 |
Today's problem comes from GoGoD 2009-06-26c, Game 1 of the 34th Gosei final between Yuki Satoshi (W) and Cho U. An earlier position has recently been discussed by John Fairbairn at https://www.lifein19x19.com/viewtopic.php?f=13&t=17600 .  has just invaded the top left corner. Which way does White block? Elf thinks that the difference comes to 21½%.
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| Author: | Bill Spight [ Wed Jul 01, 2020 1:06 pm ] |
| Post subject: | Re: Opening problems for AI: Problem 16 |
| Author: | Harleqin [ Wed Jul 01, 2020 6:06 pm ] |
| Post subject: | Re: Opening problems for AI: Problem 16 |
Maybe the principle is that it is almost always right to choose the variation that properly seals off the invading group. White's strength here is not much less than if he blocked in the other direction, but both the black corner and the black top side is much smaller. |
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| Author: | Bill Spight [ Wed Jul 01, 2020 7:06 pm ] |
| Post subject: | Re: Opening problems for AI: Problem 16 |
Harleqin wrote: Maybe the principle is that it is almost always right to choose the variation that properly seals off the invading group. White's strength here is not much less than if he blocked in the other direction, but both the black corner and the black top side is much smaller. My rule of thumb is to choose the alternative that looks worse for you. 
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| Author: | Uberdude [ Wed Jul 01, 2020 8:53 pm ] |
| Post subject: | Re: Opening problems for AI: Problem 16 |
Huh, if White blocked on the left I thought he was going to double hane to retake the corner territory. I've seen that idea before when black has the top side stone meaning black can extend the cutting stone in sente if you block the right and follow the usual joseki. It's better if the top side stone is closer though, as then it ends up too close to the ponnuki. Suppose White preferred to get sente here. |
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| Author: | Bill Spight [ Wed Jul 01, 2020 11:05 pm ] |
| Post subject: | Re: Opening problems for AI: Problem 16 |
Uberdude wrote: Huh, if White blocked on the left I thought he was going to double hane to retake the corner territory. I've seen that idea before when black has the top side stone meaning black can extend the cutting stone in sente if you block the right and follow the usual joseki. It's better if the top side stone is closer though, as then it ends up too close to the ponnuki. Suppose White preferred to get sente here. Yeah, Elf thinks that line loses 4½%. In the actual game White played the first hane but then extended, losing another 3½%. |
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| Author: | dhu163 [ Fri Jun 04, 2021 10:19 am ] |
| Post subject: | Re: Opening problems for AI: Problem 16 |
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stone. But this way loses 21½% by comparison with the other way, according to Elf, a huge difference.
forces 
and creates aji. After 
protects the Black framework and makes territory.